Zydlewski,J., Letcher, B., O'Donnell, M., Dubreuil, T., and Conner, B. (2007) Movements of brook trout in Stanley Brook, a small coastal stream in Maine. 137th Annual Meeting of the American Fisheries Society. San Francisco, CA. September 2-6.
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September 2007
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Zydlewski, J., and Zydlewski, G. (2021) Where do Maine Atlantic Sturgeon go in the winter? 151st Annual Meeting of the American Fisheries Society. Baltimore, MD. November 6.
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November 2021
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Atlantic Sturgeon of the Gulf of Maine (GOM) are federally listed as threatened because of the lack of information from the region, particularly their annual habitat use patterns. We sought to identify where Atlantic Sturgeon in the GOM go during the winter months (a priority for recovery).
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Zydlewski, J., and Zydlewski, G. (2012) Understanding the migratory fish species of Maine-visions of recovery. Penobscot Fly Fishing Club, Bangor, ME. February 1. INVITED, PRESENTED.
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February 2012
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Synopsis of ongoing regional research by the Coop Unit
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Zydlewski, J., and Stich, D. (2014) Hard choices in assessing survival past dams using telemetry. 2014 Atlantic Salmon and Their Ecosystems Forum, University of Maine, Orono. January 8. PRESENTED.
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January 2014
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Survival analysis at dams using mark recapture can have bias corrected through a "paired release"-but this has the mathematical cost of error inflation. The conditions under which this technique effectively balance bias and error were modeled.
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Zydlewski, J., Zydlewski, G., Gale, W., and Kennedy, B. (2013) Smolting in Coastal Cutthroat Trout. 9th International Smolt Symposium, University of Holar, Iceland. August 15.
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July 2013
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This presentation dealt with nearly ten years of data associated with migrating coastal cutthroat trout in Washington State
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Zydlewski, J., Vogel, S., and Stich, D. (2021) Scaling fish passage assessment; it’s not just a local matter. 151st Annual Meeting of the American Fisheries Society. Baltimore, MD. November 6.
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November 2021
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There is a fundamental mismatch between the estimation of fish survival at a dam and the assessment of dam related impacts on a population.Regardless of challenges, the entire life history may be most appropriate scale of impact analysis to inform decisions.
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Zydlewski, J., Stich, D., and Sigourney, D. (2013) Making the connection between freshwater production and the black box. Meeting of the Marine Estuary Action Team Atlantic salmon framework meeting. Augusta Maine. July 17.
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July 2013
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Critical assessment of known unknowns in salmon restoration
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Zydlewski, J., Stich, D., and Sigourney, D. (2013) Understanding the impacts of dams on up and downstream passage - lessons from Atlantic salmon in the Penobscot River. Oral presentation to the USFWS Craig Brook Fisheries Complex Seminar Series. INVITED, PRESENTED. January 15.
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January 2013
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Summary of 8 years of salmon research in the GOM.
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Zydlewski, J., Stich, D., Roy, S., Sheehan, T., Sprankle, K., Bailey, M. (2022) What have we lost? American shad’s impounded history. 2022 Oregon Chapter of the American Fisheries Society, 58th Annual Meeting. March 2. Virtual.
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March 2022
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To assess the impact of dams, we estimated the historically accessed spawning habitat in coastal rivers (485,618 river segments with 21,113 current dams) based on (i) width, (ii) distance from seawater, and (iii) slope (to exclude natural barriers to migration) combined with local knowledge.<br>Estimated habitat available prior to dam construction (2,752 km<sup>2</sup>) was 41% greater than current fully accessible habitat (1,639 km<sup>2</sup>).
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Zydlewski, J., Schaffler, J., O’Donnell, M., Dubreuil, T., and Letcher, B. (2015) Linking brook trout movement and otolith microchemistry in a coastal Maine system 145th Annual Meeting of the American Fisheries Society. Portland Oregon. August 16-20 INVITED, PRESENTED.
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August 2015
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Brook trout movements were studied in Stanley Brook, a small, oligotrophic, and coastal stream on the southern end of Mount Desert Island, Maine. Otoliths were extracted from these fish for trace element analysis using a high resolution ICP-MS coupled to laser ablation system.
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Zydlewski, J., Santavy, P., Firmenich, A., Kocik, J., and Lipsky, C. (2011) Preliminary results of an imprinting and estuary release stocking method. Maine Conservation and Hatchery Assessment Team Meeting, Craig Brook National Fish Hatchery, East Orland, Maine. June 30. INVITED, PRESENTED.
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June 2011
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Zydlewski, J., Molina-Moctezuma (2018) Understanding fish passage in a changing system- lessons from restoration efforts in the Penobscot River. 2018 Maine Sustainability & Water Conference. March 29. Augusta Civic Center, Augusta, Maine.
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March 2018
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The historic removal of two main-stem dams and building of a nature-like upstream bypass at the next dam upstream (40+ km) in the Penobscot River has fundamentally changed connectivity in this system. we explore challenges we have encountered related to 1) attribution of migratory motivation, 2) handling effects, 3) assumptions of representative sampling 4) the complexity of history-dependent mortality, and 5) influences outside of the river system. We use specific research examples to inform
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Zydlewski, J., Mensinger, M., Molina-Moctezuma, A., Murphy, J., Payne Wynne, M., Peterson, E., Rubenstein, S., and Vogel, S. Fish Passage in a Changing System - How Bioengineering and Policy Are Shaping the Ecology of the Penobscot River. 149th Annual Meeting of the American Fisheries Society. Reno Nevada. September 29.
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September 2019
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The Penobscot River Restoration Project resulted in the recent removal of two main-stem dams and building of a nature-like bypass channel at the next upstream dam. This has fundamentally changed river connectivity and policy challenges.
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Zydlewski, J., McCormick, S., Kunkel, J., Shrimpton, M., Osmoregulation and Migration in American shad; when to go and how they know. Invited Speaker, Wildlife Ecology Seminar Series. January 24, 2005.
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January 2005
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Zydlewski, J., Maynard, G., Molina-Moctezuma, A., Stich, D., and Zydlewski, G. (2018) Understanding fish passage in a changing system- lessons from restoration efforts in the Penobscot River. 74th Annual Northeast Fish & Wildlife Conference. April 15. Burlington, Vermont.
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April 2018
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The historic removal of two main-stem dams and building of a nature-like upstream bypass at the next dam upstream (40+ km) in the Penobscot River has fundamentally changed connectivity in this system. We draw on more than a decade of data collected on shortnose sturgeon, Atlantic salmon, American shad, and American eel where we have assessed species and life-stage specific behaviors and estimated survival of these migratory fishes through the up and downstream gauntlet of obstacles they face.
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Zydlewski, J., Kocik, J., Fernandes, S., and Hawkes, J. (2008) Patterns of movement in striped bass, Morone axatilis in the Penobscot Ribver, Maine. 138th Annual Meeting of the American Fisheries Society. Ottawa, Canada. August 17-21. PRESENTED
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August 2008
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Zydlewski, J., Johnson, J., Clements, S., Karnowski, M., Schreck, C., Zydlewski, G. (2005) Movements of Coastal Cutthroat Trout (Oncorhynchus clarki) in the Lower Columbia River Abstract and Presentation at the Atlantic International Chapter of the American Fisheries Society Annual Meeting, September 19-21, Fairlee, Vermont.
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September 2005
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Zydlewski, J., Izzo, L., and Maynard, G. (2016) The fate of hatchery-spawned Atlantic Salmon released into the Penobscot River, ME. Maine146th Annual Meeting of the American Fisheries Society. Kansas City, MO. August 23.
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August 2016
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Endangered Maine Atlantic Salmon are the focus of restoration efforts including hatchery supplementation using sea-run broodstock. In 2015 we sought to better characterize post-release behavior by surgically radio tagging 56 artificially spawned sea-run adults and tracking them through the following spring.
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Zydlewski, J., Hughes, E., and Cox, O. (2010) Atlantic Salmon in the Penobscot River- Delays, Passage and Visions of Restoration. The 9th International Congress on the Biology of Fishes. Barcelona, Spain, 5-9 July. PRESENTED, INVITED.
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July 2010
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Zydlewski, J., Heres, B., Maynard, G., Molina-Moctezuma, A., Stich, D., and Zydlewski, G. (2017) Understanding fish passage in a changing system- lessons from restoration efforts in the Penobscot River. 147th Annual Meeting of the American Fisheries Society. Tampa, FL. August 20.
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August 2017
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We draw on more than a decade of data collected on shortnose sturgeon, Atlantic salmon, American shad, and American eel where we have assessed species and life-stage specific behaviors and estimated survival of these migratory fishes through the up and downstream gauntlet of obstacles they face.We will also communicate lessons learned through this experience that can be applied to similar efforts in other systems.
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Zydlewski, J., Grote,A., Bailey,M., and Hightower, J. (2013) Penobscot River American shad; who’s here and who cares? Poster presentation to DSSRN, January 10.
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January 2013
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Assessment of American shad presence and movements in the River.
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Zydlewski, J., Firmenich, A., Santavy, P., Lipsky, C., Hawkes, J., Kocik, J. (2012) Assessing the direct stocking of imprinted smolts into the Penobscot River Estuary. 2012 Forum, Atlantic Salmon and their Ecosystems, Bangor Maine January 10-11. PRESENTED.
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January 2012
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Zydlewski, J., Firmenich, A., Kocik, J., Lipsky, C. (2011) Preliminary results of an imprinting and estuary release stocking method. Maine Conservation and Hatechery Assessment Team Meeting, Craig Brook National Fish Hatchery, East Orland, Maine. June 30. INVITED, PRESENTED.
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June 2011
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Zydlewski, J., D. Stich, and D. Sigourney (2012) Understanding impacts of dams on up and downstream passage- lessons from Atlantic salmon in the Penobscot River. Oral presentation at the 142nd Annual Meeting of the American Fisheries Society, Minneapolis-St. Paul, MN.
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August 2012
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Zydlewski, J., C.M. Holbrook, D. Gorsky and M.T. Kinnison (2006) Passage of Adult Atlantic Salmon at the Lower Dams on the Penobscot River. Maine Atlantic Salmon Technical Advisory Committee Meeting. Maine Atlantic Salmon Commission, Bangor, Maine January 17.
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January 2007
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Zydlewski, J., Blomberg, E., and Job, K. (2018) Dam influences on habitat use and migratory survival of American Eel in the Penobscot River, Maine. 148th Annual Meeting of the American Fisheries Society. Atlantic City, New Jersey. August 20.
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August 2018
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In the Penobscot River, Maine, main-stem dams (e.g., West Enfield and Milford Dams; river km 99 and 62) remain sites of American eel passage concern. Dams impede the upstream juvenile migration but successful migrants may face significant life history costs.
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Zydlewski, J., Bailey, M., Roy, S. Sheehan, T. Sprankle, K., Stich, D. (2020) What have we lost? American shad’s impounded history. 150th Annual Meeting of the American Fisheries Society. Columbus, Ohio. August 30.
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August 2020
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Since the early 1800s, dams have greatly reduced access to spawning habitat for American shad. Our model suggests that even with extensive fish passage, dams represent a fixed population constraint of 37 % coastwide.
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Zydlewski, J., Bailey, M. Roy, S., Sheehan, T., Sprankle, K., and Stich, D. (2019) What have we lost? American shad’s impounded history. 149th Annual Meeting of the American Fisheries Society. Reno Nevada. September 29.
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September 2019
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The construction of dams has greatly reduced access to spawning and nursery grounds for American shad, thereby limiting the scope for population growth. To estimate the opportunity cost realized by this species through dam construction, we sought to estimate habitat historically exploited in Atlantic coastal rivers.
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Zydlewski, J., Bailey, M. Roy, S., Sheehan, T., Sprankle, K., and Stich, D. (2019) Influence of Impoundments on American shad recovery. Atlantic States Marine Fishery Commission (webinar). March 24.
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March 2020
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Since the early 1800s, dams have greatly reduced access to spawning habitat by American shad. Our model suggests that even with extensive fish passage, dams represent a fixed population constraint of 37 % coast wide.
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Zydlewski, J. and Stich, D. (2014) Hard Choices in Assessing Survival Past Dams Using Telemetry. 144th Annual Meeting of the American Fisheries Society. Québec City, Canada. August 17-21.
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August 2014
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Mark recapture models are widely used to assess survival of migrating salmon smolts past dams. We modeled an idealized system with a single dam to assess the tradeoff between SE and bias.
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Zydlewski, J. and Basley, D. Movements of Lake Whitefish in Clear Lake, Maine. Presented at the 29th Annual Meeting of the Atlantic International Chapter of the American Fisheries Society, 2005, Rangeley, Maine.
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October 2005
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Zydlewski, J. Sigourney, D and Stich, D. (2014) Hard Choices in Assessing Survival Past Dams Using Telemetry. NOAA National Hydropower Program Meeting. Gloucester, MA. July 9. INVITED, PRESENTED.
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July 2015
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Passage assessment using mark recapture balances precision and accuracy. Tradeoffs for two methods was presented.
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Zydlewski, J. , Zydlewski G., Kennedy, B., and Gale, W. (2011) Smolting in coastal cutthroat trout? 141th Annual Meeting of the American Fisheries Society. Seattle, Washington. September 4-9.INVITED, PRESENTED.
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September 2011
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Zydlewski, J. (2020) The state of passage for Atlantic salmon in the Penobscot River., Penobscot River Salmon Habitat Recovery Unit Meeting. Mitchell Center, University of Maine. Orono, ME. March 12.
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March 2020
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Presented on the state of knowledge for Atlantic salmon fish passage in the Penobscot River. This information contributed to decision-making for identification of regional management priorities.
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Zydlewski, J. (2020) Science for comfort or conservation- how do we inform and avoid action on fish passage? 2019 Atlantic Salmon Ecosystems Forum. January 14. University of Maine, Orono, Maine.
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January 2020
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For more than a decade and a half, I have been part of effective collaborations with NOAA, USFWS, PIN, MDMR, UMO and hydropower companies to inform questions of passage for both adult and juvenile Atlantic salmon in the Penobscot River. Because no amount of research can move the species to recovery without influencing management actions, it is worthwhile to reflect, as a community of stakeholders, on the degree to which some research efforts have been integrated or ignored.
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Zydlewski, J. (2017) Track-2 NEST and Dams: Overview of the New England Sustainability Consortium (NEST) and its Safe Beaches and Shellfish project and the new Future of Dams project. 2017 Maine EPSCoR State Conference, University of Maine, Orono May 23. PRESENTED.
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May 2017
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Project overview for UMaine EPSCOR Project
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Zydlewski, J. (2017) Fish and Dams. USFWS Craig Brook Seminar Series. May 25. INVITED, PRESENTED.
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May 2017
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Presentation on the influence of dams to partners.
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Zydlewski, J. (2017) Fish and Dams. Ontario Ministry of Natural Resources and Forestry, Great Lakes Management Unit Conference, Geneva Park Ramara, Ontario Canada. April 5. INVITED, PRESENTED.
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April 2017
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Presentation considered six ways in which dams may influence fish populations. Examples are drawn from the Penobscot River.
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Zydlewski, J. (2017) Fish and Dams. Maine Association of Wetland Scientists (MAWS) Annual Winter Conference, Bowdoin College, Brunswick, Maine. March 23. INVITED, PRESENTED.
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March 2017
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Presentation considered six ways in which dams may influence fish populations. Examples are drawn from the Penobscot River.
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Zydlewski, J. (2017) Fish and Dams. Bristol Mills Town Meeting, Maine. May 9. INVITED, PRESENTED.
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May 2017
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Presentation to stakeholders on the biological influence of dams .
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Zydlewski, J. (2017) Fish and Dams- Understanding our impounded legacy. Senator George J. Mitchell Center for Sustainability Solutions Lecture Series, University of Maine, Orono Maine. April 3. INVITED, PRESENTED.
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April 2017
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Presentation considered six ways in which dams may influence fish populations. Examples are drawn from the Penobscot River.
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Zydlewski, J. (2016) Restoration of Migratory Fish to the Penobscot River Maine Chapter of the Appalachian Mountain Club Seminar Series, Fields Pond Audubon Center, Orrington ME, April 14.
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April 2016
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Presentation is the synopsis of field work on the Penobscot River before and after dam removals. Patterns of passage at dams are considered.
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Zydlewski, J. (2016) Fish and Dams. UNH American Fisheries Society Seminar Series. University of New Hampshire, Durham, NH. November 28. INVITED, PRESENTED
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November 2016
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Presentation considered six ways in which dams may influence fish populations. Examples are drawn from the Penobscot River.
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Zydlewski, J. (2016) Fish and Dams. St. John River Watershed International Cross-Boundary Riverside Resort and Conference Centre, Fredericton, New Brunswick, Canada (via webinar). November 1. INVITED, PRESENTED.
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November 2016
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Presentation considered six ways in which dams may influence fish populations. Examples are drawn from the Penobscot River.
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Zydlewski, J. (2015) Structured Decision Making – applications and for management. University of Maine American Fisheries Society Sub-Unit, University of Maine, Orono. January 27. INVITED
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January 2015
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Discussed the application of SDM in fisheries management
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Zydlewski, J. (2013) Restoration of the Penobscot River- facts, fish and fantasy. University of New Brunswick Biology Seminar Series. INVITED, PRESENTED. November 22.
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November 2013
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This presentation will consider the changes on the Penobscot River as the Penobscot River Restoration Project continues. These changes will likely affect different migratory fishes and their life history stages in different ways.
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Zydlewski, J. (2009) Migration studies in the Penobscot River. Veazie Salmon Club. January 22. INVITED, PRESENTED
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January 2009
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Zydlewski, J. (2008) Sea-run brook trout and striped bass- characterizing connectivity with the sea. Maine Sea Grant Policy Advisory Committee. June 5. INVITED, PRESENTED.
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June 2008
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Zydlewski, J. (2012) Migratory fish in the Penobscot River. Veazie Salmon Club, Veazie, ME. April 5. INVITED, PRESENTED.
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April 2012
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Zydlewski, J, Johnson J, Zydlewski, G (2005) Cutthroat trout (Oncorhynchus clarki) in the Lower Columbia River: migration and residency Presented at the Coastal Cutthroat Trout Symposium: Biology, Status, Management, and Conservation 2005; Fort Worden State Park, Washington
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October 2005
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Zydlewski, J, Johnson J, Hogle,J, Brunzell, J, Clements, S, Karnowski, M, Schreck, C. Seaward migration of coastal cutthroat trout (Oncorhynchus clarki) from four tributaries of the Columbia River. Presented at the Coastal Cutthroat Trout Symposium: Biology, Status, Management, and Conservation 2005; Fort Worden State Park, Washington
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October 2005
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Zydlewski, J and Coghlan, S (2012) Fisheries Science at the University of Maine. Oral presentation to Maine Department of Inland Fisheries Commissioner. INVITED, PRESENTED, December 3.
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December 2012
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Provided commissioner an assessment of current and future fisheries research needs.
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Zydlewski, G.B., Kinnison, M.T., Dionne, P., Wegener, M., Zydlewski, J., Wippelhauser, G.S. (2010) Understanding Habitat Connectivity For Shortnose Sturgeon: From Ocean To Historic Freshwater Habitat In Maine. The 9th International Congress on the Biology of Fishes. Barcelona, Spain, 5-9 Jul. INVITED.
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July 2010
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Zydlewski, G., Kinnison, M., Zydlewski, J., Fernandes, S., Dionne, P., Lipsky, C., Kocik, J., Wippelhauser, G. (2008) Assessment of endangered shortnose sturgeon in Maine Rivers ICES Annual Meeting, Halifax, Nova Scotia. September 24. INVITED.
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September 2008
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Zydlewski, G., J. Zydlewski and S. Lashua (2008) Long-term seawater performance and scale circuli deposition of Atlantic salmon smolts. Atlantic Salmon Research Forum. Orono, ME. January 8.
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January 2008
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Zydlewski, G. and Zydlewski, J. (2009) Long-term Seawater performance of Atlantic salmon smolts. International Smolt Workshop, Corvallis Oregon August 25. PRESENTED, INVITED
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August 2009
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Zydlewski, G. and Zydlewski, J. (2008) Long-term Seawater performance of Atlantic salmon smolts. 138th Annual Meeting of the American Fisheries Society. Ottawa, Canada. August 17-21. INVITED.
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August 2008
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Zydlewski, G. B. M. T. Kinnison, S. Fernandes, P. Dionne, J. D. Zydlewski, T.L. King, C. Lipsky, J. Kocik, G. S. Wippelhauser. (2008) Assessment of endangered shortnose sturgeon in Maine Rivers, International Council for the Exploration of the Sea Annual Science Conference, Halifax, NS; Symposium: Problems and solutions for the assessment, conservation, and restoration of rare, threatened, and endangered fish species 22 - 26 September INVITED.
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January 2008
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Zydlewski, G, Zydlewski, J and Danner,R (2005) Does descaling impair osmoregulation in seawater challenged Atlantic salmon smolts? Presented at the 29th Annual Meeting of the Atlantic International Chapter of the American Fisheries Society, 2005, Rangeley, Maine.
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October 2005
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Zydlewski , J. and Barber, B. (2016) Connectivity, aquatic communities and climate change . International St. Croix River Watershed Board Meeting, Public Meeting. Calais, Maine June 14.
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June 2016
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Presented data on connectivity, aquatic communities and climate change. Implications for the St Croix River were considered.
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Zydewski, J., Kocik, J., Fernandes, S. and Hawkes, J. (2009) Patterns of movement in striped bass in the Penobscot River, Maine. 139th Annual Meeting of the American Fisheries Society. Nashville Tennessee. August 30-September 3. PRESENTED.
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September 2009
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Zydewski, J., Kocik, J., Fernandes, S. and Hawkes, J. (2009) Patterns of movement in striped bass in the Penobscot River, Maine. 139th Annual Meeting of the American Fisheries Society. Nashville Tennessee. August 30-September 3. PRESENTED.
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August 2009
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Zydewski, J (2009) Recovery of the Penobscot River. Veazie Salmon Club. November 19. PRESENTED, INVITED
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November 2009
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Zydewski, J and Bailey, M. (2010) American shad in the Penobscot River – choosing management tools. Atlantic Salmon Research Forum. Orono, ME. January 6. PRESENTED, INVITED.
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January 2010
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Zydewski, J and Bailey, M. (2010) American shad in the Penobscot River – choosing management tools. The Nature Conservancy, Augusta Maine. January 12. PRESENTED, INVITED
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January 2010
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Zydewski, J (2010) Fitting technology to the question- a tale to tagging and tracking. University of Vermont. January 13. PRESENTED, INVITED.
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January 2010
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Zydewski, J (2009) Cooperative projects in the Penobscot River NOAA Restoration work in the presentation. Portland Maine, September 16. PRESENTED, INVITED.
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September 2009
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Zenga, A., Peterson, E., and Zydlewski, J. (2020) Alewife Energetics and its Possible Implications on Fitness2019 Atlantic Salmon Ecosystems Forum. January 14. University of Maine, Orono, Maine.
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January 2020
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Alewife are a commercially and economically important fish, that expend large amounts of energy during their long migrations to spawning habitat. To better understand how energy use affects fitness in alewife, we captured and sampled fish from the over the course of their spawning migration.
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Wilson, C., Kocik, J., and Zydlewski, J. (2021) Assessing the Ability of ARC800 Sensor Fish to Describe Physical Stressors Experienced by Migrating Fish. 151st Annual Meeting of the American Fisheries Society. Baltimore, MD. November 6.
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November 2021
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Coastal rivers in the Gulf of Maine harbor a suite of migratory fishes that migrate between rivers and the ocean as juveniles and adults. Our goal was to assess the ARC800 Sensor Fish’s ability to quantify the impacts dams have on fish as they migrate downstream through dam fish ways and turbines.
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Wilbur, L., Coghlan, Jr., S. and Zydlewski, J. (2021) Assessing the distribution and abundance of Bridle Shiners in Maine. 151st Annual Meeting of the American Fisheries Society. Baltimore, MD. November 6.
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November 2021
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Bridle shiners (<i>Notropis bifrenatus</i>) are one of Maine’s native species of freshwater minnow and are listed as a <i>Species of Special Concern</i> in the State. This project will inform the Maine Department of Inland Fisheries & Wildlife on the status of this species and will provide a foundation for future long-term monitoring of extant bridle shiner populations in the state.
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Whittum, K., Zydlewski, J., Coghlan Jr., S., Cruz-Uribe, A. (2021) An assessment of age, growth, and otolith chemistry for White Catfish in the Penobscot River, Maine. 151st Annual Meeting of the American Fisheries Society. Baltimore, MD. November 6.
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November 2021
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White Catfish populations are declining in their native range but in coastal rivers in the northeast Atlantic coast, the relative abundance of this species is increasing. The tolerance of this species to moderate salinity, growing presence in the lower Penobscot River and frequent observation at the Milford Dam paint a likely picture of establishing a prominent presence upriver.
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Whittum, K., Coghlan, Jr., S., Hayes, D., Zydlewski, J., Kiraly, I., Watson, J. (2020) Fish assemblage response to Dam removal on the Penobscot River, Maine. Atlantic International Chapter of the American Fisheries Society, Virtual Meeting. August 25.
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August 2020
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Fish assemblages in the Penobscot River were assessed before and after dam removal on the Penobscot River, Maine. Patterns of migratory fish recovery were presented.
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Whittum, K., Coghlan Jr., S., Zydlewski, J., Hayes, D., Kiraly, I., and Watson, J. (2020) Changes in fish assemblages following main stem dam removals in the Penobscot River, Maine. 150th Annual Meeting of the American Fisheries Society. Columbus, Ohio. August 30.
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August 2020
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In Maine, the Penobscot River Restoration Project removed the two lowermost dams on the river and improved fish passage at other dams to help recover declining sea-run fishes and increase resilience of entire ecosystems. To quantify spatial and temporal changes associated with river rehabilitation efforts, fish assemblages were assessed using boat electrofishing surveys (three years each, spring and autumn) prior to dam removal, shortly after removal, and six years post removal (in progress).
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Whittum, K., Coghlan Jr., S., Zydlewski, J., and Hayes, D. (2020) Fish community assessment six years following dam removal in the Penobscot River, Maine. 2019 Atlantic Salmon Ecosystems Forum. January 14. University of Maine, Orono, Maine.
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January 2020
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Removing dams and their impoundments fundamentally changes flow regimes and increases connectivity, with profound effects on fish assemblages. To quantify spatial and temporal changes associated with river rehabilitation efforts, fish assemblage monitoring via boat electrofishinghas been conducted.
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Whittum, K., Coghlan Jr., S., Zydlewski, J., Hayes, D. (2020) White catfish are accessing new habitat in the Penobscot River, Maine, following dam removals. 150th Annual Meeting of the American Fisheries Society. Columbus, Ohio. August 30.
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August 2020
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Captured fish, as well as fish removed at Milford Dam, will provide demographic and growth data to better understand this species within the Penobscot River. Preliminary aging via otoliths indicates those fish intercepted in the Milford fishway are older individuals (median 6), range (5-9) that are relatively large (250-425 mm).
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Whittum, K., Zydlewski, J., Coghlan Jr., S., and Hayes, D. (2022) Long term biomonitoring of fish assemblages following large scale habitat restoration efforts in the Penobscot River, Maine. 2022 Atlantic Salmon Ecosystems Forum. January 11. University of Maine, Orono, Maine.
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January 2022
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The Penobscot River Restoration Project is one of the largest ever completed river rehabilitation projects, culminating in the removal of the two lowermost dams on river and improvements to fish passage on several remaining dams. To quantify spatial and temporal changes associated with river rehabilitation efforts, fish assemblages were surveyed for 3 years prior to dam removal, 3 years after, and now 8 years post dam removal.
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Whitaker, D., Hawkes, J., Zydlewski, J., and Sheehan, T. (2016) Do we hit to the target? Evaluation of thermal exposure of river- and hatchery-reared juvenile Atlantic salmon prior to migration on the Narraguagus River, Maine U.S.A. 2016 Atlantic Salmon Ecosystems Forum. January 6-7. University of Maine, Orono, Maine.
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January 2016
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U.S. Atlantic salmon are at critically low abundance, with remnant populations listed as endangered under the Endangered Species Act. Extensive hatchery supplementation has been used to meet recovery objectives. Unlike naturally–reared fish, the migratory timing of hatchery smolts is limited by stocking date. Our data suggest that some of these fish may have missed their developmental “smolt window” which has been demonstrated to decrease survival during seawater entry.
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Weedop, D., Romer, J., Ziller, J. and Murphy, C.A. 2022. Are Mountain Whitefish sentinels of change? Oregon Chapter of the American Fisheries Society Annual Meeting (virtual).
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March 2022
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We compiled 20 years of upstream passage data, comparing timing among species. We found Mountain Whitefish declined dramatically over the period of study. Our findings suggest that additional studies on Mountain Whitefish populations in Oregon may be important to understanding current and future trends of this native and ecologically relevant species.
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Weedop, D., Murphy, C.A. 2022. Community Interactions Within Acadia National Park’s Freshwater Food Webs. Poster presentation to the American Fisheries Society Annual Meeting. Spokane, WA.
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August 2022
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Food webs can reveal how fish assemblages, including introduced fishes, impact the niches of individual fish species. To investigate potential interactions within Acadia National Park lakes, carbon and nitrogen stable isotopes are being collected from multiple trophic levels in five lentic systems, with a focus on sampling the fish community, prey, and basal resources.
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Weaver, D.M., Coghlan Jr., S.M, and Zydlewski, J. (2018) “Closing the Loop”: Anadromous sea lamprey carcasses influence larval conspecifics2017 Atlantic Salmon Ecosystems Forum. January 17. University of Maine, Orono, Maine.
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January 2018
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Previous work has demonstrated that carcass nutrients increase stream productivity and are incorporated by pre-metamorphic larvae. We examined the sensitivity of life history parameters and influence of sea lamprey carcass nutrients on the age and growth of larval conspecifics with a deterministic stock recruitment model.
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Weaver, D.M., Coghlan Jr., S.M, and Zydlewski, J. (2018) “Closing the Loop”: Anadromous sea lamprey carcasses influence larval conspecifics. New York Chapter of the American Fisheries Society Annual Meeting. February 7. Cooperstown, New York at the Otesaga Resort Hotel.
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February 2018
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Spawning migrations of sea lamprey may serve as vectors of nutrients to freshwater food webs via decomposing carcasses. We examined the sensitivity of life history parameters and influence of carcass nutrients on the age and growth of larval conspecifics with a deterministic stock recruitment model.
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Weaver, D., Sigourney, D., and Zydlewski, J. (2020) Forecasting the upstream movement of adult Atlantic salmon. Atlantic International Chapter of the American Fisheries Society, Virtual Meeting. August 25.
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August 2020
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The timing of migration in fish species is linked to seasonal changes in environmental conditions. We presented a model to forecast eel migration.
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Weaver, D., Sigourney, D., Vallee, D., and Zydlewski, J. (2020) A forecasting tool for downstream migrating adult American Eels. 150th Annual Meeting of the American Fisheries Society. Columbus, Ohio. August 30.
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August 2020
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During downstream migration, American eel face substantial injury and mortality passing through hydroelectric facilities.<br>We constructed an auto-regressive integrated moving average (ARIMA) model that uses historical eel catch data, environmental relationships, and real-time environmental data to forecast silver eel movement.
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Weaver, D., Sigourney, D., Delucia, M., and Zydlewski, J. (2020) Forecasting the downstream migration of adult silver phase American eels. 2019 Atlantic Salmon Ecosystems Forum.January 14. University of Maine, Orono, Maine.
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January 2020
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Beginning in late summer, silver phase eels migrate from freshwater systems out to the Sargasso Sea to spawn. Improved predictions as to the timing and magnitude of eel migrations may inform mitigation actions (e.g., operational shutdowns) to reduce injury and mortality.
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Weaver, D., Sigourney, D., Delucia, M., and Zydlewski, J. (2019) Forecasting the downstream migration of adult silver phase American eels. 149th Annual Meeting of the American Fisheries Society. Reno Nevada. September 29.
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September 2019
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Improved predictions as to the timing and magnitude of eel migrations may inform mitigation actions (e.g., operational shutdowns) to reduce injury and mortality. This work represents a step towards the development of an auto-regressive integrated moving average (ARIMA) forecasting model to predict silver eel movement using forecasted environmental covariates.
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Weaver, D., Coghlan, S., and Zydlewski, J. (2014) Anadromous sea lamprey (Petromyzon marinus) as vectors of marine-derived nutrients: implications for dam removal and Atlantic salmon restoration. 2014 Atlantic Salmon and Their Ecosystems Forum, University of Maine, Orono. January 8.
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January 2014
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The introduction of sea lamprey carcasses has been hypothesized to supplement freshwater communities, but this has not been explicitly evaluated. This work presents data on the influence of carcass input on water chemistry and primary productivity.
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Weaver, D., Coghlan, Jr., S., and Zydlewski, J. (2015) Anadromous Sea Lamprey Influence Stream Food Webs in an Atlantic Coastal Stream145th Annual Meeting of the American Fisheries Society. Portland Oregon. August 16-20 INVITED.
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August 2015
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The role of Sea Lamprey Petromyzon marinus in Atlantic coastal systems is poorly understood. We examined the spatial and temporal dynamics of nutrients from carcasses and influences on primary productivity using nutrient diffusing substrates and assimilation by juvenile Sea Lamprey (ammocoetes), macroinvertebrates, and freshwater mussels using stable isotopes analysis (δ15N and δ13C).
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Weaver, D., Coghlan, Jr., S. and Zydlewski, J. (2015) Anadromous sea lamprey influence stream nutrients and primary productivity. 1st Annual University of Maine Freshwater Science Symposium, University of Maine, Orono. January 29.
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January 2015
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Sea lamprey spawn and die in nutrient poor streams. This nutrient addition in the spring may be critical for fish and invertebrate communities.
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Weaver, D., Coghlan Jr., S., and Zydlewski, J. (2017)Sea Lamprey as a Functional Link between Freshwater and Marine Ecosystems Annual meeting of the Maine Cooperative Fish and Wildlife Research Unit, University of Maine, Orono. March 22.
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March 2017
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Historically, freshwater systems were linked to the marine environment by spawning migrations of adult anadromous fishes and subsequent seaward migration of juveniles. . Our findings provide quantitative results as to the ecological role of anadromous Sea Lamprey and underscore the importance of freshwater-marine connectivity to Atlantic coastal streams.
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Weaver, D., Coghlan Jr., S., and Zydlewski, J. (2017) “Closing the Loop”: Anadromous sea lamprey carcasses influence larval conspecifics. 147th Annual Meeting of the American Fisheries Society. Tampa, FL. August 20.
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August 2017
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Spring spawning migrations of anadromous Sea Lamprey Petromyzon marinus occur in Atlantic coastal rivers. Our work demonstrated that nutrient supplementation by conspecifics may increase the overall scope for population growth.
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Weaver, D., Coghlan Jr., S., and Zydlewski, J. (2016) Sea Lamprey Carcasses Influence Food Webs in an Atlantic Coastal Stream. Annual meeting of the Maine Cooperative Fish and Wildlife Research Unit, University of Maine, Orono. March 23.
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March 2016
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Anadromous Sea Lamprey Petromyzon marinus deliver a pulsed nutrient subsidy to Atlantic coastal waters during the spring. We conducted sea lamprey carcass addition experiments to quantify the autotrophic and heterotrophic responses of stream food webs.
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Weaver, D., Coghlan Jr., S., and Zydlewski, J. (2016) Sea Lamprey Carcasses Influence Food Webs in an Atlantic Coastal Stream. 2016 Atlantic Salmon Ecosystems Forum. January 6-7. University of Maine, Orono, Maine.
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January 2016
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We conducted sea lamprey carcass addition experiments to quantify the autotrophic and heterotrophic responses of small stream food webs. We found increases in primary productivity immediately adjacent to carcasses but we did not detect broader spatial changes in productivity downstream of a gradient of increasing subsidies.
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Weaver, D., Coghlan Jr., S., Perkins, B., and Zydlewski, J. (2016) Anadromous Sea Lamprey Influence Food Web Pathways in an Atlantic Coastal Stream Maine146th Annual Meeting of the American Fisheries Society. Kansas City, MO. August 23.
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August 2016
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Anadromous Sea Lamprey Petromyzon marinus deliver a pulsed nutrient subsidy to Atlantic coastal waters during the spring. We conducted sea lamprey carcass addition experiments to quantify the autotrophic and heterotrophic responses of stream food webs.
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Weaver, D., Brown, M., and Zydlewski, J. (2019) Where there’s a Will, but not a Way: Behavior of American Shad Approaching the Brunswick Dam Fishway on the Androscoggin River, Maine. 2019 Maine Sustainability and Water Conference, Augusta, Maine. March 28.
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March 2019
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Brunswick Dam impedes fish passage in the Androscoggin River at the head of tide and blocks approximately 32 km of spawning habitat for American shad. We analyzed video and telemetry data collected by the Maine Department of Marine Resources from 2002-2005 to evaluate American shad behavior approaching the fishway relative to hydropower turbine operations.
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Weaver, D., Brown, M., and Zydlewski, J. (2019) Where there’s a Will, but not a Way: Behavior of American Shad Approaching the Brunswick Dam Fishway on the Androscoggin River, Maine. 2019 Coordinating Committee Meeting of the U.S. Geological Survey, Maine Cooperative Fish and Wildlife Research Unit. Orono, ME. March 26. (Poster)
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March 2019
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American shad are present in high numbers below the Brunswick Dam Maine, yet they are rarely passed upstream. We present telemetry and video data to better understand this poor fishway performance.
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Weaver, D., Brown, M., and Zydlewski, J. (2018) Behavior of American Shad Approaching the Brunswick Dam Fishway on the Androscoggin River, Maine. 148th Annual Meeting of the American Fisheries Society. Atlantic City, New Jersey. August 20.
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August 2018
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Brunswick Dam, at the head of tide, impedes fish passage in the Androscoggin River and blocks approximately 32 km of spawning habitat for American shad. To inform passage improvements, a radio telemetry study was conducted from 2002–2005 to characterize American Shad behavior near the vertical slot fishway.
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Weaver, D. Coghlan, S., and Zydlewski, J. (2014) Effects of anadromous Sea Lamprey as vectors of marine-derived nutrients in freshwater ecosystems. 144th Annual Meeting of the American Fisheries Society. Québec City, Canada. August 17-21.
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August 2014
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Many anadromous fish populations have declined due to migration barriers, habitat loss, and overfishing, reducing or eliminating nutrient subsidies. We examined the nutrient dynamics of semelparous Sea Lamprey Petromyzon marinus carcasses.
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Watson, J., Coghlan, Jr.,S., Zydlewski, J., Hayes, D., and Kiraly, I. (2015) Fish Community Changes Associated With Dam Removal in the Penobscot River, Maine. Annual meeting of the Maine Cooperative Fish and Wildlife Research Unit, University of Maine, Orono. March 25.
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March 2015
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Changes in fish communities pre and post dam removal were assessed. Timelines and implications were considered.
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Watson, J., Coghlan, Jr., S., Zydlewski, J., and Hayes, D. (2016) Recovery of river herring Alosa spp. influences smallmouth bass Micropterus dolomieu diet and growth in the Penobscot River, Maine. Maine146th Annual Meeting of the American Fisheries Society. Kansas City, MO. August 23.
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August 2016
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Restoration efforts on the Penobscot River (Maine, USA) include the removal of the two lower-most dams and improvements to fish passage at remaining barriers. We collected smallmouth bass, via angling and electrofishing, from May – October 2015 in the Penobscot River watershed to determine the seasonal prevalence of river herrings in stomach contents.
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Watson, J., Coghlan, Jr., S., Zydlewski, J., Hayes, D., and Kiraly, I. (2015) Fish Community Changes Associated With Dam Removal in the Penobscot River, Maine. The University of Maine Graduate Research Exposition. Orono, ME.
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April 2015
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Fish community changes in response to dam removal were described. Implications for anadromous fish recovery were considered.
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Watson, J., Coghlan, Jr., S., Zydlewski, J., Hayes, D., and Kiraly, I. (2015) Fish Community Changes Associated With Dam Removal in the Penobscot River, Maine. 1st Annual University of Maine Freshwater Science Symposium, University of Maine, Orono. January 29.
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January 2015
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The Penobscot River has had two major dams removed. Electrofishing data was presented to characterize shifts in communities.
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Watson, J., Coghlan, Jr., S., Zydlewski, J., Hayes, D., and Kiraly, I. (2015) Dam removal and fish passage improvement influence fish assemblages in the Penobscot River, Maine 145th Annual Meeting of the American Fisheries Society. Portland Oregon. August 16-20 INVITED.
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August 2015
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Removal of dams is assumed to reestablish species distributions and abundance, but this is infrequently tested.We assessed fish assemblages of the Penobscot River, Maine before (2010-2012) and after dam removal (2014) using boat electrofishing surveys and a stratified-random sampling design.
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Watson, J., Coghlan, Jr., S., Zydlewski, J., Hayes, D. and Kiraly, I. (2016) Dam removal and fish passage improvement influence fish assemblages in the Penobscot River, Maine. Penobscot Watershed Conference, Northport, Maine. April 8.
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April 2016
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Diadromous fish restoration actions on the Penobscot River (Maine, USA) include the removal of the two lower-most dams and represent one of the most significant conservation efforts in the United States. We assessed fish assemblages before (2010-2012) and after (2014-2015) river modifications using boat electrofishing surveys and a stratified-random sampling design.
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Watson, J., Coghlan, Jr., S., Zydlewski, J., Hayes, D. and Kiraly, I. (2016) Dam removal and fish passage improvement influence fish assemblages in the Penobscot River, Maine. Maine146th Annual Meeting of the American Fisheries Society. Kansas City, MO. August 23.
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August 2016
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Diadromous fish restoration actions on the Penobscot River (Maine, USA) include the removal of the two lower-most dams and represent one of the most significant conservation efforts in the United States. We assessed fish assemblages before (2010-2012) and after (2014-2015) river modifications using boat electrofishing surveys and a stratified-random sampling design.
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Watson, J., Coghlan, Jr., S., Zydlewski, J., Hayes, D. and Kiraly, I. (2016) Dam removal and fish passage improvement influence fish assemblages in the Penobscot River, Maine. Annual meeting of the Maine Cooperative Fish and Wildlife Research Unit, University of Maine, Orono. March 23.
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March 2016
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Diadromous fish restoration actions on the Penobscot River (Maine, USA) include the removal of the two lower-most dams and represent one of the most significant conservation efforts in the United States. We assessed fish assemblages before (2010-2012) and after (2014-2015) river modifications using boat electrofishing surveys and a stratified-random sampling design.
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Watson, J., Coghlan, Jr., S., Zydlewski, J., Hayes, D. and Kiraly, I. (2016) Dam removal and fish passage improvement influence fish assemblages in the Penobscot River, Maine. 2016 Atlantic Salmon Ecosystems Forum. January 6-7. University of Maine, Orono, Maine.
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January 2016
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The two lower-most dams, Great Works and Veazie, were removed from the Penobscot River, Maine in 2012 and 2013, respectively. We assessed fish assemblages in the main-stem river and several major tributaries before (2010-2012) and after dam removal (2014-2015) using boat electrofishing surveys, employing a stratified-random sampling design.
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Watson, J. , Coghlan Jr., S.,Hayes, D., Kiraly, I., and Zydlewski, J. (2017)Dam Removal and Fish Passage Improvement Influence Fish Assemblages in the Penobscot River, Maine Annual meeting of the Maine Cooperative Fish and Wildlife Research Unit, University of Maine, Orono. March 22.
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March 2017
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Restoration efforts on the Penobscot River (Maine, USA) are among the largest currently underway in the United States, and include the removal of the two lower-most dams and improvements to fish passage at remaining barriers. We assessed fish assemblages of the Penobscot River, Maine before (2010-2012) and after dam removal (2014) using boat electrofishing surveys and a stratified-random sampling design.
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Wathen, R.., Coghlan, S. and Zydlewski, J. (2008) Competition between Atlantic salmon smolts and smallmouth bass; experiments in an artificial stream 138th Annual Meeting of the American Fisheries Society. Ottawa, Canada. August 17-21
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August 2008
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Wathen, R., Zydlewski, J., Coghlan, S., and Jackson, C. (2007) Construction of an artificial stream to assess interactions between smallmouth bass and salmonids. 137th Annual Meeting of the American Fisheries Society. San Francisco, CA. September 2-6.
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September 2007
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Wathen, G., Zydlewski, J., Coghlan, S., and Trial, J. (2009) Do invasive smallmouth bass compete with native Atlantic salmon for habitat? Atlantic International Chapter of the American Fisheries Society. Shelburne New Hampshire, September 20-22.
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September 2009
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Wathen, G., Zydlewski, J., Coghlan, S., and Trial, J. (2009) Do invasive smallmouth bass compete with native Atlantic salmon for habitat? 139th Annual Meeting of the American Fisheries Society. Nashville Tennessee. August 30-September 3.
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September 2009
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Wathen, G. Zydlewski, J., Coghlan, S., and Trial, J. (2009) Do invasive smallmouth bass compete with native Atlantic salmon for habitat? The Diadromous Species Restoration Research Network Science Meeting - Restoration of Diadromous Fishes and Their Ecosystems: Confluence of Science and Restoration. University of Maine, Orono, Maine. July 22-24.
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July 2009
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Vogel, S.K., Loftin, C., Zydlewski, J.D. Investigating the scientific networks of the Maine CRU. [poster] Maine Cooperative Fish and Wildlife Research Unit Annual Meeting. July 12, 2022. Orono, ME.
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July 2023
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The U.S. Geological Survey’s (USGS) Cooperative Fish and Wildlife Research Units (CRU) program establishes relationships among the USGS, U.S. Fish and Wildlife Service, Wildlife Management Institute, host universities, and state resource agencies. This research focuses on analyzing Unit scientist impacts and outputs by assessing the collaborative networks of the Units and the production of scientific publications as one measure of impact.
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Vogel, S.K., Loftin, C., Zydlewski, J.D. A (very) brief history of the Cooperative Research Units Program. [oral, invited keynote] Maine Cooperative Fish and Wildlife Research Unit Annual Meeting. July 12, 2022. Orono, ME.
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July 2023
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The U.S. Geological Survey’s (USGS) Cooperative Fish and Wildlife Research Units (CRU) program establishes relationships among the USGS, U.S. Fish and Wildlife Service, Wildlife Management Institute, host universities, and state resource agencies. This research focuses on analyzing Unit scientist impacts and outputs by assessing the collaborative networks of the Units and the production of scientific publications as one measure of impact.
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Vogel, S., Smith, S., and Zydlewski, J. (2020) Does habitat go with the flow? Sea-run fish habitat in the Penobscot River over the last century. 150th Annual Meeting of the American Fisheries Society. Columbus, Ohio. August 30.
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August 2020
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Dams have been implicated in the declines in sea-run fish (e.g., Atlantic salmon, river herring, American shad, sea lamprey and two sturgeon species) through fragmentation, but the degree to which changes in seasonal flow regimes may influence population abundance through habitat impact has been less explored. We characterized the flow duration curves for the Penobscot River from 1903-present using USGS gauge station data, and identified the timing of influence imposed by dams and other alterat
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Vogel, S., Smith, S., and Zydlewski, J. (2020) Modeling flow in Penobscot River pre and post dam removal. Atlantic International Chapter of the American Fisheries Society, Virtual Meeting. August 25.
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August 2020
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Historic changes in fluvial geomorphology can change the available habitat for fish species. We assessed changes in the Penobscot River over the last 200 years.
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Vogel, S., Loftin, C., and Zydlewski, J. 2021 A collaborative organizational network analysis of the Cooperative Research Units program. 151st Annual Meeting of the American Fisheries Society. Baltimore, MD. November 6.
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November 2021
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The U.S. Geological Survey's Cooperative Fish and Wildlife Research Units Program (CRU) establishes a relationship among the U.S. Geological Survey (USGS), U.S. Fish and Wildlife Service (USFWS), Wildlife Management Institute (WMI), a host university, and state resource agencies.The goal is to elucidate how organizational factors may contribute to each cooperator network, how the networks have evolved, and how factors may influence future conditions of individual units and the CRU Program in ge
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Vogel, S., Loftin, C., and Zydlewski, J. (2022) Collaboration networks within the CRU program. 152st Annual Meeting of the American Fisheries Society. Spokane, WA.
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August 2022
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The U.S. Geological Survey’s (USGS) Cooperative Fish and Wildlife Research Units (CRU) program establishes relationships among the USGS, U.S. Fish and Wildlife Service, Wildlife Management Institute, host universities, and state resource agencies. This research focuses on analyzing Unit scientist impacts and outputs by assessing the collaborative networks of the Unitis and the production of scientific publications as one measure of impact.
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Vogel, S., Loftin, C., and Zydlewski, J. (2022) A Collaborative Organizational Network Analysis of the Cooperative Research Units Program. 2022 Atlantic Salmon Ecosystems Forum. January 11. University of Maine, Orono, Maine.
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January 2022
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The U.S. Geological Survey's Cooperative Fish and Wildlife Research Units Program (CRU) establishes a relationship among the U.S. Geological Survey (USGS), U.S. Fish and Wildlife Service (USFWS), Wildlife Management Institute (WMI), a host university, and state resource agencies. We are evaluating the program's structure and socio-technical connectivity to identify motivations, relationships, and layered networks among members and their relationships to outcomes through an Organizational Networ
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Vogel, S., Loftin, C., and Zydlewski, J. (2024) Charting collaborative waters: Network dynamics of the USGS CRU program. Charting collaborative waters: Network dynamics of the USGS CRU program. 154th Annual Meeting of American Fisheries Society, Honolulu, Hawai’i. September 15.
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September 2024
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The CRU program is intended to meet the information needs of managers. Our research utilized a survey and an analysis of CRU publications to evaluate the program's potential in bridging the “knowledge-action gap”.
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Vogel, S., Loftin, C., and Zydlewski, J. (2022) Collaboration networks within the CRU program. The Atlantic International Chapter of the American Fisheries Society. Newry, Maine. September 18.
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September 2022
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Collaboration networks within the CRU program.
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Vogel, S., Jansujwicz, J., and Zydlewski, J. (2020) Fish passage decision-making during hydropower relicensing in the Kennebec and Penobscot Rivers, Maine2019 Atlantic Salmon Ecosystems Forum. January 14. University of Maine, Orono, Maine.
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January 2020
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The Federal Energy Regulatory Commission (FERC) regulates most hydropower dams and grants 30-50 year licenses to projects and typically include conditions for the conservation of sea-run fish (e.g., fish passage construction, operation changes, monitoring, and other mitigative conditions). Using the Kennebec and Penobscot Rivers as a model system, we sought to identify the main factors that influence fish passage decision-making and describe patterns of stakeholder engagement in licensing from
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Vogel, S., Jansujwicz, J., and Zydlewski, J. (2019) What does “best available science” mean in the FERC hydropower relicensing process? 2019 Maine Sustainability and Water Conference, Augusta, Maine. March 28.
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March 2019
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Making informed decisions about hydropower operations and management during FERC relicensing requires the production and use of science. Official relicensing documents were analyzed, to enhance our understanding of how agency stakeholders define “best available science”.
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Vogel, S., Jansujwicz, J., and Zydlewski, J. (2019) What does “best available science” mean in the FERC hydropower relicensing process? 2019 Coordinating Committee Meeting of the U.S. Geological Survey, Maine Cooperative Fish and Wildlife Research Unit. Orono, ME. March 26. (Poster)
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March 2019
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FERC decisions for dam re licensing are infrequent, yet quite influential. We explore how science is used in this process.
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Vogel, S., Jansujwicz, J., and Zydlewski, J. (2019) Science in Action or Science Inaction: The Use of Best Available Science in The FERC Hydropower Relicensing Process 149th Annual Meeting of the American Fisheries Society. Reno Nevada. September 29.
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September 2019
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Relicensing proceedings invoke a range of knowledge sources and agency regulators are tasked with using the “best available science” (BAS) to make informed decisions about hydropower operations and management. Enhanced understanding of information use may aid in identifying pathways for well-informed relicensing decisions.
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Vogel, S., Jansujwicz, J., and Zydlewski, J. (2018) Unraveling the FERC eLibrary: fish passage and hydro relicensing. Maine Cooperative Fish and Wildlife Research Unit Cooperator’s Meeting, March 22. University of Maine, Orono.
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March 2018
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The FERC relicensing process is a critical phadse for managers to assess fish passage criteria. We are using a document analysis of the FERC eLibrary to inform patterns in the process.
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Vogel, S., Jansujwicz, J., and Zydlewski, J. (2018) The role of science in hydropower licensing: Lessons from the Kennebec and Penobscot Rivers, Maine. 148th Annual Meeting of the American Fisheries Society. Atlantic City, New Jersey. August 20.
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August 2018
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Over the next decade, nearly 25 percent of active hydropower projects in the United States will require relicensing by the Federal Energy Regulatory Commission (FERC). To better understand the use and perception of science in relicensing, we investigated how stakeholders and FERC use certain types of knowledge (e.g., peer reviewed papers, consultant reports, impact statements).
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Vogel, S., Jansujwicz, J., and Zydlewski, J. (2018) Fish Passage at Hydropower Dams on the Penobscot and Kennebec Rivers: A Content Analysis of the FERC eLibrary Database. 2018 Atlantic Salmon Ecosystems Forum. January 17. University of Maine, Orono, Maine.
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January 2018
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Measures to assist migration through dams such as fishways can differ greatly in scope and performance and are often mandated on a case-by-case basis. We are studying the regulatory processes for projects in the Kennebec and Penobscot River watersheds to assess abiotic, biotic and social correlates with regulatory outcomes.
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Vogel, S., Jansujwicz, J., and Zydlewski, J. (2017) Hydropower and Fisheries: Agency Decision Making in the FERC Relicensing Process. 147th Annual Meeting of the American Fisheries Society. Tampa, FL. August 20.
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August 2017
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Over the next decade, nearly 25 percent of active hydropower dams nationwide will require relicensing by the Federal Energy Regulatory Commission (FERC). In an effort to minimize complexity and streamline productivity our research is focused on understanding the factors that influence agency choice of fish passage mitigation requirements.
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Vogel, S., Jansujwicz, J., and Zydlewski, J. (2017) How Regulatory Agencies Weigh Energy and Environmental Tradeoffs in Dam Relicensing Annual meeting of the Maine Cooperative Fish and Wildlife Research Unit, University of Maine, Orono. March 22.
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March 2017
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Over the next decade, nearly 25 percent of active hydropower dams nationwide will require relicensing by the Federal Energy Regulatory Commission (FERC). In an effort to minimize complexity and streamline productivity our research is focused on understanding the factors that influence agency choice of fish passage mitigation requirements.
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Trophic ontogeny of an elusive fish through eye lens stable isotope analysis. Schumacher, G.T., Murphy, C.A., Furey, N.B., Kinnison, M.T., Kronisch, G.R., Erdman, B., Peebles, E.B. Presentation for the American Fisheries Society Annual Meeting. Honolulu, Hawai'i. September 15-19, 2024.
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September 2024
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Ontogenetic niche shifts are an important developmental milestone in many fishes. We are using successive layer eye lens SIA to elucidate the trophic ontogeny of Arctic Charr in three Maine lakes with distinct adult trophic roles: piscivorous, planktivorous, and benthic invertivorous. Future work will relate early life stage trophic variability in Arctic Charr to long-term viability of the species in context of broader food webs and climate driven habitat and resource shifts.
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Tomback, D. F., L. E. Barringer, M. B. Wunder, and S. T. McKinney. Whitebark pine stand condition, tree abundance, and cone production as predictors of visitation by Clark's nutcracker. Whitebark Pine Ecosystem Foundation Science Seminar. Kimberley, British Columbia.
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September 2012
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Thornton, E. and Zydlewski, J. (2016) American eel survival through Milford Dam on the Penobscot River, Maine. 2016 Atlantic Salmon Ecosystems Forum. January 6-7. University of Maine, Orono, Maine.
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January 2016
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There is a need to successfully balance the economic and environmental priorities of hydroelectric dams so that they can efficiently generate power without negatively affecting migratory fish populations. This balance hinges on a better understanding of fish movement and survival through dams. Here, we propose a project that will examine American eel survival through the Milford Dam on the Penobscot River, Maine.
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Stich, D., and Zydlewski, J. (2015) Modeling effects of dam passage performance standards on American shad populations. NOAA National Hydropower Program Meeting. Gloucester, MA. July 9. INVITED
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July 2015
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Shad recovery goals are often poorly informed by population level assessment. A model to characterize shad passage and survival was presented.
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Stich, D., and Zydlewski, J. (2015) Modeling effects of dam passage performance standards on American shad populations. Annual meeting of the Maine Cooperative Fish and Wildlife Research Unit, University of Maine, Orono. March 25.
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March 2015
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American shad recovery in the Penobscot River was modeled. Implications for passage were considered.
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Stich, D., and Zydlewski, J. (2015) Modeling effects of dam passage performance standards on American shad populations. 1st Annual University of Maine Freshwater Science Symposium, University of Maine, Orono. January 29.
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January 2015
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The effects of selective passage and of delays of American shad were modeled. Changes and demographics and timing were characterized.
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Stich, D., and Zydlewski, J. (2011). Atlantic salmon smolt movements and survival in the Penobscot River. The Nature Conservancy, September 15, 2011. INVITED
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September 2011
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Discussion of Atlantic salmon smolt mortality in the Penobscot River
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Stich, D., and Zydlewski, J. (2011). Atlantic salmon smolt behavior and survival 2010 and 2011. Penobscot River Restoration Trust, November 15, 2011.
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November 2011
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Atlantic salmon smolt behavior and survival 2010 and 2011
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Stich, D., Zydlewski, J., Bailey, M., Kinnison, M., Kocik, J., and Zydlewski G. (2013) Atlantic salmon smolt survival through dams in the Penobscot River. Maine Cooperative Fish and Wildlife Research Unit Annual Meeting, University of Maine, Orono, Maine. INVITED. March 21.
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March 2013
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The assessment of mortality of Atlantic salmon smolts in the Penobscot River was presented
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Stich, D., Sheehan, T., and Zydlewski, J. Effects of Dam Passage Performance Standards on American Shad Population Demographics and Abundance. SUNY Faculty Research Day. November 13. INVITED.
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November 2015
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We describe the development of a stochastic life history-based simulation model for Alosines that can be used to estimate effects of dam passage and migratory delay on vital rates of migrants, distribution of spawning adults, and demographic structuring through space and time. Using an individual-based approach to simulate migration dynamics, we relate fish passage and associated delay at hydropower dams to metrics that can be used to support quantitative-based regulatory decisions.
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Stich, D., Sheehan, T., and Zydlewski, J. (2016) Quantitative decision-support tools for dam passage performance standards in the Northeast US. Maine146th Annual Meeting of the American Fisheries Society. Kansas City, MO. August 23.
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August 2016
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Poor passage and delay at dams can affect population structure and abundance of anadromous fishes and have been causal to range-wide declines in American shad and alewife.We describe a stochastic, life history-based simulation model for American shad in order to support quantitative-based decisions.
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Stich, D., Sheehan, T., and Zydlewski, J. (2016) Projected tradeoffs in population abundance of American shad (Alosa sapidissima) in relation to upstream and downstream passage at dams. 2016 Atlantic Salmon Ecosystems Forum. January 6-7. University of Maine, Orono, Maine.
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January 2016
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We describe the development of a stochastic life history-based simulation model for Alosines that can be used to estimate effects of dam passage and migratory delay on vital rates of migrants, distribution of spawning adults, and demographic structuring through space and time. Using an individual-based approach to simulate migration dynamics, we relate fish passage and associated delay at hydropower dams to metrics that can be used to support quantitative-based regulatory decisions.
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Stich, D., Sheehan, T., and Zydlewski, J. (2015) Performance standards modeling for alosines in the Northeast U.S. 145th Annual Meeting of the American Fisheries Society. Portland Oregon. August 16-20 INVITED.
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August 2015
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Passage failure and delay at dams can affect spatial and demographic structuring of spawning adults and downstream migrants. We describe the development of a stochastic life history-based simulation model for alosines that can be used to estimate effects of dam passage and migratory delay on vital rates of migrants, spatial distribution of spawning adults, and demographic structuring.
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Stich, D., Bailey, M., and Zydlewski, J. (2014) Survival of Atlantic salmon smolts through a hydropower complex in the lower Penobscot River, Maine USA. 2014 Atlantic Salmon and Their Ecosystems Forum, University of Maine, Orono. January 8.
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January 2014
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Survival analysis of downstream migrating Atlantic salmon smolts is presented for the reach of the Penobscot River that is currently the focus of restoration actions. The data suggest that the current dam removals are unlikely to improve overall smolt survival through the reach because of remaining and increased hydropower activity.
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Stich, D., Bailey, M., Kinnison, M., Kocik, J., Zydlewski, G., and Zydlewski, J. (2015) Atlantic salmon smolt survival during freshwater and estuary migrations. Annual meeting of the Maine Cooperative Fish and Wildlife Research Unit, University of Maine, Orono. March 25.
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March 2015
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Atlantic salmon smolt survival during freshwater and estuary migrations was presented. Implications for recovery were considered.
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Stich, D., Bailey, M., Holbrook, C., Kinnison, M., Zydlewski, G., Zydlewski, J. (2012) Atlantic salmon smolt movements and survival in the Penobscot River. 2012 Forum, Atlantic Salmon and their Ecosystems, Bangor Maine January 10-11.
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January 2012
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Stich, D., Bailey, M. and Zydlewski, J. (2014) Expecting the Unexpected: Combined Effects of Dam Removal and Re-allocation of Hydropower on Atlantic Salmon Smolt Migrations. 144th Annual Meeting of the American Fisheries Society. Québec City, Canada. August 17-21.
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August 2014
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We evaluated Atlantic Salmon (Salmo salar) smolt survival in the lower Penobscot River, Maine USA through the main-stem of the river and an alternative migration route, the Stillwater Branch. This work was conducted prior to removal of two main-stem dams and doubling of hydropower generation in the Stillwater Branch.
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Stich, D., Bailey,M., Holbrook, C., Kinnison, M., Kocik,J., Zydlewski,G., and Zydlewski, J. (2013) Path choice and survival of Atlantic salmon smolts in the Penobscot River, ME. Poster presentation to DSSRN, January 10.
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January 2013
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Assessmet of smolt survival in the Penobscot River. This is important in light of restoration efforts.
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Stich, D. S., M. Bailey, C. M. Holbrook, M. Kinnison, J. Kocik, G. Zydlewski, and J. Zydlewski (2012) Atlantic salmon smolt migration and survival prior to dam removal. Oral presentation at the 142nd Annual Meeting of the American Fisheries Society, Minneapolis-St. Paul, MN.
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August 2012
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Spencer, R., J. Zydlewski and G. Zydlewski (2008) Comparison of migratory urge and gill Na+,K+-ATPase activity of Atlantic salmon (Salmo salar) smolts from Dennys and Penobscot River stocks. Atlantic Salmon Research Forum. Orono, ME. January 8.
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January 2008
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Spencer, R, Zydlewski, J, Zydlewski, G. Comparing the migratory behavior and physiology of Atlantic salmon smolts from Dennys and Penobscot River stocks. Presented at the 29th Annual Meeting of the Atlantic International Chapter of the American Fisheries Society, 2005, Rangeley, Maine.
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October 2005
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Song, C., Mo, W., Zydlewski, J., and O’Malley, A. (2018) System dynamics modeling of energy and fish tradeoffs under various dam decision scenarios. International Symposium for Sustainable Systems and Technology. June 25. Buffalo, New York.
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June 2018
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We developed a system dynamics model to simulate the tradeoffs between hydropower and diadromous fish populations using five dams on the main-stem of Penobscot River, Maine, as a case study. This model tracks the simulated dynamic behaviors of fish stocks related to hydropower generation for five diadromous fish species (Alewife, Alosa pseudoharengus; American shad A. sapidissima; Atlantic salmon, Salmo salar; sea lamprey, Petromyzon marinus; and American eel, Anguilla rostrata), over a 50-year
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Song, C., Mo, W., Zydlewski, J., O’Malley, A. (2020) Balancing fish-energy-cost tradeoffs through strategic basin-wide dam management. International Symposium on Sustainable Systems and Technology (ISSST). June 8. Pittsburgh PA
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June 2020
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Dam management often involves tradeoffs among hydropower generation capacity, environmental impacts, and project costs. In order to assess the scope for theoretical tradeoffs, a dynamic model of hydropower production, important fish population, and project costs was developed using the system dynamics modeling technique.
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Song, C., Mo, W., O’Malley, A., Roy, S., Zydlewski, J., and Barber, B. (2019) Managing dams for energy and fish biodiversity tradeoffs: What does a win-win solution take? AEESP Research and Education Conference. University of Arizona, Tucson, Arizona, May 14.
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May 2019
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The work considered the inherent trade-off between hydro power production and fish passage. We use a biological model liked with a power production model to optimize a model system.
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Snyder, S., Stich, D., and Zydlewski, J. (2024) Impacts of dams on river herring populations through their native range: what’s left? The Atlantic Salmon Ecosystems Forum, University of Maine, Orono, Maine. January 9.
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January 2023
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River herring are native along the East Coast of North America and provide ecosystem services to freshwater habitats. To assess coast-wide spawning potential for river herring, we identified historically accessible spawning habitat (pre-dam) in coastal freshwater rivers based on physical river characteristics (stream width, depth, and gradient).
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Snyder, S., Stich, D., and Zydlewski, J. (2024) Impacts of dams on river herring populations through their native range: what’s left? 154th Annual Meeting of American Fisheries Society, Honolulu, Hawai’i. September 15.
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September 2024
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To assess spawning potential for river herring, we identified historically accessible spawning habitat in rivers. To assess the impact of dams on spawning habitat, we characterized spawning habitat upstream and downstream of dams.
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Snook, E., Danylchuk, A., Letcher, B., Zydlewski, J., Whiteley, A., Dubreuil, T., and Hurley, S. (2012) Movement Patterns of Anadromous Brook Trout in a Restored Coastal Stream System in Southern Massachusetts. Oral presentation at the 142nd Annual Meeting of the American Fisheries Society, Minneapolis-St. Paul, MN.
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August 2012
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Smith, R., and Zydlewski, J. (2022) Motive, means and opportunity: Could smallmouth bass be a major predator of Atlantic salmon? 2022 Atlantic Salmon Ecosystems Forum. January 11. University of Maine, Orono, Maine.
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January 2022
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Smallmouth bass (<i>Micropterus dolomieu</i>) is an introduced nonnative fish widespread throughout Maine waters, and is known to be a predator of juvenile salmon during rearing and migration.We will use GIS analysis of electrofishing data from 1956-2020 to assess the spatial and temporal overlap of Atlantic salmon and smallmouth bass in the river systems of Maine.
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Smith, R., Murphy, C., and Zydlewski, J. (2023) Bioenergetics model to estimate predation risk of juvenile Atlantic Salmon by Smallmouth Bass in the Weldon Headpond, Maine. 153rd Annual Meeting of American Fisheries Society, Grand Rapids, Michigan. August 20.
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August 2023
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Smallmouth Bass are known to predate on juvenile salmon during freshwater rearing and during seaward migration but the degree to which this influence is ecologically relevant is poorly characterized. To characterize the potential level of predation by on smolts in this reach, we built a heuristic bioenergetic consumption model.
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Smith, R., Murphy, C., and Zydlewski, J. (2024) Survival of the smallest. Predation on Atlantic Salmon smolts by Smallmouth Bass in the Weldon Headpond. 154th Annual Meeting of American Fisheries Society, Honolulu, Hawai’i. September 15.
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September 2024
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Smallmouth Bass are known to predate on juvenile salmon during freshwater rearing and during seaward migration.To characterize the potential level of predation on migrating smolts in this reach, we built a bioenergetic consumption model.
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Smith, R., Murphy, C. and Zydlewski, J. (2024) Migration Risk: How many Atlantic salmon smolts could smallmouth bass eat during smolt seaward migration in the Weldon headpond? The Atlantic Salmon Ecosystems Forum, University of Maine, Orono, Maine. January 9.
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January 2023
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Evidence suggests that lower survival of migrating smolts in the Weldon Headpond is due in part due to predation. The degree to which this influence is ecologically relevant, however, is poorly characterized.
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Smith, R. and Zydlewski, J. (2022) Are smallmouth bass a major threat to juvenile Atlantic salmon? A habitat suitability model approach. 152st Annual Meeting of the American Fisheries Society. Spokane, WA.
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August 2022
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Smallmouth bass (<i>Micropterus dolomieu</i>) is an introduced nonnative fish widespread throughout Maine waters, and is known to be a predator of juvenile salmon during rearing and migration. The degree to which this influence is ecologically relevant, however, is unknown.
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Smith, R. and Zydlewski, J. (2021) Motive, means and opportunity: Could smallmouth bass be a major predator of Atlantic salmon? 151st Annual Meeting of the American Fisheries Society. Baltimore, MD. November 6.
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November 2021
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Smallmouth bass (<i>Micropterus dolomieu</i>) is an introduced nonnative fish widespread throughout Maine waters, and is known to be a predator of juvenile salmon during rearing and migration. We will use mark recapture techniques to assess smallmouth bass density and biomass in a high migratory risk area of the Penobscot River.
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Smith, R. and Zydlewski, J. (2022) Are smallmouth bass a major threat to juvenile Atlantic salmon? A habitat suitability model approach. The Atlantic International Chapter of the American Fisheries Society. Newry, Maine. September 18.
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September 2022
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Are smallmouth bass a major threat to juvenile Atlantic salmon? A habitat suitability model approach.
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Sloane, K., Zydlewski, J., Jayasundara, N. (2021) Phenotypic level changes caused by thermal stress during early development in zebrafish (Danio rerio). 151st Annual Meeting of the American Fisheries Society. Baltimore, MD. November 6.
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November 2021
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We sought to identify phenotypic effects of thermal stress during early development in Zebrafish (<i>Danio rerio</i>). This was done by exposing zebrafish embryos to both acute and long term thermal stress and measuring post-exposure probability of mortality, heartrate, activity, and mitochondrial respiration.
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Sloane, K., Westbrook, M., Jayasundara, N., and Zydlewski, J. (2020) Using micro-respirometry to measure temperature effects on the metabolism of Atlantic Salmon (Salmo salar) during embryonic development. 150th Annual Meeting of the American Fisheries Society. Columbus, Ohio. August 30.
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August 2020
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It has been difficult to quantify energy expenditure during embryonic development in fish due to the absence of a suitable tool for measuring small-scale oxygen consumption rates (OCR). We have developed a 12-well micro-respirometer to measure metabolic rate in Atlantic salmon embryos.
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Sloane, K., Jayasundara, N., Westbrook, M., and Zydlewski, J. (2020) Using micro-respirometry to measure mitochondrial function throughout early development in Atlantic Salmon embryos. Atlantic International Chapter of the American Fisheries Society, Virtual Meeting. August 25.
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August 2020
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Early metabolism may influcen later matabolism in fish. We developed a small scale means of assessing metabolic performance .
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Simons, E. M., W. B. Krohn, and D. J. Harrison. Influences of past and future forest management on the spatiotemporal dynamics of habitat supply for Canada lynx and American marten. Presentation at the Cooperators’ Meeting, Maine Cooperative Fish
and Wildlife Research Unit, University of Maine, Orono.
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May 2010
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Simons, E. M., D. J. Harrison, and W. B. Krohn. Influences of past and future forest
management on the spatiotemporal dynamics of habitat supply for Canada lynx and
American martens in northern Maine. Invited presentation to the Director and
Division supervisors of the Maine Forest Service, Augusta, ME. (Krohn & Harrison were the presenters).
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June 2009
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Simons, D. J. Harrison, and W. B. Krohn. Ecological factors associated with landscape-scale occurrence of Canada lynx in northern Maine. Canada Lynx on the Border: Biological and Political Realities for Conservation Planning. International Workshop Organized by the University of Minnesota, Grand Portage, MN. (Simons presented).
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October 2007
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Simon, E. M., D. J. Harrison, W. B. Krohn, K. R. Legaard, J. S. Wilson, and S. A. Sader. “Past and future trends in habitat supply for marten and lynx across the landscapes of
northern Maine, 1973-2032.” Invited presentation at special wildlife/forestry session
of "Bio: Mass, Fuel, Products, Diversity" Resource Management in a Changing World, ”
a joint conference of the Northeast Section of the Society of American Foresters and the
Maine Chapter of The Wildlife Society. Portland, ME.
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March 2009
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Sigourney, D., and Zydlewski, J. (2016) Modeling Migration of Silver Eels to Forecast Critical Intervals of Risk 2016 Atlantic Salmon Ecosystems Forum. January 6-7. University of Maine, Orono, Maine.
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January 2016
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Populations of eels are in decline worldwide. To help mitigate dam mortality, we are working to develop a tool that can forecast migratory events.
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Sigourney, D., Hughes, E., Zydlewski, J., and Cox, O. (2012) Monitoring adult Atlantic salmon in the Penobscot River using PIT telemetry. 2012 Forum, Atlantic Salmon and their Ecosystems, Bangor Maine January 10-11.
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January 2012
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Sigourney, D., Hughes, E., Cox, O., O’Malley, A. and Zydlewski, J. (2012) Assessment of Live Transport of adult Atlantic salmon in the Penobscot River, USA. Oral presentation at the 142nd Annual Meeting of the American Fisheries Society, Minneapolis-St. Paul, MN.
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August 2012
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Sigourney, D. and Zydlewski, J.(2013) Modeling the downstream migration of silver American eel . The Nature Conservancy, Brunswick Maine. September 17. INVITED.
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September 2013
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Presentation of a model to predict the timing of downstream migrating American eel
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Sigourney, D. and Zydlewski, J. (2015) Modeling Migration of Silver Eels to Forecast Critical Intervals of Risk 145th Annual Meeting of the American Fisheries Society. Portland Oregon. August 16-20 INVITED, PRESENTED.
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August 2015
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Populations of eels are in decline worldwide and one potentially significant source of mortality may occur at hydroelectric facilities during the downstream migration of adult silver eels. We assess the utility of Bayesian hierarchical modeling methods to forecast the probability of migratory events of silver eels.
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Sigourney, B. and Zydlewski, J. (2014) Modeling Migration of Silver Eels to Forecast Critical Intervals of Risk. 144th Annual Meeting of the American Fisheries Society. Québec City, Canada. August 17-21.
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August 2014
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We compare two approaches that combine information on daily counts of migrating eels with information on environmental conditions to predict migration. We apply our modeling approach to multiple data sets of migrating eels and assess the ability to forecast migration in systems that are both data rich and data poor in terms of information on eel migrations.
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Sigourney D. and Zydlewski, J. (2012) Passage at West Enfield Dam. Oral presentation at the Atlantic salmon passage working group, INVITED October 5.
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October 2012
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Assessment of salmon passage at West Enfield Dam.
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Sigourney D. and Zydlewski, J. (2012) Passage at West Enfield Dam 2002-2004 and 2010-2012. Oral presentation at the Atlantic salmon passage working group. INVITED, PRESENTED, October 8.
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October 2012
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Compared Atlantic salmon passage before and after modifications to West Enfield Dam.
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Scott, S. A., W. B. Krohn, and D. J. Harrison. Influence of declining snowshoe hare densities on
Canada Lynx occurrence in northern Maine. Poster presented at the Cooperators’
Meeting, Maine Cooperative Fish and Wildlife Research Unit, University of Maine, Orono.
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May 2010
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Scott, S. A., D. J. Harrison, and W. B. Krohn. “The relative effects of forest practices and natural population processes on the temporal dynamics of snowshoe hare populations in northern Maine.” Invited presentation at special wildlife/forestry session of "Bio: Mass, Fuel, Products, Diversity" Resource Management in a Changing World, ” a joint
conference of the Northeast Section of the Society of American Foresters and the Maine
Chapter of The Wildlife Society. Portland, ME.
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March 2009
|
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Scott, S. A., D. J. Harrison, and W. B. Krohn. (Krohn and Harrison presented). Spatio-temporal
Dynamics of Snowshoe Hare Density and Relationships to Canada Lynx Occurrence in
Northern Maine. Maine Cooperative Forestry Research Unit, University of Maine, Orono.
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January 2010
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Scott, S. A., D. J. Harrison, and W. B. Krohn. “Spatio-temporal dynamics of snowshoe hares in northern Maine.” Presentation at the Northeast Fish and Wildlife Conference,
Lancaster, PA.
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April 2009
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Schumacher, G.T., Murphy, C.A., Furey, N.B., Kinnison, M.T., Can trophic flexibility mitigate shifting habitat and community structure for a climate-sensitive fish? Presentation to Society for Freshwater Science Annual Meeting. Philadelphia, PA.
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June 2024
|
Global climate change is expected to have broad consequences in aquatic ecosystems. In lakes, climate change is expected to alter resource availability and community structure. Long term results of this project are intended to inform modeling of Arctic Charr trophic responses under a variety of climate change scenarios, improving our understanding of the long-term viability of this and other cold-water adapted vulnerable species.
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Schaefer, S. M., W. B. Krohn, and R. J. O'Connor. A new approach for testing the accuracy of vertebrate occurrence predictions. Abstract and presentation at the Twelfth Annual National Gap Analysis Program Meeting, Shepherdstown, WV. (Schaefer presented).
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August 2002
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Saunders, R., Coghlan, Jr., S., Zydlewski, J. and Sheehan, T. (2011) Dam removal allows re-colonization of historic habitat by three species of anadromous fish in Sedgeunkedunk Stream, Maine. 141th Annual Meeting of the American Fisheries Society. Seattle, Washington. September 4-9.
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September 2011
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Ryan, K., Calhoun, A., and Zydlewski, J. (2012) Using PIT tag technology to understand emergence in spadefoot toads. North America Section - Society for Conservation Biology, Oakland, CA. July 15-18.
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July 2012
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Rustigian, H. L., and W. B. Krohn. GIS-based evaluation of waterfowl and wading bird habitats in Maine. Abstract and poster presented at the Northeast Fish and Wildlife Conference, Portland, ME.
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April 2002
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Rubenstein, S., and Zydlewski, J. (2022) Dams may force semelparity in Atlantic salmon. 152st Annual Meeting of the American Fisheries Society. Spokane, WA.
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August 2022
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Adult Atlantic salmon endure a long upstream migration without feeding, entering freshwater in May-July to reproduce.We modelled the bioenergetic costs incurred by delayed fish under temperature regimes that would be encountered under a “no dam” (no delay) scenario versus one, two, three, or four dams.
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Rubenstein, S., Zydlewski, J., Peterson, E., Jayasundara, N., and Christman, P. (2020) Energetic impacts of passage delays in migrating adult Atlantic salmon2019 Atlantic Salmon Ecosystems Forum. January 14. University of Maine, Orono, Maine.
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January 2020
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Passage delays expose upstream migrating fish to elevated water temperatures causing increased metabolic demand, but there currently exists no clear quantification of metabolic costs and fitness risks. Using temperature logging radio tags and a Distell Fish Fatmeter, we radio tagged, tracked, and measured 66 Atlantic salmon over two years on both the Penobscot and Kennebec Rivers.
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Rubenstein, S., Zydlewski, J., Jayasundara, N., and Christman, P. (2019) Energetic impacts of passage delays in migrating adult Atlantic salmon. 2019 Maine Sustainability and Water Conference, Augusta, Maine. March 28.
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March 2019
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Despite extensive restoration efforts, inefficient fishways at dams continue to act as a barrier to Atlantic salmon movement during upstream spawning migrations. We are characterizing these specific energetic costs of delays to upstream migrating adult salmon with bioenergetics modeling informed by our field work.
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Rubenstein, S., Zydlewski, J., Jayasundara, N., and Christman, P. (2019) Energetic impacts of passage delays in migrating adult Atlantic salmon. 2019 Coordinating Committee Meeting of the U.S. Geological Survey, Maine Cooperative Fish and Wildlife Research Unit. Orono, ME. March 26. (Poster)
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March 2019
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Atlantic salmon are often delayed at dams. We explore the theoretical cost of thermally accelerated metabolic loss on the success of these migrants.
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Rubenstein, S., Peterson, E., and Zydlewski, J. (2020) The impact of dams on Migrating adult Atlantic Salmon. Penobscot County Conservation Association. Brewer, ME. January 9.
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January 2020
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Dams slow the migration of Atlantic salmon. The cost of these delays was discussed.
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Rubenstein, S., Peterson, E., Jayasundara, N., Christman, P., and Zydlewski, J. (2020) Energetic and spawning consequences to upstream migrating Atlantic salmon delayed below dams. 150th Annual Meeting of the American Fisheries Society. Columbus, Ohio. August 30.
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August 2020
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Inefficient fishways at dams continue to slow and prevent upstream migrations to spawning habitat; delays of weeks to months are common.We used a Distell Fish Fatmeter and radio telemetry techniques to assess thermal experience and energy loss in fish delayed at dams.
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Rubenstein, S., Peterson, E., Christman, P., Jayasundara, N., and Zydlewski, J. (2021) Dams may force semelparity in Atlantic salmon. 151st Annual Meeting of the American Fisheries Society. Baltimore, MD. November 6.
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November 2021
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The remaining wild populations of U.S. Atlantic salmon are predominantly found in Maine rivers within highly dammed watersheds. Our model indicates a 65% decrease in the number of fish that would have enough reserves to spawn successfully and recondition (potential repeat spawners) if forced to pass four dams.
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Rubenstein, S., Jayasundara, N., and Zydlewski, J. (2018) Energetic impacts of passage delays in migrating adult Atlantic salmon. Maine Cooperative Fish and Wildlife Research Unit Cooperator’s Meeting, March 22. University of Maine, Orono.
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March 2018
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Atlantic salmon in the Penobscot River experienced delays at dams. We are using energetic modeling to inform the biological risk of delay.
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Rubenstein, S., Jayasundara, N., and Zydlewski, J. (2018) Energetic impacts of passage delays in migrating adult Atlantic salmon. 148th Annual Meeting of the American Fisheries Society. Atlantic City, New Jersey. August 20.
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August 2018
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Even if successful, upstream migrating adult Atlantic salmon can experience delays for several weeks at higher temperatures that would otherwise be experienced if unimpeded. We intend to characterize energetic costs of these delays at the first dams on the Penobscot and Kennebec Rivers
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Rubenstein, S., Jayasundara, N., Christman, P., Peterson, E., and Zydlewski, J. (2019) Energetic impacts of passage delays in migrating adult Atlantic salmon 149th Annual Meeting of the American Fisheries Society. Reno Nevada. September 29.
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September 2019
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During migration, long delays (weeks to months) are commonly observed below dams, exposing fish to elevated water temperatures approaching 27oC. We sought to assess the role of thermal exposure (ATUs) on energy depletion in the field.
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Roy, S., Uchida, E., Wilson, K., Neptune, S., Gold, A., Gardner, K., Klein, S., Fox, E., Smith, S., Zydlewski, J., and Hart, D. (2018) How interdisciplinary approaches to big data analytics can strengthen the role of science in dam decisions. Society for Freshwater Science. May 20. Detroit, Michigan.
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May 2018
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We draw upon a wide array of data sources to examine trade-offs between multiple ecosystem services, such as hydropower, fish passage, recreation, and water supply, that are valued by stakeholders and impacted by dam decisions at multiple spatial scales. Based on model results, we find numerous opportunities to restore historic anadromous fish habitat while minimizing reductions in other important services such as water supply or hydropower.
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Robinson, L., D. J. Harrison. W. B. Krohn, J. H. Vashon, and M. A. McCollough. Ecological factors associated with the distribution of Canada lynx (Lynx canadensis) in northern Maine. Presentation to Carnivores 2006. St. Petersburg, FL. (Robinson presented).
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November 2006
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Ratten, S., and Zydlewski, J. (2013) An evaluation of reintroduced lake whitefish in St. Froid Lake. Maine Cooperative Fish and Wildlife Research Unit Annual Meeting, University of Maine, Orono, Maine. INVITED. March 21.
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March 2013
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The reintroduction of lake whitefish was assessed using telemetry and trap netting.
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Ratten, S. and Zydlewski, J. (2012) Evaluating lake whitefish reintroduction in St. Froid Lake, Winterville, Maine. Oral presentation at the 142nd Annual Meeting of the American Fisheries Society, Minneapolis-St. Paul, MN.
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August 2012
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Ratten, S. and Zydlewski, J. (2011) Growth and movements of lake whitefish in two Maine lakes. 141th Annual Meeting of the American Fisheries Society. Seattle, Washington. September 4-9.
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September 2011
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Ramberg-Pihl, N., Greig, H., Coghlan, Jr., S. and Zydlewski, J. (2016). Unraveling the Impacts of Temperature, Flow, Prey Availability, and Competition on Juvenile Atlantic Salmon (Salmo salar) Performance in a Rapidly Changing Climate 2016 Harold W. Borns, Jr. Symposium April 14.
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April 2016
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Juvenile salmon compete in habitats where they compete with conspecifics, native and non-native fish. We discuss the initiation of a project to assess levels of competition between these fish.
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Ramberg-Pihl, N., Coghlan, C., and Zydlewski, J. (2019) Unraveling the impacts of competition and warming on juvenile Atlantic salmon (Salmo salar) performance in Maine streams. The 2019 Annual Meeting of the Society for Freshwater Science, Salt Lake City, Utah, May 19.
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May 2019
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Understanding the temperature dependence of competition with warmwater species is a key aspect of managing salmonid fish populations in future climate change. We conducted a microcosm experiment to examine the performance of juvenile Atlantic salmon (Salmo salar) at two temperatures (18C and 21C) in the presence and absence of non-native smallmouth bass (Micropterus dolomieu).
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Pham, K., Murphy, C.A., Romer, J.D., Stertz, K.A. 2024. Freshwater CSI: Chinook Salmon life-history influences how diagnostic structures relate to fish length. Presentation to the Society for Freshwater Science Annual Meeting, Philadelphia, PA.
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June 2024
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Bones and similar structures can provide information on the species and estimated sizes of decomposed or digested fishes. Our observations highlight the need for population and life history specific allometric data when constructing regression models to ensure they are representative of the target population.
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Peterson, E., and Zydlewski, J. (2020) Do they need to know to go? Motivation for dam passage in American shad from the Penobscot River, Maine. 150th Annual Meeting of the American Fisheries Society. Columbus, Ohio. August 30.
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August 2020
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Recent dam removals and fish passage improvements on the Penobscot River have restored access to over 97% of the historic spawning range of American shad as of 2014. We evaluated factors contributing to passage motivation in adults by radio tagging migrants downstream of the lowest dam on the river, Milford Dam (unknown motivation), and comparing them with fish tagged at the dam (demonstrated motivation) and released into the headpond beginning in 2018.
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Peterson, E., and Zydlewski, J. (2019) American Shad demography and motivation: a re-evaluation of Penobscot River American Shad post dam removal. 2019 Maine Sustainability and Water Conference, Augusta, Maine. March 28.
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March 2019
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It has been hypothesized that the removal of two dams and improved connectivity to the upper Penobscot River will increase population levels of American shad, but also eventually shift population demographics to younger fish single spawn fish. We examined the age structure and iteroparity rates of spawners in 2018 and compared ages and iteroparity rates for shad sampled below Milford Dam (now the lowermost dam) and those that successfully passed.
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Peterson, E., and Zydlewski, J. (2019) American Shad demography and motivation: a re-evaluation of Penobscot River American Shad post dam removal. 2019 Coordinating Committee Meeting of the U.S. Geological Survey, Maine Cooperative Fish and Wildlife Research Unit. Orono, ME. March 26. (Poster)
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March 2019
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Dam removal on the Penobscot River has led to the access to nearly the complete historic range of American shad. We used telemetry to assess how this new habitat is being used.
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Peterson, E., Sheehan, T.F., and Zydlewski, J. (2018) Verification of circulus deposition rates in Atlantic salmon Salmo salar smolts from three Maine rivers. 2018 Atlantic Salmon Ecosystems Forum. January 17. University of Maine, Orono, Maine.
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January 2018
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Annual patterns of growth are proportionally back-calculated from scale growth rates, but this depends on an assumption that the formation of circuli are constant over time. We used scales from 162 of these fish to calculate circulus deposition rate between known sampling dates.
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Peterson, E., Sheehan, T. and Zydlewski, J. (2018) Verification of circulus deposition rates in Atlantic salmon, Salmo salar, smolts from three Maine rivers. 148th Annual Meeting of the American Fisheries Society. Atlantic City, New Jersey. August 20.
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August 2018
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Annual patterns of growth are proportionally back-calculated from scale growth rates, but this depends on an assumption that the formation of circuli is constant over time. To characterize the formation of circuli in Atlantic salmon during their ocean phase, smolts originating from brood-stock collected from the Dennys, Machias, and East Machias rivers were obtained and raised in marine net pens.
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Peterson, E., Rubenstein, S., and Zydlewski, J. (2020) Adult Atlantic Salmon passage at Milford Dam in a changed Penobscot River, Maine. 150th Annual Meeting of the American Fisheries Society. Columbus, Ohio. August 30.
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August 2020
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We assessed the passage of sea-run adult Atlantic salmon returning to the Penobscot River, Maine using radio telemetry. Across all years, 94% of fish that approached Milford passed successfully, but only 27% passed within the 48-hour window required by FERC.
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Peterson, E., Rubenstein, S., and Zydlewski, J. (2020) Movements of radio-tagged Atlantic salmon (Salmo salar) in the Penobscot River, Maine. 2019 Atlantic Salmon Ecosystems Forum.January 14. University of Maine, Orono, Maine.
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January 2020
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Atlantic salmon (<i>Salmo salar</i>) runs have experienced significant declines due to extensive damming in the Penobscot River, Maine. We tagged and tracked 99 adult Atlantic salmon in 2018-2019 using gastrically implanted radio tags.
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Peterson, E., Rubenstein, S., Maynard, G., and Zydlewski, J. (2022)System-wide migratory delays of Atlantic Salmon Salmo salar in the Penobscot River, Maine. 2022 Atlantic Salmon Ecosystems Forum. January 11. University of Maine, Orono, Maine.
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January 2022
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Delays caused by dams adversely affect adult Atlantic salmon (<i>Salmo salar</i>) as they move from the ocean to their spawning grounds. We used a seven-year dataset of 309 radio-tagged adult Atlantic salmon from the Penobscot River, Maine, to investigate delays and passage efficiency at six main-stem dams.
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Peterson, E., Maynard, G. and Zydlewski, J. (2018) Penobscot River Restoration Project, Upstream migrations on the Penobscot River, Maine. Maine Cooperative Fish and Wildlife Research Unit Cooperator’s Meeting, March 22. University of Maine, Orono.
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March 2018
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Anadromous fish in the Penobscot River have experienced an increase in habitat access after the removal of two main stem dams. We are using telemetry to characterize upstream migration in several species.
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Peterson, E., Frechette, D., Thors, R., and Zydlewski, J. (2022) Sea Lamprey Migration and Passage at Milford Dam. 2022 Atlantic Salmon Ecosystems Forum. January 11. University of Maine, Orono, Maine.
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January 2022
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Restoring sea lamprey and the ecosystem services they provide, therefore, relies on effective fish passage at existing dams. In 2020 and 2021 we assessed the ability of lamprey to find and use the fish lift by tagging fish and releasing them 1 km downstream from the Milford Dam on the Penobscot River.
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Peterson, E., Frechette, D., Thors, R., Zydlewski, J. (2021) Migration of adult sea lamprey in the vicinity of the Milford Dam, Penobscot River, ME. 151st Annual Meeting of the American Fisheries Society. Baltimore, MD. November 6.
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November 2021
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Because adults must access freshwater rivers in order to spawn, anadromous sea lamprey restoration is impeded by dams and relies on effective fish passage.These data suggest a high capacity for the restoration of these fish in response to effective passage.
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Peterson, E., Zydlewski, J. (2020) Movement behavior of American shad five years after dam removal in the Penobscot River, Maine. Penobscot County Conservation Association. Brewer, ME. January 9.
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January 2020
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Movement behavior of American shad five years after dam removal in the Penobscot River, Maine was studied . Diffeences in motivation, age and spawning experience were assessed.
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Peterson, E. and Zydlewski, J. (2019) Movement Behavior of American Shad Five Years After Dam Removal in the Penobscot River, Maine 149th Annual Meeting of the American Fisheries Society. Reno Nevada. September 29.
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September 2019
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American Shad (Alosa sapidissima) runs have experienced significant declines due to extensive damming in the Penobscot River, Maine. These data provide the first information about movement rates and migratory extents in newly-accessible stretches of the river.
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Peterson, E. and Zydlewski, J. (2020) American shad movements in the Penobscot River. Atlantic International Chapter of the American Fisheries Society, Virtual Meeting. August 25.
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August 2020
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After dam removal in the Penobscot River, American shad have improved access to much of their historic habitat. Movements of fish in this recovering population were discussed.
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O’Malley,A., Zydlewski,J., Coghlan, S., Parrish, D. (2013) Assessing a Hatchery Based Rainbow Smelt (Osmerus mordax) Supplementation Effort. Maine Cooperative Fish and Wildlife Research Unit Annual Meeting, University of Maine, Orono, Maine. INVITED. March 21.
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March 2013
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Description of efforts to mark and track smelt introductions in Maine
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O’Malley, A., and Zydlewski, J. (2015) Forage Fish Research and Management Across North America: Parallels and novelties from coast to coast. 145th Annual Meeting of the American Fisheries Society. Portland Oregon. August 16-20 INVITED.
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August 2015
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Rainbow smelt are an important part of coldwater fish communities in Maine lakes. We sought to assess the efficacy of stocking on supplementing a population.
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O’Malley, A., and Zydlewski, J. (2015) Distribution and Abundance of Zooplankton and Larval Fish in Several Small Maine Lakes. Maine Fisheries and Wildlife Cooperative Research Unit, Annual Cooperators Meeting, University of Maine, Orono ME. March 25.
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March 2015
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The efficacy of rainbow smelt stocking was considered. Data suggest variable results.
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O’Malley, A., and Zydlewski, J. (2015) Distribution and Abundance of Zooplankton and Larval Fish in Several Small Maine Lakes. 1st Annual University of Maine Maine Freshwater Science Symposium, University of Maine, Orono ME. January 29.
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January 2015
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As part of a study on smelt stocking, the distribution of planktonic fish and invertebrates was assessed. Daily and spatial correlates were considered.
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O’Malley, A., and Zydlewski, J. (2015) Assessment of a Hatchery Based Rainbow Smelt Supplementation Effort. Maine Department of Inland Fish and Wildlife Baitfish Working Group, Bangor ME. April 15. INVITED.
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March 2015
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Results from hatchery supplementation of rainbow smelt were presented. Implications for management were considered.
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O’Malley, A., and Zydlewski, J. (2015) Assessment of a Hatchery Based Rainbow Smelt Supplementation Effort. Annual meeting of the Maine Cooperative Fish and Wildlife Research Unit, University of Maine, Orono. March 25.
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March 2015
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Presentation of the efficacy of smelt stocking methodologies in Maine lakes. Survival was variable from site to site.
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O’Malley, A., and Zydlewski, J. (2014) Assessment of a Hatchery Based Rainbow Smelt Supplementation Effort. Maine Department of Inland Fish and Wildlife Divisional Meeting, Bangor ME. INVITED. December 1.
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December 2014
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Data from lakes stocked with rainbow smelt were presented. Implications for State approaches were considered.
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O’Malley, A., Zydlewski, J., and Enterline, C. (2016) Size, age, and longevity of seven populations of landlocked and anadromous rainbow smelt (Osmerus mordax). Annual meeting of the Maine Cooperative Fish and Wildlife Research Unit, University of Maine, Orono. March 23.
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March 2016
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Smelt have declined in New England. Demographic patterns are discussed.
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O’Malley, A., Zydlewski, J., and Enterline, C. (2016) Size, age, and longevity of seven populations of landlocked and anadromous rainbow smelt (Osmerus mordax). 2016 Atlantic Salmon Ecosystems Forum. January 6-7. University of Maine, Orono, Maine.
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January 2016
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We compared ages of smelt using scales and otoliths from four anadromous populations of smelt from coastal Maine. Additionally, we back calculated size at age for the four coastal populations and three landlocked populations from western Maine.
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O’Malley, A., Zydlewski, J., Cox, O., Ruksznis, P., Trial, J. (2012)The fate of lower mode Atlantic salmon, Salmo salar, stocked into the Penobscot River, Maine. 2012 Forum, Atlantic Salmon and their Ecosystems, Bangor Maine January 10-11.
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January 2012
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O’Malley, A., Zydlewski, J. and DeGraaf, D. (2014). Assessment of a hatchery based rainbow smelt, Osmerus mordax, and supplementation effort. 144th Annual Meeting of the American Fisheries Society. Québec City, Canada. August 17-21.
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August 2014
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The successful development of hatchery cultured smelt has opened a potential new avenue for establishing, maintaining or supporting smelt populations.We sought to assess the efficacy of stocking on supporting or supplementing a smelt population.
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Ouimet, A., Vogel, S.K., Loftin, C., Zydlewski, J.D. Investigating collaborative networks: A Maine Co-op case study. [poster] Maine Cooperative Fish and Wildlife Research Unit Annual Meeting. July 12, 2022. Orono, ME.
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July 2023
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The U.S. Geological Survey’s (USGS) Cooperative Fish and Wildlife Research Units (CRU) program establishes relationships among the USGS, U.S. Fish and Wildlife Service, Wildlife Management Institute, host universities, and state resource agencies. This research focuses on analyzing Unit scientist impacts and outputs by assessing the collaborative networks of the Units and the production of scientific publications as one measure of impact.
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Njuguna, E., C. Murphy, C. Loftin, M. Hunter, D. Courtemanch, S. Horn, and P. Njoroge. 2022. Developing a Biotic Index for the Upper Tana Watershed, Kenya, using Community Science. Annual Meeting of the Association of Field Ornithologists, Plymouth, MA, 17-21 October.
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October 2022
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Measuring ecosystem integrity at a watershed scale often relies on assessments of aquatic macroinvertebrates, fish, and algae, yet indices developed from these taxa may be expensive and time consuming. The popularity of birding and the recent increases in community science projects associated with birds suggest that they may provide a promising alternative. We are developing an avian biotic index to assess the status of the Upper Tana Watershed in Kenya as a case study, using community science
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Njuguna, E. Murphy, C.A., Loftin, C., Hunter, M., McGill, B., Courtemanch, D., Njoroge, P. 2024. Bridging community science and standardized bird-based biotic indices to advance watershed monitoring. Presentation to Society for Freshwater Science Annual Meeting. Philadelphia, PA.
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June 2024
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Measuring ecosystem integrity at a watershed scale may be important to understanding conservation options and setting priorities. Community science bird data applied to watershed bioassessments may present new opportunities to connect avian monitoring with freshwater science while engaging the public.
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Murphy, C.A., Zydlewski, J. Gill maggots: helpful or headache? Presentation to the Atlantic Salmon Ecosystems Forum. January 2023. Orono, Maine.
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January 2023
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Salmon gill maggots can impair respiration and swimming ability for young salmon but may provide insights into important life history events such as repeat spawning. Reduced populations of naturally produced Atlantic Salmon may influence contemporary parasite distributions and abundance.
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Murphy, C.A., Olivos, J.A., Johnson, S.L., and Whiles, M.R. Modelling aquatic ecosystems and food webs under global change, Symposium Proposal for the 2022 Joint Aquatic Sciences Meeting, May 14-20 Grand Rapids Michigan
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May 2022
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Climate change and increased frequency of extreme events have the potential to alter ecological relationships, from physical to chemical to biological interactions. The goal of this session is to exchange ideas on potential climate change impacts and solutions as well as to showcase the many modelling techniques that can be employed to better understand dynamics in streams, lakes and reservoirs.
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Murphy, C.A., Olivos, J.A., Arismendi, I., Bellmore, J.R., Johnson, S.L., Dunham, J., Garcia-Berthou, E. 2022. In the GRAND scheme of things: Contributions of barriers and flow alterations to global freshwater fish imperilment. Presentation at the American Fisheries Society Annual Meeting. Spokane, WA.
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August 2022
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Freshwater fishes are considered to be one of the most endangered groups of animals in the world. We use a large database to examine relationships between RedList status and environmental, social, and taxonomic variables.
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Murphy, C.A., Gerth, W., Wallick, J.R., White, J. 2024. Invertebrate Indicators of Environmental Flows in the Willamette Basin, Oregon. Presentation to the Society for Freshwater Sciences Annual Meeting, Philadelphia, PA.
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June 2024
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Ecological flows are outflows designed to maintain ecological integrity in reaches below dams. However, evaluation of the implementation and effectiveness of these flow regimes can be limited. We discuss one case study in the Willamette Basin, Oregon where environmental flows have been implemented as part of the national Sustainable Rivers Program.
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Murphy, C.A. and Arismendi I. Cruising faster than Usain Bolt. For submission as an EcoPic to Frontiers in Ecology and the Environment.
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March 2022
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<i>Salmincola californiensis</i> are freshwater parasitic copepods of Pacific Salmon and trout (genus <i>Oncorhynchus</i>). While other types of adult copepods are well known for their world record jump speeds, little is known about the speeds of parasitic copepodids.
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Murphy, C.A. Understanding PFAS variability in fishes. Maine Sustainability & Water Conference. Augusta, ME.
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March 2024
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PFAS compounds are of increasing human health and environmental concern. Even with guidance, variability exists in current fish collection methods, sample sizes, species, and waterbodies sampled within and outside of Maine.
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Murphy, C.A. Phytoplankton to fish: An ecological exploration of reservoirs. Presentation to the Oregon Lakes Association Meeting. November 15, 2023. Corvallis, OR.
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November 2023
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Large dams (>15‐m height) have long been recognized as having profound implications for aquatic ecosystems. The reservoirs they create alter sediment and nutrient dynamics, change productivity and associated harmful algal blooms, impede fish migrations, and facilitate the establishment of invasive species. They also provide unique opportunities for fish growth and novel food webs.
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Murphy, C.A. 2021. Mothers of Fishes: Inspiration from the Past to the Future. American Fisheries Society Annual Meeting, Baltimore, Maryland.
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November 2021
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Women have been historically underrepresented, but have played increasing roles, in the American Fisheries Society. As the society passes 150 years, we recognize the importance of pioneering women and their contributions to our profession.
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Murphy C.A., Antonelli K., Pollock A., Gerth W. and Arismendi I. (2021). Parasitic Copepodids in Upper Willamette River Reservoirs. Willamette Fisheries Science Review. Virtual stakeholder meeting.
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April 2021
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Parasitic copepods may limit the survival of outmigrating juvenile Chinook Salmon smolts in the Willamette Basin. Identifying the prevalence and distribution of the infectious copepodid life stage of these parasites may aid in remedial actions and inform downstream passage design.
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Molina-Moctezuma, M., and Zydlewski, J. (2020) System-wide survival and movement of Atlantic salmon Salmo salar in the Penobscot River. 150th Annual Meeting of the American Fisheries Society. Columbus, Ohio. August 30.
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August 2020
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Movement, delays, and apparent survival of hatchery Atlantic salmon <i>Salmo salar</i> smolts were evaluated in open river reaches, and at each dam in the Penobscot River, Maine from 2016 to 2019 (n = 1,536).During these years, survival in each reach of 150 km assessed was high, except for Weldon Dam.
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Molina-Moctezuma, A., and Zydlewski, J. (2019) Phenology and energetic effects on Individual physiological response to salinity in Salmo salar juveniles 149th Annual Meeting of the American Fisheries Society. Reno Nevada. September 29.
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September 2019
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Atlantic salmon smolts incur high mortality during estuary entry in the Penobscot River, in Maine. We studied fasted or fed hatchery-reared smolts that were transferred to seawater (or freshwater control) at three times corresponding to early, peak and late estuary arrival.
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Molina-Moctezuma, A., and Zydlewski, J. (2019) Historical movement and survival of Atlantic salmon smolts in the Piscataquis River from 2009-2018. 2019 Maine Sustainability and Water Conference, Augusta, Maine. March 28.
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March 2019
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During the last decade, the Piscataquis River (a tributary of the Penobscot River) has undergone important changes that have modified the experiences that Atlantic salmon smolts face during their downstream migration. From 2009 to 2017 we used acoustic telemetry to understand the passage and survival of downstream migrants.
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Molina-Moctezuma, A., and Zydlewski, J. (2019) Historical movement and survival of Atlantic salmon smolts in the Piscataquis River from 2009-2018. 2019 Coordinating Committee Meeting of the U.S. Geological Survey, Maine Cooperative Fish and Wildlife Research Unit. Orono, ME. March 26. (Poster)
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March 2019
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The Piscataquis River has changed over the last decade. We present data on the survival of Atlantic salmon smolts in this system.
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Molina-Moctezuma, A., and Zydlewski, J. (2019) A decision-making tool for evaluating biological and statistical thresholds for survival analysis of migrating fishes 149th Annual Meeting of the American Fisheries Society. Reno Nevada. September 29.
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September 2019
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Quantifying the downstream survival of migrating fish past hydropower dams is critical for conservation efforts. We developed a web-based tool to explore the relationship between these standards using simulated data as a graphic tool for managers and dam owners.
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Molina-Moctezuma, A., and Zydlewski, J. (2018) System-wide survival of downstream-migrating Atlantic salmon smolts in the Penobscot River, Maine. 2018 Atlantic Salmon Ecosystems Forum. January 17. University of Maine, Orono, Maine.
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January 2018
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A hierarchical multistate model was developed to estimate system-wide survival of downstream-migrating Atlantic salmon (Salmo salar) smolts in the Penobscot River, Maine, for 2017. Increased rates of mortality at a given dam were associated with upstream delays.
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Molina-Moctezuma, A., and Zydlewski, J. (2018) A decision-making tool for evaluating biological and statistical thresholds for survival analysis. 74th Annual Northeast Fish & Wildlife Conference. April 15. Burlington, Vermont.
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April 2018
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Quantifying the downstream survival of migrating fish past hydropower dams is critical for conservation efforts. We have developed a web-based tool that explores and graphically compared these thresholds as a tool for managers and dam owners involved in the assessment of fish survival.
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Molina-Moctezuma, A., and Zydlewski, J. (2017)Assessing Atlantic salmon downstream migration in a changing system (Penobscot River, Maine) Annual meeting of the Maine Cooperative Fish and Wildlife Research Unit, University of Maine, Orono. March 22.
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March 2017
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Quantifying the downstream survival of migrating fish past hydropower dams is critical for conservation efforts. We have developed a web-based tool that explores and graphically compared these thresholds as a tool for managers and dam owners involved in the assessment of fish survival.
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Molina-Moctezuma, A., and Zydlewski, J. (2017) A decision making tool for evaluating biological and statistical thresholds for survival analysis. 147th Annual Meeting of the American Fisheries Society. Tampa, FL. August 20.
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August 2017
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Quantifying the downstream survival of migrating fish past hydropower dams is critical for conservation efforts. We have developed a web-based tool that explores and graphically compared these thresholds as a tool for managers and dam owners involved in the assessment of fish survival.
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Molina-Moctezuma, A., and Zydlewski, J. (2016) Behavioral characterization of downstream-migrating Atlantic salmon smolts in the estuary of the Penobscot River, Maine. Maine146th Annual Meeting of the American Fisheries Society. Kansas City, MO. August 23.
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August 2016
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The estuary phase is critical in the Atlantic salmon, Salmo salar, downstream migration. we present data from more than 2,000 Atlantic salmon juvenile fish that have been acoustically tagged and released in the upper Penobscot River in the last 10 years.
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Molina-Moctezuma, A., and Zydlewski, J. (2022) Effects of flow on system-wide survival and movement of Atlantic salmon, Salmo salar, in the Penobscot River. 2022 Atlantic Salmon Ecosystems Forum. January 11. University of Maine, Orono, Maine.
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January 2022
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We modeled the effects of flow on survival of downstream migrating Atlantic salmon smolts. Movement, delays, and apparent survival of hatchery smolts (n = 1,536) were evaluated in open river reaches and at dam in the Penobscot River, Maine. High flows not only increased survival directly at most dams, but also increased survival by reducing delays.
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Molina-Moctezuma, A., Stich, D., and Zydlewski, J. (2016)Post-restoration assessment of Atlantic salmon (Salmo salar) survival during their downstream migration in the Penobscot River, Maine. Annual meeting of the Maine Cooperative Fish and Wildlife Research Unit, University of Maine, Orono. March 23.
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March 2016
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Atlantic salmon incur high mortality past dams in the Penobscot River. Patterns of survival post restoration activities are discussed.
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Molina-Moctezuma, A., Stich, D., and Zydlewski, J. (2016)Post-restoration assessment of Atlantic salmon (Salmo salar) survival during their downstream migration in the Penobscot River, Maine. 2016 Atlantic Salmon Ecosystems Forum. January 6-7. University of Maine, Orono, Maine.
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January 2016
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We evaluated survival, path choice and movements of Atlantic salmon smolts during their downstream migration after dam removal. All survival and movement estimates were compared to results obtained prior to the Penobscot River restoration (2005 – 2014).
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Molina-Moctezuma, A., Peterson, E., and Zydlewski, J. (2020) Movement and survival of Atlantic salmon, Salmo salar, in the Piscataquis River. 2019 Atlantic Salmon Ecosystems Forum. January 14. University of Maine, Orono, Maine.
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January 2020
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Movement, delays, and survival of hatchery Atlantic salmon <i>Salmo salar</i> smolts were evaluated through the Piscataquis River, a tributary of the Penobscot River, in Maine, USA. Overall, while survival through Howland Dam has improved, in aggregate, passage and delays caused by the three upstream dams represent a critical impediment to the effective use of the high spawning habitat found upstream.<br>
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Molina Moctezuma, A., and Zydlewski, J. (2018) System-wide survival of downstream-migrating Atlantic salmon smolts in the Penobscot River, Maine in 2017. 148th Annual Meeting of the American Fisheries Society. Atlantic City, New Jersey. August 20.
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August 2018
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A hierarchical multistate model was developed to estimate system-wide survival of downstream-migrating Atlantic salmon (Salmo salar) smolts in the Penobscot River, Maine, for 2017. A multi-release approach with six release sites and two release dates was used.
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Molina Moctezuma, A., and Zydlewski, J. (2018) Assessing Atlantic salmon downstream migration in a changing system (Penobscot River, Maine). Maine Cooperative Fish and Wildlife Research Unit Cooperator’s Meeting, March 22. University of Maine, Orono. 22. University of Maine, Orono.
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March 2018
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Atlantic salmon smolts suffer high mortality during downstream migration in the Penobscot River. We are using telemetry to estimate system-wide survival.
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Merriam, C., Frechette, D., and Zydlewski, J. (2024) Reinstating Atlantic salmon's natural spawning and life cycle: Movement and survival of Atlantic salmon in Maine. The Atlantic Salmon Ecosystems Forum, University of Maine, Orono, Maine. January 9.
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January 2023
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Atlantic salmon are iteroparous and capable of spawning multiple times in their lifetime. However, repeat spawners are rare and post-spawn survival and behavior of downstream migrating salmon are poorly characterized.
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Merriam, C., Frechette, D., and Zydlewski, J. (2024) Navigating Barriers: The Continuing Impact of Dams on Atlantic Salmon in Maine. 154th Annual Meeting of American Fisheries Society, Honolulu, Hawai’i. September 15.
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September 2024
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We used acoustic telemetry to monitor two groups of adult Atlantic salmon: 1) pre-spawn fish from a seawater smolt-to-adult supplementation program and 2) post-spawn sea-run returns used for hatchery broodstock. We observed clear behavioral differences between the post-release period.
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Merriam, C., Frechette, D., Gardner, A., and Zydlewski, J. (2023) Adult Atlantic Salmon Movements and Survival in the Penobscot and Machias Rivers. 153rd Annual Meeting of American Fisheries Society, Grand Rapids, Michigan. August 20.
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August 2023
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Atlantic salmon are iteroparous and capable of spawning multiple times in their lifetime. In this study we use acoustic telemetry to monitor three groups of adult Atlantic salmon.
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Merriam, C., Zydlewski, J., and Frechette, D. (2022) Survival and Behavior of Downstream Migrating Post-Spawn Atlantic Salmon. The Atlantic International Chapter of the American Fisheries Society. Newry, Maine. September 18.
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September 2022
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Survival and Behavior of Downstream Migrating Post-Spawn Atlantic Salmon.
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Mensinger, M., Zydlewski, J., and Blomberg, E. (2019) Does American Eel Personality Explain Variation in Juvenile Dispersal? 149th Annual Meeting of the American Fisheries Society. Reno Nevada. September 29.
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September 2019
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We consider variation in eel personality as a potential mechanism to describe this facultative dispersal, where bolder individuals, with greater exploratory behavior, may be more likely to move upstream.Our results provide context for the presence of personality differences in juvenile American eels, which may have implications for inland dispersal.
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Mensinger, M., Zydlewski, J., and Blomberg, E. (2019) American eels incur high mortality at dams during seaward migration in the Penobscot River. 2019 Maine Sustainability and Water Conference, Augusta, Maine. March 28.
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March 2019
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American eels, Anguilla rostrata, embark on one of the most expansive spawning migrations of any diadromous fish species in the fall. To understand the effects of dam passage in the Penobscot River during this life-cycle stage, we captured and implanted acoustic telemetry tags into 100 silver-stage eels annually from 2016-2018 (n= 300).
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Mensinger, M., Zydlewski, J., and Blomberg, E. (2019) American eels incur high mortality at dams during seaward migration in the Penobscot River. 2019 Coordinating Committee Meeting of the U.S. Geological Survey, Maine Cooperative Fish and Wildlife Research Unit. Orono, ME. March 26. (Poster)
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March 2019
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American eels are in decline. We present data on mortalities at dams on the Penobscot River
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Mensinger, M., Zydlewski, J., and Blomberg, E. (2019) American Eels Incur Mortality and Delay at Hydroelectric Dams During Seaward Migration in the Penobscot River, Maine. 149th Annual Meeting of the American Fisheries Society. Reno Nevada. September 29.
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September 2019
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To understand the consequences of dam passage in the Penobscot River, Maine, we captured and implanted acoustic transmitters into adult eels from 2016–2018 (n=300). The reduced survival and impeded migration speed for these fish underscores the negative role dams have in American eel conservation efforts.
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Mensinger, M., Zydlewski, J., Blomberg, E., and Mortelliti, A. (2020) Evidence of personality in juvenile American eels and implications for upstream movement. 150th Annual Meeting of the American Fisheries Society. Columbus, Ohio. August 30.
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August 2020
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American eels (<i>Anguilla rostrata</i>) begin life in the Sargasso Sea, and juveniles persist throughout coastal watersheds in marine, estuarine, and freshwater environments. We considered whether personality might be causal to this variation, where bolder individuals may explore and move into upriver habitat.
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Mensinger, M., Mortelliti, A., and Zydlewski, J. (2023) How does Atlantic salmon smolt size influence predation risk. 153rd Annual Meeting of American Fisheries Society, Grand Rapids, Michigan. August 20.
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August 2023
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Though hatchery-reared smolts are not pre-disposed to predator cues, their larger size may help to counteract predation risk, especially in areas with gape-limited predators . In this study, we evaluated predation risk between standard- (175–220mm FL) and wild-sized (135–165mm FL) hatchery-reared smolts using acoustic telemetry with predation indicators and Predation Event Recorders (PERs) that allow us to directly assess predation on tethered fish.
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Mensinger, M., Hawkes, J., Goulette, G., Mortelliti, A., and Zydlewski, J. (2024) To catch a predator – Using telemetry and tethering to characterize smolt predation in the Penobscot River. The Atlantic Salmon Ecosystems Forum, University of Maine, Orono, Maine. January 9.
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January 2023
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Predation has long been assumed to be a leading source of smolt mortality, but there remains relatively little information on the extent of predation incurred by smolts in the Penobscot River. We used telemetry (acid-sensitive predation transmitters; n=270) and tethering of smolts (n=675) to characterize predation risk throughout the main-stem of the Penobscot River.
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Mensinger, M., Hawkes, J., Goulette, G., Mortelliti, A., and Zydlewski, J. (2024) Changes in Atlantic salmon smolt survival following large-scale river restoration in the Penobscot River, Maine. 154th Annual Meeting of American Fisheries Society, Honolulu, Hawai’i. September 15.
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September 2024
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We used 17 years of acoustic telemetry data to understand how watershed-level changes influence Atlantic salmon smolt survival in the Penobscot River estuary. We are using a CJS model to estimate estuarine survival for 3,600 smolts between 2005–2023.
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Mensinger, M., Hawkes, J., Goulette, G., Mortelliti, A., and Zydlewski, J. (2022) Using acoustic predator tags to characterize predation on Atlantic salmon smolts. 2022 Atlantic Salmon Ecosystems Forum. January 11. University of Maine, Orono, Maine.
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January 2022
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Juvenile salmon (smolts) migrate seaward after 2–3 years of rearing in freshwater and mortality during this 4–6 week emigration period is naturally high. In 2021, we tagged 72 smolts with acoustic “predator” tags which enabled us to recognize predation events and identify body temperatures of the predator species.
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Mensinger, M., Hawkes, J., Goulette, G., Mortelliti, A., and Zydlewski, J. (2021) Using acoustic telemetry to characterize predation on Atlantic salmon smolts. 151st Annual Meeting of the American Fisheries Society. Baltimore, MD. November 6.
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November 2021
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As part of ongoing research in the Penobscot River, >5000 smolts have been tagged with acoustic transmitters and tracked to better understand behavior and to characterize survival during this vulnerable migration stage. We analyzed telemetry tracks from 2005–2019 and defined a series of <i>a priori </i>conditions to distinguish predator behavior (e.g., excessive swimming speed, upstream movements, skipped receivers) from “normal” smolt behavior.
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Mensinger, M., Casey, A., Mortelliti, A., and Zydlewski, J. (2022) Using Predation Event Recorders to directly observe predation on Atlantic salmon smolts. 2022 Oregon Chapter of the American Fisheries Society, 58th Annual Meeting. March 2. Virtual.
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March 2022
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Traditional methods used to assess fish predation are often speculative, limited in their temporal and spatial resolution, and rarely identify the predator. The recent development of Predation Event Recorders (PERs) to study Pacific salmon predation may offer analogous insight into predation risk of Atlantic salmon during smolt migration.
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Mensinger, M., Casey, A., Mortelliti, A., and Zydlewski, J. (2022) Direct observation of Atlantic salmon smolt predation during reservoir migration in the Penobscot River, Maine, USA. 152st Annual Meeting of the American Fisheries Society. Spokane, WA.
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August 2022
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The migratory smolt stage is the focus of considerable conservation effort for both wild and hatchery emigrants. In spring 2022, we used Predation Event Recorders (PERs) to investigate smolt predation in the Weldon Dam reservoir.
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Mensinger, M., Casey, A., Mortelliti, A., and Zydlewski, J. (2021) Using Predation Event Recorders to directly observe predation on Atlantic salmon smolts. 151st Annual Meeting of the American Fisheries Society. Baltimore, MD. November 6.
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November 2021
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Atlantic salmon are exposed to a suite of risks across all stages of their complex, diadromous life cycle.We show direct evidence of predation on Atlantic salmon smolts and highlight the advantages of using Predation Event Recorders beyond traditional methods to measure predation risk.
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Mensinger, M., Casey, A., Mortelliti, A., and Zydlewski, J. (2022) Water temperature and smolt size influence predation risk during reservoir migration. The Atlantic International Chapter of the American Fisheries Society. Newry, Maine. September 18.
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September 2022
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Water temperature and smolt size influence predation risk during reservoir migration
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Mensinger, M., Brehm, A., Mortelliti, A., Blomberg, E., and Zydlewski, J. (2022) American eel personality and body size influence passage success in an experimental fishway. 2022 Atlantic Salmon Ecosystems Forum. January 11. University of Maine, Orono, Maine.
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January 2022
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Fishways offer upstream passage opportunities, but artificial selection may be imposed by these structures. Using juvenile American eel <i>Anguilla rostrata </i>as a model species, we consider whether individual differences in behavior (i.e., personality) and fish size can predict passage success.
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Mensinger, M., Blomberg, E., and Zydlewski, J. (2020) Dams, death, and delay in the Penobscot River - the complex and cumulative influence of hydropower dams on migrating American eels 2019 Atlantic Salmon Ecosystems Forum. January 14. University of Maine, Orono, Maine.
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January 2020
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In impounded watersheds, many migrating adult American eels must navigate hydroelectric dams. To understand the consequences of dam passage in the Penobscot River, Maine, we captured and implanted acoustic transmitters into adult eels from 2016–2019 .
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Mensinger, M., Blomberg, E., and Zydlewski, J. (2020) American eel survival in an impounded river system. Atlantic International Chapter of the American Fisheries Society, Virtual Meeting. August 25.
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August 2020
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American eel survival in the Penobscot River was assessed. patterns of movement, delay and migration were considered.
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Mensinger, Blomberg, E. and Zydlewski, J. (2020) Understanding the influence of dams on migrating eels in the Penobscot River. Penobscot County Conservation Association. Brewer, ME. January 9.
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January 2020
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The influence of dams on migrating eels in the Penobscot River was assessed. Delays and mortalities were quantified at two dams.
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McKinney, S.T., and D.F. Tomback. The viability of evolutionary rescue in natural populations. Society for Conservation Biology North America Congress for Conservation Biology, Missoula, MT.
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July 2014
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This study evaluates the potential efficacy of evolutionary rescue in natural populations through an applied field study of a federally endangered species.
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McKinney, S. T., and D. F. Tomback. Invasive pathogen trumps natural selection thwarting evolutionary rescue. The Ecological Society of America Annual Meeting, Minneapolis, MN.
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August 2013
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This study demonstrates that severe tree mortality from an introduced pathogen alters interspecific relationships in a high-elevation forest community, further hastening the decline and preventing the opportunity for natural selection and evolutionary rescue. The work is important because it will help guide restoration of a keystone and endangered species.
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McKinney, S. T. Trophic cascades and functional losses: Using models of species interactions to restore and imperiled ecosystem. Maine Department of Inland Fisheries and Wildlife, Bangor, Maine.
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March 2012
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Maynard,G., Kinnison, M., and Zydlewski, J. (2016) Size Matters: Fishways can exert size selection in Atlantic salmon migrating in the Penobscot River. Annual meeting of the Maine Cooperative Fish and Wildlife Research Unit, University of Maine, Orono. March 23.
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March 2016
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Fishways are demonstrated to exert size selection in Atlantic salmon migrating in the Penobscot River. Demographic consequences are considered.
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Maynard,G., Dill, R., Kinnison, M., Halteman, W., and Zydlewski, J. (2016) Size Matters: Fishways can exert size selection in Atlantic salmon migrating in the Penobscot River. 2016 Atlantic Salmon Ecosystems Forum. January 6-7. University of Maine, Orono, Maine.
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January 2016
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We investigated the influence of fish size on successful passage through six fishways at hydropower dams on the Penobscot River by tracking Atlantic salmon upstream migration through the system with PIT tags from 2002-2004 and 2010-2012. Passage success at fishways was modeled as a Bayesian logistic regression that included fish size, environmental variables (temperature, flow, timing), and in-river delay as possible predictors of passage success.
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Maynard, J. and Zydlewski, J. (2014) Size selection of adult Atlantic salmon at fish passage facilities on the Penobscot River, Maine. 144th Annual Meeting of the American Fisheries Society. Québec City, Canada. August 17-21.
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August 2014
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Passage success of adult Atlantic salmon was investigated at six fishways at hydropower dams in the lower Penobscot River. At passage facilities in the lower river, success was negatively related to fork length, meaning that those facilities may have been exerting size-selective pressure.
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Maynard, G., and Zydlewski, J. (2015) Size selection of adult Atlantic salmon at fish passage facilities. Annual meeting of the Maine Cooperative Fish and Wildlife Research Unit, University of Maine, Orono. March 25.
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March 2015
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Passage of adult salmon was assessed using PIT telemetry. Data indicate a strong size selective pressure.
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Maynard, G., and Zydlewski, J. (2014) Size selection of adult Atlantic salmon at fish passage facilities on the Penobscot River, Maine. 2014 Atlantic Salmon and Their Ecosystems Forum, University of Maine, Orono. January 8.
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January 2014
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Adult Altantic salmon must pass multiple dams in order to reach spawning habitat in the Penobscot River. PIT telemetry data are presented that reveal a strong size selective influence on passage success of large adults past several dams.
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Maynard, G., Zydlewski, J., and Blomberg, E. (2016) Simulated demographic and evolutionary impacts of size-selective passage at dams on Atlantic salmon body size. Maine146th Annual Meeting of the American Fisheries Society. Kansas City, MO. August 23.
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August 2016
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Atlantic Salmon have a complex life history that involves a multi-year freshwater juvenile phase, several years maturing at sea, and an eventual return to their natal rivers to spawn.We used an individual based model to explore the possible influence of dam-mediated size selection on a population of Atlantic Salmon in the Penobscot River, Maine.
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Maynard, G., Zydlewski, J., Halteman, W., and Blomberg, E. (2015) University Bayesian Analysis of Size-Selective Pressure Exerted on In-Migrating Atlantic Salmon by Fish Passage Facilities on the Penobscot River, Maine. 145th Annual Meeting of the American Fisheries Society. Portland Oregon. August 16-20 INVITED.
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August 2015
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Successful upstream passage of Atlantic salmon through dams is critical to the long-term stability of sea-run populations. The influence of size on passage success of adult Atlantic Salmon was investigated at six fishways at hydropower dams in the Penobscot River.
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Maynard, G., Zydlewski, J., and Kinnison,M. (2022) Demographic and Evolutionary Impacts of Size Selection at Fish ways on Atlantic Salmon. 2022 Atlantic Salmon Ecosystems Forum. January 11. University of Maine, Orono, Maine.
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January 2022
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The migratory routes of Atlantic salmon have been fragmented throughout their range by damming.To determine whether selection at dams can drive evolution of Atlantic salmon, we used an individual-based model under selective pressure previously documented in the Penobscot River to simulate a population of Atlantic salmon in a simplified, relatively small river (~89 rkm) system and followed it over a 100-year period.
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Maynard, G., Kinnison, M., and Zydlewski, J. (2017) Demographic and evolutionary impacts of size selection at fishways on Atlantic Salmon. 147th Annual Meeting of the American Fisheries Society. Tampa, FL. August 20.
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August 2017
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Atlantic Salmon have a complex life history that involves a multi-year freshwater juvenile phase, several years maturing at sea, and an eventual return to their natal rivers to spawn. This work demonstrates the potential for size selective fish passage at dams to have unintended demographic impacts.
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Maynard, G., Kinnison, M., and Zydlewski, J. (2017) Assessing Anadromous Fish Migrations and Habitat Connectivity Following a Major Restoration Effort in the Penobscot River, Maine Annual meeting of the Maine Cooperative Fish and Wildlife Research Unit, University of Maine, Orono. March 22.
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March 2017
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Range-wide, anadromous fish have been impacted by the construction of dams. Changes in the Penobscot Rivere were considered after restoration actions.
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Maynard, G. and Zydlewski, J. (2015) Size selection of adult Atlantic salmon at fish passage facilities. NOAA National Hydropower Program Meeting. Gloucester, MA. July 9. INVITED
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July 2015
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Atlantic salmon must pass dams to reach spawning habitat. Data was presented which demonstrates a size selection pressure on adult migrants.
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Maynard, G. and Zydlewski, J. (2015) Size selection of adult Atlantic salmon at fish passage facilities. 1st Annual University of Maine Freshwater Science Symposium, University of Maine, Orono. January 29.
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January 2015
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PIT telemetry was used to track adult Atlantic salmon. The data indicate a size selective effect of fish way passage.
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Maynard, G. ., Zydlewski, G., and Zydlewski, J. (2017) Use of Newly Available Habitat Following Dam Removal: Tracking American Shad in the Penobscot River. 147th Annual Meeting of the American Fisheries Society. Tampa, FL. August 20.
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August 2017
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American Shad were thought to be extirpated from the Penobscot River until observed using DIDSON in 2010-2011. Following removal of Veazie Dam and the next dam upstream (Great Works), we tracked movements of American Shad that now had access to 20 km of previously unavailable habitat before reaching the first mainstem dam at Milford, Maine.
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Linden, Daniel, W., and Shawn T. McKinney. Integrated population modeling of American black bears: An application of robust-design spatial capture-recapture combined with mark-recovery and recruitment. International Statistical Ecology Conference, Montpellier, France.
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July 2014
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This work utilizes multiple data sets, spanning 39 years, to construct an integrated population model that will allow the state of Maine to derive more information and evaluate their monitoring program.
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Linden, Daniel W., and Shawn T. McKinney. Using all the data: Improving inferences from population models. Eastern Black Bear Workshop, Millinocket, ME.
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April 2013
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Results from this modeling study will help the state of Maine develop a more accurate and cost-effective approach to monitoring black bear population dynamics.
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Linden, Daniel W., and Shawn T. McKinney. Improved inferences on population dynamics of black bears in Maine through integrated modeling. The Wildlife Society Annual Conference, Milwaukee, WI.
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October 2013
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Results from this modeling study will help the state of Maine develop a more accurate and cost-effective approach to monitoring black bear population dynamics.
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Letcher, B. J.Zydlewski, T. Dubreuil, M. O'Donnell and B. Connery (2006) Brook trout growth and movements in a Maine coastal stream, Stanley Brook. Northeast sea-run trout meeting 2006. U.S. Fish and Wildlife Service, Hadley, MA.. December 6.
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December 2006
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Larson, M., Couch, C., Murphy, C.A., Diet and Philonema infections in reservoir-rearing juvenile Chinook Salmon (Oncorhynchus tshawytscha). To be presented at the Oregon Chapter of the American Fisheries Society, Eugene, OR.
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March 2023
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Chinook Salmon rearing in Lookout Point Reservoir were piscivorous in late summer. These juveniles also had unexpectedly high burdens of a parasitic nematode transmitted by free-living copepods.
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Kurth, J.E., C.S. Loftin, J.Rhymer, and J. Zydlewski. Conservation via translocation of freshwater mussels threatened by habitat alteration, presented at the 5th Biennial Symposium of the Freshwater Mollusk Conservation Society, March 12-15, 2007, Little Rock, Arkansas
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March 2007
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Kurth, J.E., C.S. Loftin, J.D. Zydlewski, and J.M. Rhymer. 2005. Use of PIT tags to track freshwater mussels in Maine. Freshwater Mollusk Conservation Society Symposium, 15-18 May, St. Paul, MN. Poster (Abstract)
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May 2005
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Kurth, J.E., C.S. Loftin, J. Zydlewski, and J.Rhymer. 2008. Multi-stage approach using population surveys and pit tags to assess suitability of translocation sites for freshwater mussels threatened by impending dam removal. Presentation to the Annual Meeting of the North American Benthological Association, 25-30 May, Salt lake City, UT.
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May 2008
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Kurth, J.E., C.S. Loftin, J. Zydlewski, and J.Rhymer. Multi-stage approach using population surveys and pit tags to assess suitability of translocation sites for freshwater mussels threatened by impending dam removal. Presentation to the Annual Meeting of the North American Benthological Association, 25-30 May, Salt lake City, UT.
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May 2008
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Kurth, J.E., C.S. Loftin, J. Zydlewski, and J.Rhymer. 2008. Multi-stage approach using population surveys and pit tags to assess suitability of translocation sites for freshwater mussels threatened by impending dam removal. Presentation to the Annual Meeting of the North American Benthological Association, 25-30 May, Salt lake City, UT.
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May 2008
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Kurth, J.E., C.S. Loftin, J. Zydlewski, and J. Rhymer. 2006. Methods for relocation of freshwater mussels threatened by habitat alteration (dam removal) on the Sebasticook River, 12th Annual Maine Water Conference, 22 March, Augusta, ME.
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March 2006
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Kurth, J., Loftin, C., Zydlewski, J., Rhymer, J. (2008) Multi-stage approach using adaptive sampling and pit tags to assess suitability of translocation sites for freshwater mussels threatened by impending dam removal. NABS 56th Annual Meeting, Salt Lake City, Utah. May 29. INVITED.
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May 2008
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Kurth, J., Loftin, C., Zydlewski, J. and Rhymer, J. Use of PIT tags to track fresh water mussels. Freshwater Mollusk Conservation Society Symposium in St. Paul, MN. May 15-18, 2005
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January 2005
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Kurth, J., Loftin, C., Zydlewski, J. and Rhymer, J. 2005. Use of PIT tags to track fresh water mussels. Freshwater Mollusk Conservation Society Symposium in St. Paul, MN. May 15-18, 2005
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January 2005
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Kronisch, G.R., Furey, N.B., Kinnison, M.T., Murphy, C.A., Schumacher, G.T., Banister, T. (2024) Fine-scale Habitat Use by Landlocked Arctic Charr (Salvelinus alpinus) in a Maine, USA Lake. Presentation for OTN Symposium. Halifax, Nova Scotia.
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September 2024
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Arctic charr (<i>Salvelinus alpinus</i>) is a holarctic salmonid whose southern range limit extends to Maine, USA, where it is considered a “Species of Greatest Conservation Need”. As part of a larger study to understand how alternate phenotypes might influence vulnerability to climate change, we are examining fine scale movements and habitat use of a large piscivorous form of Arctic charr in Floods Pond, Otis, Maine.
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Krohn, W.B. Maine's changing wildlife populations: a historical perspective. Invited presentation to the Downeast Salmon Federation, University of Maine, Machias, ME.
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March 2005
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Krohn, W. B., and M. R. Massaro. Fur into feathers: Manly Hardy and his collection of North American birds. 2004 Dublin Seminar for New Folklife Entitled New England Collectors and Collections, Deerfield, MA.
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June 2004
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Krohn, W. B., and E. R. Simons. Using historical data to determine the contemporary distribution of Canada lynx: a cautionary note. Canada Lynx on the Border: Biological and Political Realities for Conservation Planning. International Workshop Organized by the University of Minnesota, Grand Portage, MN.
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October 2007
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Krohn, W. B., J. A. Homyack, and D. J. Harison. Changes in the Acadian forest of the Northeast: implications for wildlife. Abstract and presentation at the 2003 Northeast Fish and Wildlife Conference, Newport, RI.
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April 2003
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Krohn, W. B., Harrison, D. J., and L. Robinson. Recent findings on the relationships among partial harvesting, snowshoe hares, and Canada lynx occurrences in northern Maine. Meeting of the Interagency (Federal) Lynx Biology Group, Duluth, MN.
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October 2006
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Krohn, W. B., D. J. Harrison, and M. A. McCollough. Predicting responses of snowshoe hares and Canada lynx to alternative forest harvesting scernarios across multiple scales. Wildlife Management Institute's Eastern Lynx Workshop, North Conway, NH.
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January 2004
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Krohn, W. B., D. J. Harrison, S. A. Scott, L. L. Robinson, C. L. Hoving, A. K. Fuller, and E. M. Simons. “Variation in Snowshoe Hare Densities as Related to Canada Lynx and Forest Management in Eastern North America.” Eastern Canada/U.S.A. Forest Science Conference, University of Maine, Orono.
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October 2008
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Krohn, W. B. Historic occurrences of fishers and martens in eastern North America: a preliminary evaluation of factors affecting broad-scle distribution. Abstract and presentation at the Tenth Annual Conference of The Wildlife Society, Burlington, VT.
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September 2003
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Krohn, W. B. Cormorants and eagles: indicators of ecological change and integrity in a large riverine system. Invited presentation (and printed abstract) at the Penobscot River Science Form, University of Maine, Orono, ME.
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October 2005
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Krohn, W. B. Changing forestry practices and the habitat ecology of snowshoe hare and Canada lynx in Maine: new projects at the University of Maine. Invited presentation at the Wildlife Conservation Society's workshop on lynx and marten conservation in the northeastern USA and eastern Canada. Portland, ME.
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December 2005
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Krohn, W. B. April, 2001. Proposed tests for determining factors affecting the distributions of fishers and martens. Annual Meeting of the Northeast Fur Technical Committee, Province, RI.
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September 2001
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Krohn, W. B. April, 2001. Cooperative lynx research at the Maine Cooperative Fish and Wildlife Research Unit. Meeting held with Region 5 of the U.S. Fish and Wildlife Servcie at the 57th Northeast Fish and Wildlife Conference, Saratoga Springs, NY.
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April 2001
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Krohn, W. B. "Distributional dynamics of Martes in eastern North America: spaciotemporal analyses of historical patterns, 1699-2001.” Invited presentation at the 5th International Martes Symposium, University of Washington, Seattle.
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September 2009
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Kocik, J.F., Cieri, M., Goulette, G., Manning, J., Renkawitz, M., Sheehan, T., Tierney, D., Welch, L., and Zydlewski, J. (2018) Partitioning the Big Blue Box: A Synthesis of Marine and Estuary Action Team Science. 2018 Atlantic Salmon Ecosystems Forum. January 17. University of Maine, Orono, Maine.
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January 2018
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A major threat to Gulf of Maine (GOM) Atlantic salmon is mortality in the estuary and ocean. The Marine and Estuary Action Team has identified four critical areas of research need: 1) estuary transition for smolts; 2) predation in coastal systems, 3) adult fishing mortality; and 4) climate change related ecosystem shifts.
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Kocik, J., Hawkes, J., Stich, D., Zydlewski, J., Dever, M., and Byron, C. (2014) Migration Timing of Atlantic Salmon Smolts from Penobscot Bay to the Scotian Shelf. 2014 Atlantic Salmon and Their Ecosystems Forum, University of Maine, Orono. January 8.
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January 2014
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Marine survival is a critical factor limiting recovery of Gulf of Maine Atlantic salmon.We used these tracks in conjunction with oceanographic and bioenergetics models to identify probable migration routes of post smolt Atlantic salmon.
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Kocik, J. F., J. P. Hawkes, D. Stich, J. Zydlewski, M. Dever, C. Byron and A. Lamont (2012) Blue Highways: the migration ecology of Atlantic salmon from Maine estuaries to the Scotian Shelf. Oral presentation at the 142nd Annual Meeting of the American Fisheries Society, Minneapolis-St. Paul, MN.
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August 2012
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Kiraly, I.A., Coghlan, S.M.C., Zydlewski, J., and D. Hayes. 2012. Quantifying the structure of fish assemblages in the Penobscot River in order to assess change due to dam removal. Maine Water Conference, Augusta, ME. March 21.
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March 2012
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Kiraly, I.A., Coghlan, S.M.C., Zydlewski, J., and D. Hayes. 2011. Annual update: Quantifying the effects of dam removal on the structure and function of fish assemblages in the Penobscot River. Penobscot River Restoration Trust Annual Meeting, Orono, ME. November 15, 2011.
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November 2011
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Presentation on the community structure in the Penobscot River prior to restoration
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Kiraly, I.A., Coghlan, S.M.C., Zydlewski, J., and D. Hayes. (2012) The structure of fish assemblages in the Penobscot River prior to dam removal. Veazie Salmon Club Meeting: The State of the River, Veazie, ME. January 18. INVITED.
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January 2012
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The structure of fish assemblages in the Penobscot River prior to dam removal.
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Kiraly, I.A., Coghlan, S.M.C., Zydlewski, J., and D. Hayes. (2012) The structure of fish assemblages in the Penobscot River prior to dam removal. Veazie Salmon Club Meeting: The State of the River, Veazie, ME. January 18. INVITED.
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January 2012
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Kiraly, I., Coghlan, Jr., S.M., Zydlewski, J., and Hayes, D. (2011) Quantifying the Effects of Dam Removal on the Structure and Function of Fish Assemblages in the Penobscot River. 141th Annual Meeting of the American Fisheries Society. Seattle, Washington. September 4-9.
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September 2011
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Kazyak, D., Zydlewski, J., and Letcher, B. (2009) Movement and habitat use of brook charr in coastal Maine. 139th Annual Meeting of the American Fisheries Society. Nashville Tennessee. August 30-September 3
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August 2009
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Kazyak, D., Zydlewski, J., and Letcher, B. (2009) Movement and habitat use of brook charr in coastal Maine. 139th Annual Meeting of the American Fisheries Society. Nashville Tennessee. August 30-September 3.
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September 2009
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Kazyak D.C., Zydlewski, J., Letcher, B.(2010) Movement and growth of brook charr (Salvelinus fontinalis) in coastal Maine. 140th Annual Meeting of the American Fisheries Society. Pittsburgh, Pennsylvania. September 13-16.
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September 2010
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Katz, L., Coghlan, Jr., S., Kinnison, M., York, G., and Zydlewski, J. (2023) Bridle shiner distribution and habitat in Maine: A multi-method approach. 153rd Annual Meeting of American Fisheries Society, Grand Rapids, Michigan. August 20.
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August 2023
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Bridle Shiner populations have faced steep declines across their native range, and their status in Maine was unknown. The goal of this project was to assess the presence of this species and provide a foundation for future long-term monitoring.
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Katz, L., Coghlan, Jr., S., Kinnison, M., York, G., and Zydlewski, J. (2022) Assessing the Distribution and Abundance of Bridle Shiners in Maine. 152st Annual Meeting of the American Fisheries Society. Spokane, WA.
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August 2022
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Bridle shiners (<i>Notropis bifrenatus</i>) are one of Maine’s native species of freshwater minnow and are listed as a “species of special concern” in the state. The goal of this project is to assess the status of this species and provide a foundation for future long-term monitoring in Maine.
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Katz, L., Coghlan, Jr., S., Kinnison, M., York, G., and Zydlewski, J. (2022) Assessing the Distribution and Abundance of Bridle Shiners in Maine. The Atlantic International Chapter of the American Fisheries Society. Newry, Maine. September 18.
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September 2022
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Assessing the Distribution and Abundance of Bridle Shiners in Maine.
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Joshua Gross Rich (1820-1897): Western Maine Pioneer and Wildlife Writer, Presentation to the Rangeley Lakes Regional Historical Society, Rangeley, ME.
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August 2008
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Johnston, C., Zydlewski, G., Zydlewski,J., Kinnison, M., and Smith, S. (2016) Shortnose sturgeon spawning potential in the Penobscot River after dam removals. Annual meeting of the Maine Cooperative Fish and Wildlife Research Unit, University of Maine, Orono. March 23.
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March 2016
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Shortnose sturgeon in the Penobscot River have yet to be observed spawning. Patterns of movement are discussed.
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Johnston, C., Zydlewski, G., Zydlewski,J., Kinnison, M., and Smith, S. (2016) Shortnose sturgeon spawning potential in the Penobscot River after dam removals. 2016 Atlantic Salmon Ecosystems Forum. January 6-7. University of Maine, Orono, Maine.
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January 2016
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Recently the two lowermost dams were removed from the Penobscot River, Maine, restoring 14 km of diadromous fish habitat. Endangered shortnose sturgeon have been documented foraging and wintering in the Penobscot River but there has been no indication of spawning since monitoring began in 2007. In October 2015, three tagged female shortnose sturgeon were detected on receivers upstream of the previous Veazie Dam site, in the dam head pond at rkm 48, and at rkm 53. This demonstrates that under ce
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Johnston, C., Zydlewski, G., Zydlewski, J., Kinnison, M., Lachapelle, K. and Ames, C. (2017) Shortnose Sturgeon use of the Penobscot River in the first years after dam removal. 147th Annual Meeting of the American Fisheries Society. Tampa, FL. August 20.
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August 2017
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Recent dam removals from the Penobscot River, Maine restored access to freshwater habitat critical for the life cycle of endangered Shortnose Sturgeon.In October 2015 and summer 2016, individuals were documented moving into the reaches made available by the dam removals. These movements suggest that future upstream migrations to spawning habitat in the restored reaches are possible.
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Johnston, C., Zydlewski, G., Kinnison, M., Smith, S., and Zydlewski, J. (2015) What is the spawning potential for shortnose sturgeon (Acipenser brevirostrum) in the Penobscot River after dam removal? An acoustic telemetry and habitat suitability study. 145th Annual Meeting of the American Fisheries Society. Portland Oregon. August 16-20 INVITED.
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August 2015
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Shortnose sturgeon have been documented foraging and wintering in the Penobscot River but there has been no indication of spawning since monitoring began in 2007. Water velocity, depth, and bottom substrate will be incorporated into a spawning habitat suitability model for newly available habitat.
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Johnson, J., Zydlewski J., Hogle,J., Brunzell, J., Hudson, M. Coastal Cutthroat Trout Life History Strategies in Abernathy Creek and Chinook River, Washington, Two Tributaries of the Columbia River. Abstract and Presentation at the Oregon Chapter of the American Fisheries Society Annual Meeting, February 16-18,2005 Corvallis, Oregon.
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February 2005
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Johnson, J., Baumsteiger, J., Zydlewski, J., Hudson, M. and Ardren, W. (2008) Genetic Analysis of Sympatric Sea-run and Resident Coastal Cutthroat Trout in the Columbia River. Western Division iof the American Fisheries Society. Portland, Oregon June.
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January 2008
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Job, K., and Zydlewski, J. (2016) Using otolith microchemistry to infer life history and habitat use of American shad in the Penobscot River, Maine. Annual meeting of the Maine Cooperative Fish and Wildlife Research Unit, University of Maine, Orono. March 23.
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March 2016
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Removals of Veazie and Great Works Dams were completed by 2013 in conjunction with upstream fish passage modifications projects as part of the Penobscot River Restoration Project.We used otolith micro-chemical analysis to infer life history patterns in these fish prior to range expansion.
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Job, K., Zydlewski, J., and Schaffler, J. (2018) Using otolith microchemistry to infer habitat use of American shad prior to dam removal in the Penobscot River, Maine. 2018 Atlantic Salmon Ecosystems Forum. January 17. University of Maine, Orono, Maine.
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January 2018
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Prior to 2013, upstream passage of American Shad through the lowest dam (Veazie) was extremely poor, limiting spawning - and juvenile rearing - to 15 km of estuarine habitat. In order to understand how dam removals may influence juvenile estuarine use, we used microchemical analysis of otoliths.
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Job, K., Schaffler, J., and Zydlewski, J. (2018) Using otolith microchemistry to infer habitat use of American shad, Atlantic tomcod, and American eel prior to and following dam removals in the Penobscot River, Maine. Maine Cooperative Fish and Wildlife Research Unit Cooperator’s Meeting, March 22. University of Maine, Orono.
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March 2018
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American shad in the Penobscot River have been contrained to the lower estuary for more than a century. We are using otolith microchemistry to inform life history patterns.
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Job, K., Schaffler, J., and Zydlewski, J. (2018) Estuarine habitat use and spawning demographics of American Shad in the Penobscot River before dam removal. 148th Annual Meeting of the American Fisheries Society. Atlantic City, New Jersey. August 20.
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August 2018
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Since the early 20th century, passage by American shad past Veazie Dam (rkm 48) was biologically trivial. The general pattern of salinity use by juveniles has remained qualitatively unchanged post dam removal, likely reflective of low upstream recruitment.
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Job, K., Schaffler, J., and Zydlewski, J. (2017) Using Otolith Microchemistry to Infer Habitat Use of American Shad and American Eel Prior to Dam Removal in the Penobscot River, Maine Annual meeting of the Maine Cooperative Fish and Wildlife Research Unit, University of Maine, Orono. March 22.
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March 2017
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We used otolith microchemistry to infer the degree to which juvenile shad utilize the freshwater and saline habitats prior to and following, the removal of Veazie and Great Works Dams. Preliminary data indicate complex patterns of habitat use in this spatially restricted population of American Shad.
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Job, K., Schaffler, J., and Zydlewski, J. (2017) Using Otolith Microchemistry to Infer Habitat Use of American Shad Prior to Dam Removal in the Penobscot River, Maine. 147th Annual Meeting of the American Fisheries Society. Tampa, FL. August 20.
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August 2017
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We used otolith microchemistry to infer the degree to which juvenile shad utilize the freshwater and saline habitats prior to and following, the removal of Veazie and Great Works Dams. Preliminary data indicate complex patterns of habitat use in this spatially restricted population of American Shad.
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Job, K., Schaffler, J., and Zydlewski, J. (2016) Using otolith microchemistry to infer life histories and American shad habitat use in the Penobscot River, Maine. Maine146th Annual Meeting of the American Fisheries Society. Kansas City, MO. August 23.
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August 2016
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Removals of Veazie and Great Works Dams were completed by 2013 in conjunction with upstream fish passage modifications projects as part of the Penobscot River Restoration Project. Otolith microchemical data will be used to infer patterns of salinity experience in this spatially restricted population prior to re connection with upriver habitat following dam removal.
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Izzo, L., and Zydlewski, J. (2015) Growth of Atlantic Salmon in Downeast Maine: Using Historic Scales to Examine Trends Over 68 Years 145th Annual Meeting of the American Fisheries Society. Portland Oregon. August 16-20 INVITED.
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August 2015
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In 2000, the Gulf of Maine Distinct Population Segment (GOM DPS) of Atlantic Salmon was listed as endangered under the federal Endangered Species Act in eight rivers in Maine. Scales from over 6,000 individual fish will be examined to estimate age, smolting age, size at smolting, size at return, growth over time, and growth differences.
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Izzo, L., and Zydewski, J. (2015). Post-restoration movements of upstream migrating adult Atlantic salmon in the lower Penobscot River. University of Maine Graduate Research Exposition, University of Maine, Orono. April 2.
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April 2015
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Movements of upstream migrating adult Atlantic salmon in the lower Penobscot River were described. Sites of delay and failure were considered.
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Izzo, L., Maynard, G., and Zydlewski, J. (2015) Post-Dam Removal Movements of Upstream Migrating Adult Atlantic Salmon in the Lower Penobscot River, ME. 145th Annual Meeting of the American Fisheries Society. Portland Oregon. August 16-20 INVITED.
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August 2015
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As part of the Penobscot River Restoration Project , Great Works (rkm 60) and Veazie (rkm 48) Dams were removed from the Penobscot River, ME, making Milford Dam (rkm 62) the first impediment to fish upstream migration. Adult Atlantic salmon were captured at Milford, radio and PIT tagged, and displaced downstream in tidal reaches below the removed dams to track their upstream migration through the lower Penobscot River.
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Izzo, L., Maynard, G., and Zydlewski, J. (2015) Movements of adult Atlantic salmon in the lower Penobscot River after dam removal and fish passage upgrades. NOAA National Hydropower Program Meeting. Gloucester, MA. July 9. INVITED.
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July 2015
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Movements of adult Atlantic salmon in the lower Penobscot River after dam removal and fish passage upgrades were assessed using radio telemetry.
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Izzo, L., Maynard, G., and Zydlewski, J. (2015) Movements of adult Atlantic salmon in the lower Penobscot River after dam removal and fish passage upgrades. 1st Annual University of Maine Freshwater Science Symposium, University of Maine, Orono. January 29.
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January 2015
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Atlantic salmon adult passage was assessed with radio telemetry. Delays and passage efficiencies at dams were considered.
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Izzo, L., Maynard, G., and Zydlewski, J. (2015) Adult Atlantic salmon telemetry study, 2014. Atlantic Salmon Recovery Working Group, NOAA Maine Field Station, Orono, ME. February 13. INVITED.
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March 2015
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Migratory behavior and passage of adult Atlantic salmon tagged in 2014 were presented. Implications were considered.
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Izzo, L., Maynard, G. and Zydlewski, J. (2016) Behavior and Upstream Passage of Atlantic Salmon at the New Milford Fish Lift on the Penobscot River, ME. Annual meeting of the Maine Cooperative Fish and Wildlife Research Unit, University of Maine, Orono. March 23.
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March 2016
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The status of endangered Atlantic salmon in the United States is dismal, with populations in many rivers being entirely or functionally extinct. Fish passage at the lowermost dam is discussed.
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Izzo, L. and Zydlewski, J. (2016) Growth Trends in Two Sea Winter Atlantic Salmon in Maine's Downeast Rivers Over 50 Years. Maine146th Annual Meeting of the American Fisheries Society. Kansas City, MO. August 23.
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August 2016
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The status of endangered Atlantic salmon in the United States is dismal, with populations in many rivers being entirely or functionally extinct. We examined changes in smolt size and ocean growth, specifically during the second year at sea, from the 1950s to the mid-1990s in 2SW Atlantic salmon from Maine's Downeast region.
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Izzo, L. and Zydlewski, J. (2014) Upstream passage of anadromous species in the lower Penobscot River, ME; assessing the Milford fish lift using Dual Frequency Identification Sonar (DIDSON). 144th Annual Meeting of the American Fisheries Society. Québec City, Canada. August 17-21.
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August 2014
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Recent Dam removals leave Milford Dam as the first impediment to fish upstream migration in the Penobscot River. Beginning in 2014, two DIDSON units will be placed inside the lift entrance to continuously monitor fish as they approach, enter, and are passed.
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Izzo, L. and Zydlewski, J. (2014) Upstream passage of anadromous species in the lower Penobscot River; assessing the Milford fish lift using Dual Frequency Identification Sonar (DIDSON). 2014 Atlantic Salmon and Their Ecosystems Forum, University of Maine, Orono. January 8.
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January 2014
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After the removal of the two lowermost dams in the Penobscot River, Milford Dam represents the first anthropogenic impediment to upstream migration. The initiation of an approach to assess the efficacy of the newly modified fish way using a DIDSON is presented.
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Irish, B., and Zydlewski,J. (2015) Marine-derived nutrient cycling in the St.Croix River, Maine. 145th Annual Meeting of the American Fisheries Society. Portland Oregon. August 16-20 INVITED.
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August 2015
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Three fish-ways at main-stem dams on the St. Croix River had been unilaterally closed to diadromous fish passage since the late 1980s by the State of Maine. In order to characterize current food web connections and nutrient limitation prior to alewife return, a food web assessment was initiated.
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Irish, B., Zydlewski, J., and Cunjak, R. (2014) Marine-derived nutrient cycling in the St. Croix River, Maine. 2014 Atlantic Salmon and Their Ecosystems Forum, University of Maine, Orono. January 8.
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January 2014
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Fish passage on the St. Croix River has been closed for decades preventing the successful migration and spawning of alewife in inland waters. This work described the initiation of a study to assess the ecological changes that are anticipated after the recent opening of fish ways.
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Irish, B., Zydlewski, J., and Cunjak R. (2013) Trophic and Marine Interactions in the St Croix River, Maine. Meeting of the International Joint Commission of the St. Croix Waterway, Calais Maine. INVITED June 24.
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June 2013
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Presentation of future work in the St.Croix River.
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Irish, B., Zydlewski J., and Cunjak, R. (2014) Marine-derived nutrient cycling in the St. Croix River, Maine. Presented at: Sustaining the St. Croix Watershed: Research, Partnership and Action. St. Andrews, NB. November 20-21. INVITED.
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November 2014
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Discussed the role of anadromous fish in temperate ecosystems.
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Irish, B., Zydlewski, J. and Cunjak, R. (2014) Marine-derived nutrient cycling in the St. Croix River, Maine. 144th Annual Meeting of the American Fisheries Society. Québec City, Canada. August 17-21.
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August 2014
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Fish ways at main stem dams on the St Croix River had been closed to diadromous fish passage since the late 1980s, but recently reopened. In order to characterize current food web connections and nutrient limitation prior to alewife return, a food web assessment was initiated in 2013.
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Irish B, and Zydlewski, J. Marine-derived nutrient cycling in the St. Croix River, Maine. Annual Meeting of the Maine Cooperative Fish and Wildlife Research Unit. 2015. March 25; Orono, ME.
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March 2015
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Alewife migration in the St Croix River delivers nutrients to fish and invertebrate communities. Stable isotope analysis and nutrient diffusers were used to explore influence.
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Irish B, Zydlewski, J., Cunjak, R. (2015) Marine-derived nutrient cycling in the St. Croix River, Maine. 1st Annual University of Maine Freshwater Science Symposium, University of Maine, Orono. January 29.
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January 2015
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The nutrient delivery of alewife in the St.Croix River was considered. Data using stable isotopes and nutrient diffusers were presented.
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Hugo, D., Zydlewski, J., and Kocik, J. (2021) Using Sensor Fish Transmitters as Proxies for Documenting Downstream Fish Passage Conditions at Low-head Dams. 151st Annual Meeting of the American Fisheries Society. Baltimore, MD. November 6.
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November 2021
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Understanding downstream passage conditions and risks of injury at dams is necessary for effective management.This study provides insight into low-head dam passage conditions without manipulating live fish, illustrating that while some research objectives may still require live specimens, general passage research may be met with sensor fish.
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Hughes, E., Zydlewski, J. and Gorsky, D (2010) Atlantic salmon (Salmo salar) spawning migrations in a controlled river under two transport strategies. 140th Annual Meeting of the American Fisheries Society. Pittsburgh, Pennsylvania. September 13-16.
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September 2010
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Hudson, M, Johnson J, Hogle,J, Brunzell, Zydlewski, J. Adult Coastal Cutthroat Trout Movement and Habitat Use in the Lower Columbia River Presented at the Coastal Cutthroat Trout Symposium: Biology, Status, Management, and Conservation 2005; Fort Worden State Park, Washington
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October 2005
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Hoving, C. L., W. B. Krohn, and D. J. Harrison. April, 2001. Habitat ecology of Canada lynx in eastern North America.Presented to the U.S. Fish and Wildlife Service's Regional Office, Hadley, MA. (Hoving and Krohn presented).
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April 2001
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Hoving, C. L., R. A. Joseph, and W. B. Krohn. Historic distribution of Canada lynx in the Northeast with special reference to Maine. The Interagency Lynx Biology Team Meeting, Orono, ME. (Krohn presented).
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October 2002
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Hoving, C. L., R. A. Joseph, and W. B. Krohn. April, 2001. Historical distribution and reproduction of Canada lynx in Maine. 57th Northeast Fish and Wildlife Conference, Saratoga Springs, NY. (Hoving presented).
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September 2001
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Hoving, C. L., D. J. Harrison, and W. B. Krohn. September, 2001. Multiple-scale habitat relations of Canada lynx in eastern North America. 2001 Annual Meeting of the Northeast Fur Resources Technical Committee. Providence, RI.
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September 2001
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Hoving, C. L., D. J. Harrison, W. B. Krohn, et al. September, 2001. Broad-scale habitat relationships of Canada lynx in eastern North America.Presented at the Eight Annual Conference of The Wildlife Society. Reno, NV. (Hoving presented).
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September 2001
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Hoving, C. L., D. J. Harrison, W. B. Krohn, et al. April, 2001. A probability model of Canada lynx occurrence in eastern North America. 57th Northeast Fish and Wildlife Conference, Satatoga Springs, NY.Poster presentation.
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April 2001
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Hoving, C. L., D. J. Harrison, W. B. Krohn, and W. J. Jakybas. Habitat ecology of Canada lynx in Maine and eastern North America. The Interagency Lynx Biology Team Meeting, Orono, ME. (Harrison presented).
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October 2002
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Hoving, C. L., D. J. Harrison, W. B. Krohn, and W. J. Jakubas. Canada lynx habitat, forest harvest strategies, and forest regeneration in northern Maine. Abstract and presentation at the Carnivore 2002 Meeting, Monterey, CA.
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November 2002
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Hoving, C. L., D. J. Harrison, W. B. Krohn, R. A. Joseph, and M. O'Brien. Climate change and Canada lynx: spatial occurrence models for eastern North America. Poster presented at the Carnivore 2002 Meeting, Monterey, CA.
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November 2002
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Homyack, J. A., D. J. Harrison, and W. B. Krohn. Preliminary results on the effects of precommercial thinning on snowshoe hare. Abtract and poster presented at the Northeast Fish and Wildlife Conference, Portland, ME.
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April 2002
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Homyack, J. A., D. J. Harrison, and W. B. Krohn. Effects of precommercial thinning on snowshoe hares in northern Maine: implication for Canada lynx. Abstract and presentation at the Carnivore 2002 Meeting, Monterey, CA.
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November 2002
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Homyack, J. A., D. J. Harrison, and W. B. Krohn. Effects of precommercial thinning on small mammals in northern Maine. Abstract and presentation at the Northeast Fish and Wildlife Conference, Portland, ME.
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April 2002
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Homyack, J. A., D. J. Harrison, and W. B. Krohn. Effects of precommercial thinning on showshoe hare in northern Maine. Abstract and presentation at the Annual Meeting of The Wildlife Society, Bismark, ND. (Homyack presented).
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September 2002
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Homyack, J. A., D. J. Harrison, W. B. Krohn, A. K. Fuller, and C. L. Hoving. Comparing conservation issues affecting Canada lynx within the northeastern and western U.S. and the Rocky Mountains. Presentation (and abstract) to the Wyoming Chapter of The Wildlife Society. Dubois, WY.
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December 2005
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Homyack, D. J. Harrison, and W. B. Krohn. Effects of precommercial thinning on snowshoe hares in northern Maine: implication for Canada lynx. The Interagency Lynx Biology Team Meeting, Orono, ME. (Homyack presented).
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October 2002
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Holbrook, C., Zydlewski, J., Kinnison, M. (2007) Riverine passage success for pre-spawn adult Atlantic salmon in the Penobscot River. 137th Annual Meeting of the American Fisheries Society. San Francisco, CA. September 2-6.
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September 2007
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Holbrook, C., Zydlewski, J., Kinnison, M. (2007) Assessments of migrating Atlantic salmon (Salmo salar) smolts in the Penobscot River using acoustic telemetry. 137th Annual Meeting of the American Fisheries Society. San Francisco, CA. September 2-6.
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September 2007
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Holbrook, C., J. Zydlewski, and M. Kinnison (2008) Effects of hydroelectric dams on survival and behavior of migrating Atlantic salmon smolts in the Penobscot River, Maine. Atlantic Salmon Research Forum. Orono, ME. January 8. PRESENTED.
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January 2008
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Hogg,R., Coghlan Jr.,S., and Zydlewski, J. (2012) Barrier removal in Sedgeunkedunk Stream: Sea lamprey recolonization and implications for Atlantic salmon habitat restoration. 2012 Coordinating Committee Meeting of the U.S. Geological Survey, Maine Cooperative Fish and Wildlife Research Unit. Orono, ME. March 20.
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March 2012
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Hogg,R., Coghlan Jr.,S., and Zydlewski, J. (2011) Barrier Removal in Sedgeunkedunk Stream: Sea Lamprey Recolonization and Implications for Atlantic Salmon Habitat Restoration. Penobscot Valley Audubon Chapter, Inez Boyd Environmental Research Award at Bangor Public Library, Podium Presentation, May 12.
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May 2011
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Hogg,R., Coghlan Jr.,S., and Zydlewski, J. (2011) Barrier Removal in Sedgeunkedunk Stream: Sea Lamprey Recolonization and Implications for Atlantic Salmon Habitat Restoration. 2011 Coordinating Committee Meeting of the U.S. Geological Survey, Maine Cooperative Fish and Wildlife Research Unit. Orono, ME. April 12.
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April 2011
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Hogg, R., Coghlan, S., Zydlewski, J., Simon, K., Gardner, C., Ratten, S. (2010) Barrier removal in Sedgeunkedunk Stream: Sea lamprey recolonization and implications for Atlantic salmon habitat restoration. 140th Annual Meeting of the American Fisheries Society. Pittsburgh, Pennsylvania. September 13-16.
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September 2010
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Hogg, R., Coghlan Jr., S., Zydlewski, J., and Simon, K. (2015) Fish Community Response to a Small-Stream Dam Removal in a Maine Coastal River Tributary. Guest Lecture: Principles of Fish and Wildlife Conservation (FW 251), Eastern Oregon University, La Grande, OR. February 23. INVITED.
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February 2015
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The response of a fish community to dam removal is presented. Patterns and time courses are discussed.
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Hogg, R., Coghlan Jr., S., Zydlewski, J., and Simon, K. (2014) Anadromous Sea Lampreys Recolonize a Maine Coastal River Tributary After Dam Removal: Ecosystem Engineers? Oregon Chapter American Fisheries Society Annual Meeting, Eugene, OR. February 27.
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February 2014
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Recolonization of a river by sea lamprey after dam removal is presented. Implications for anadromous fishes are discussed.
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Hogg, R., Coghlan Jr., S., Zydlewski, J., and Gardner, C. (2012) Barrier removal in Sedgeunkedunk Stream: Sea lamprey recolonization and implications for Atlantic salmon habitat restoration. 2012 Forum, Atlantic Salmon and their Ecosystems, Bangor Maine January 10-11.
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January 2012
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Hogg, R., Coghlan Jr., S., Zydlewski, J. and Simon, K. (2015) Anadromous Sea Lampreys Recolonize a Maine Coastal River Tributary After Dam Removal: Ecosystem Engineers? 145th Annual Meeting of the American Fisheries Society. Portland Oregon. August 16-20.
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August 2015
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Migrating lampreys were marked with PIT‐tags and their activity was tracked with daily surveys in a restored stream. Data suggest that spawning‐phase Sea Lampreys are ecosystem engineers.
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Historical Ecology of the White-tailed Deer in Maine. The Munsungan Workshop on Deer Wintering Areas in Maine, Maine Cooperative Forestry Research Unit, Stillwater, ME.
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December 2007
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Hickox, E., Frechette, D., and Zydlewski, J. (2023) Upstream and downstream dam passage of adult Alewife on the St. Croix River. 153rd Annual Meeting of American Fisheries Society, Grand Rapids, Michigan. August 20.
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August 2023
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We investigated Alewife behavior and dam passage using radio telemetry to inform future passage design decisions. To track upstream migration, adults were electrofished downstream of Woodland Pulp and Grand Falls dams, and gastrically tagged, released, and tracked during their ascent in 2022 and 2023 (n=230 and n=250 respectively).
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Hickox, E., Frechette, D., and Zydlewski, J. (2024) Approach and passage of adult alewife at two dams on the St. Croix River. 154th Annual Meeting of American Fisheries Society, Honolulu, Hawai’i. September 15.
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September 2024
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We investigated Alewife behavior and dam passage using radio telemetry to inform future passage design decisions. To track upstream migration, adults were electrofished downstream of Woodland Pulp and Grand Falls dams, gastrically tagged, released, and tracked during their ascent in 2022 and 2023
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Hickox, E., Frechette, D., and Zydlewski, J. (2022) Alewife approach and passage at Woodland and Grand Falls dams on the St.Croix River. The Atlantic International Chapter of the American Fisheries Society. Newry, Maine. September 18.
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September 2022
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Alewife approach and passage at Woodland and Grand Falls dams on the St.Croix River.
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Hickox, E., J. Zydlewski, D. Frechette. 2022. Alewife approach and passage at Woodland & Grand Falls Dams. International St. Croix River Watershed Board and Partners Meeting. St. Andrews, New Brunswick. October 27.
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October 2023
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Alewife approach and passage at Woodland & Grand Falls Dams
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Heres, B., Zydlewski, J., and Blomberg, E. (2018) Survival and delay of American eel (Anguilla rostrata) through two hydroelectric dams on the Penobscot River, Maine. 2018 Atlantic Salmon Ecosystems Forum. January 17. University of Maine, Orono, Maine.
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January 2018
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Hydroelectric dams can cause high mortality or injury for adult downstream migrating American eels (Anguilla rostrata). In the Penobscot River, Maine, USA, survival and delays at two main-stem dams were assessed using acoustic telemetry.
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Heres, B., Blomberg, E., and Zydlewski, J. (2017) Survival of Downstream Migrating Adult American Eel through the Penobscot River, Maine. 147th Annual Meeting of the American Fisheries Society. Tampa, FL. August 20.
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August 2017
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Hydroelectric dams can be a site of high mortality or injury for adult downstream migrating American eels . We used acoustic telemetry to estimate downstream survival through West Enfield (rkm 99) and Milford (rkm 62) dams.
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Heres, B., Blomberg, E., and Zydlewski, J. (2017) Forecasting Downstream Migration of American Eel Annual meeting of the Maine Cooperative Fish and Wildlife Research Unit, University of Maine, Orono. March 22.
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March 2017
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Hydroelectric dams can be a site of high mortality or injury for adult downstream migrating American eels . We used acoustic telemetry to estimate downstream survival through West Enfield (rkm 99) and Milford (rkm 62) dams
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Hawkes, J., Kocik, J., Zydlewski, J., Stich, D., Sheehan,T., Goulette, G., and Renkawitz, M. (2018) Atlantic salmon: Assessments through the estuary and beyond. Salmon Ocean Ecology Meeting. February 27., Newport, Oregon.
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February 2018
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Low marine survival is a major hurdle to the recovery and persistence of the Gulf of Maine Atlantic salmon Distinct Population Segment (GOM DPS). Efforts the last two decades (e.g., analysis of historic tagging data, in-river trapping, diet analysis, telemetry) have characterized a suite of risks incurred during seaward and early marine migration.
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Harrison, D. J., and W. B. Krohn. Relationships among partial harvesting, snowshoe hare, Canada lynx, and forest harvesting: a survey of research activities at the University of Maine and Maine Cooperative Fish and Wildlife Research Unit. National Lynx Biology Team Meeting. Minneapolis, MN.
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August 2005
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Harrison, D. J., and W. B. Krohn. Predicting responses of snowshoe hares and Canada lynx to alternative forest harvesting scenarios: a progress report. National Council for Air and Stream Improvement. Kingfield, ME.
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August 2005
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Harrison, D. J., W. B. Krohn, S. Scott, A. K. Fuller, L. Robinson, and C. L. Hoving. Stand-scale management to increase hare and lynx use of managed forests.? Invited presentation at a workshop on Bridging Science and Stewardship sponsored by the Maine Cooperative Forestry Research Unit, Brewer, ME.
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May 2008
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Harrison, D. J., W. B. Krohn, L. Robinson, A. K. Fuller, and C. L. Hoving. Multi-scalar habitat preference of snowshoe hares: how does a prey species coexist with a specialist predator. Presented to the International Union of Game Biologists, Uppsala, SWEDEN. (Harrison presented).
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August 2007
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Harrison, D. J., W. B. Krohn, L. L. Robinson, S. Scott, A. K. Fuller, and C. L. Hoving. Temporal and spatial variation in snowshoe hare densities in eastern North America: relationships to lynx and forest management. Canada Lynx on the Border: Biological and Political Realities for Conservation Planning. International Workshop Organized by the University of Minnesota, Grand Portage, MN. (Harrison presented).
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October 2007
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Harrison, D. J., W. B. Krohn, A. K. Fuller, J. A. Homyack, and L. Robinson. An overview of snowshoe habitat ecology in the Acadian forests of eastern North America. Meeting of the Interagency (Federal) Lynx Biology Group, Duluth, MN.
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October 2006
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Harrison, D. J., J. A. Homyack, J. A. Litvaitis, and W. B. Krohn. Quantifying densities of snowshoe hares in Maine using pellet plots. Wildlife Management Institute's Eastern Lynx Workshop, North Conway, NH.
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January 2004
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Harrison, D. J., J. A. Homyack, A. K. Fuller, and W. B. Krohn. Effects of precommercial thinning and partial harvesting on snowshoe hares in Maine. Wildlife Management Institute's Eastern Lynx Workshop, North Conway, NH.
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January 2004
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Harrison, D. J., C. L. Hoving, and W. B. Krohn. Distribution and extent of Canada lynx habitat in eastern North America from GIS modeling. Wildlife Management Institute's Eastern Lynx Workshop, North Conway, NH.
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January 2004
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Harrison, D. J., A. K. Fuller, J. A. Homyack, and W. B. Krohn. How do clearcutting, precommercial thinning, and partial harvest influence wildlife habitats? Worjkshop on Managing Fiber Prodcution, Wildlife Habitat, and Biodiversity: Latest Results from the Maine Cooperative Forestry Research Unit. Plum Creek Timber Company, Fairfield, ME.
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December 2003
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Harrison, D. J. and W.B. Krohn. 2010. Ongoing research efforts to link landscape conservation with wildlife habitat planning on commercial forestlands in northern Maine. Invited Presentation to Directors of Resource Conservation, Wildlife, and Planning at the Maine Department of Inland Fisheries and Wildlife, Augusta.
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June 2010
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Guyette,M., Loftin, C., Zydlewski, J. (2011) Effects of marine-derived nutrients on juvenile Atlantic salmon growth and body condition. 141th Annual Meeting of the American Fisheries Society. Seattle, Washington. September 4-9. INVITED.
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September 2011
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Guyette, M.Q., C.S. Loftin, and J. Zydlewski. 2011. Evidence of marine-derived nutrient uptake in Atlantic salmon nursery stream communities, 2011 Maine Water Conference, 16 March, Augusta, ME.
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March 2011
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Guyette, M., Loftin, C.,and Zydlewski, J. (2011) Evidence of marine-derived nutrient uptake in Atlantic salmon nursery stream communities. Presentation for the Project SHARE Quarterly Meeting. Whitneyville, ME. June 9. INVITED.
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June 2011
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Guyette, M., Loftin, C., and Zydlewski, J. (2011) Marine-derived nutrient uptake in Atlantic salmon nursery stream communities. Presentation for the North American Benthological Society Annual Meeting. Providence, RI. May 26.
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May 2011
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Guyette, M., Loftin, C., and Zydlewski, J. (2011) Evidence of marine-derived nutrient uptake in Atlantic salmon nursery stream communities. Presentation for the University of Maine GradExpo. Orono, ME. April 21.
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April 2011
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Guyette, M., Loftin, C., Zydlewski, J. 2012. Marine-derived nutrient uptake in macroinvertebrate communities in Atlantic salmon nursery streams. Presentation for the Society for Freshwater Science Annual Meeting. Louisville, KY. May 24.
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May 2012
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Guyette, M., Loftin, C., Zydlewski, J. 2012. Evidence of marine-derived nutrient uptake in Atlantic salmon nursery stream communities. Presentation for the 2012 Coordinating Committee Meeting of the U.S. Geological Survey, Maine Cooperative Fish and Wildlife Research Unit. Orono, ME. March 20.
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March 2012
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Guyette, M., Loftin, C., Zydlewski, J. (2011) The role of marine derived nutrients delivered by anadromous fish in Penobscot River watershed nursery streams. Presentation for the Maine Bureau of Sea Run Fisheries and Habitat, Department of Marine Resources. Bangor, ME. February 10. INVITED.
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February 2011
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Guyette, M., Loftin, C., Zydlewski, J. (2011) Evidence of marine-derived nutrient uptake in Atlantic salmon nursery stream communities. Maine Water Conference. Augusta, ME. March 16.
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March 2011
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Guyette, M., Loftin, C., Zydlewski, J. (2011) Evidence of marine-derived nutrient uptake in Atlantic salmon nursery stream communities. 2011 Coordinating Committee Meeting of the U.S. Geological Survey, Maine Cooperative Fish and Wildlife Research Unit. Orono, ME. April 12.
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April 2011
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Guyette, M., Loftin, C., Zydlewski, J. (2011) The role of marine derived nutrients delivered by anadromous fish in Penobscot River watershed nursery streams. University of New Brunswick. Fredericton, NB. December 9. INVITED.
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December 2011
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Guyette, M., Loftin, C., Zydlewski, J. (2010) Effects of marine-derived nutrients on water chemistry and macroinvertebrates in Atlantic salmon nursery streams in the Penobscot River watershed, Maine. ASLO-NABS. Santa Fe, New Mexico. June 8.
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June 2010
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Guyette, M., Loftin, C., Zydlewski, J., Saros, J. (2009) Historical records of anadromous fish runs from sediment cores in Penobscot River watershed lakes, Maine. 139th Annual Meeting of the American Fisheries Society. Nashville Tennessee. August 30-September 3.
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September 2009
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Guyette, M., Loftin, C. and Zydlewski, J. (2012) Evidence of marine-derived nutrient uptake in Atlantic Salmon nursery stream communities 2012 Coordinating Committee Meeting of the U.S. Geological Survey, Maine Cooperative Fish and Wildlife Research Unit. Orono, ME. March 20.
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March 2012
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Guyette, M., Loftin C., and Zydlewski, J. (2012) Effects of marine-derived nutrients on juvenile Atlantic salmon (Salmo salar) growth and body condition. 2012 Forum, Atlantic Salmon and their Ecosystems, Bangor Maine January 10-11.
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January 2012
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Guyette, M., C.S. Loftin, and J.Zydlewski. 2011. Evidence of marine-derived nutrient uptake in Atlantic salmon nursery stream communities. Presentation for the 2011 Coordinating Committee Meeting of the U.S. Geological Survey, Maine Cooperative Fish and Wildlife Research Unit. Orono, ME. 12 April. Invited.
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April 2011
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Guyette, M., C.S. Loftin, and J. Zydlewski. 2011. The role of marine derived nutrients delivered by anadromous fish in Penobscot River watershed nursery streams. Presentation for the Maine Bureau of Sea Run Fisheries and Habitat, Department of Marine Resources. Bangor, ME. 10 February. Invited.
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February 2011
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Guyette, M., C.S. Loftin, and J. Zydlewski. 2011. Marine-derived nutrient uptake in Atlantic salmon nursery stream communities. Presentation at the Annual Meeting of the North American Benthological Society, 22-26 May, Providence, RI.
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May 2011
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Guyette, M., C.S. Loftin, and J. Zydlewski. 2011. Evidence of marine-derived nutrient uptake in Atlantic salmon nursery stream communities. Presentation for the Project SHARE Quarterly Meeting. Whitneyville, ME. 9 June. Invited.
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June 2011
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Guyette, M., C.S. Loftin, J.Zydlewski. 2010. The role of marine derived nutrients delivered by anadromous fish in Penobscot River watershed nursery streams. Presentation for the Cunjak Lab, University of New Brunswick. Fredericton, NB. 9 December. Invited.
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December 2010
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Guyette, M., C.S. Loftin, J. Zydleswki. 2011. Effects of marine-derived nutrients on juvenile Atlantic salmon and their communities. Presented at the 21-22 April UMaine Grad Expo, Wells Commons.
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April 2011
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Guyette, M., C. Loftin , J. Zydlewski, and J. Saros. Historical records of anadromous fish runs from sediment cores in Penobscot River watershed lakes, Maine. Annual meeting of the American Fisheries Society, Nashville, TN, 31 August-4 September,
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August 2009
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Guyette, M., Loftin, C., Zydlewski, J. 2012 Marine-derived nutrient uptake in macroinvertebrate communities in Atlantic salmon nursery streams. Society for Freshwater Science Annual Meeting. Lousisville, KY, May 20-24.
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May 2012
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Guyette, M. Loftin, C., Zydlewski, J. 2012. Effects of marine-derived nutrients on juvenile Atlantic salmon (Salmo salar) growth and body condition. Presentation for the Biennial Research Forum: Atlantic Salmon and Their Ecosystems, Bangor, ME. January 10.
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January 2012
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Guyette, M. 2012. Effects of marine-derived nutrients on juvenile Atlantic salmon (Salmo salar) growth and body condition. Presentation for the College of Natural Sciences, Forestry, & Agriculture Graduate Student Research Awards Competition, University of Maine. Orono, ME. February 22, 2012.
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February 2012
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Guy, H., Vogel, S.K., Loftin, C., Zydlewski, J.D. Do state natural resource agencies prioritize DEI messaging? [poster] Maine Cooperative Fish and Wildlife Research Unit Annual Meeting. July 12, 2022. Orono, ME.
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July 2023
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The U.S. Geological Survey’s (USGS) Cooperative Fish and Wildlife Research Units (CRU) program establishes relationships among the USGS, U.S. Fish and Wildlife Service, Wildlife Management Institute, host universities, and state resource agencies. This research focuses on analyzing Unit scientist impacts and outputs by assessing the collaborative networks of the Units and the production of scientific publications as one measure of impact.
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Grote, A.B., Zydlewski, J., Bailey, M.M. (2011) Establishing Baselines for American shad in the Penobscot River. 141th Annual Meeting of the American Fisheries Society. Seattle, Washington. September 4-9.
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September 2011
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Grote, A., Zydlewski, M. Bailey, and J. Hightower. 2012. DIDSON assessment of American shad approaching a hydroelectric dam. 142nd Annual Meeting of the American Fisheries Society, St. Paul, Minnesota, August 19-23, 2012.
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August 2012
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Grote, A., Zydlewski, J., and Bailey, M. (2013) Demography and movements of spawning American shad (Alosa sapidissima) in the Penobscot River, Maine, prior to dam removal. Maine Cooperative Fish and Wildlife Research Unit Annual Meeting, University of Maine, Orono, Maine. INVITED. March 21.
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March 2013
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Assessment of American shad in the Penobscot River prior to restoration activities.
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Grote, A., Zydlewski, J., and Bailey, M. (2012)Exploring the movements of migratory fish in the Penobscot River using DIDSON Technology. 2012 Coordinating Committee Meeting of the U.S. Geological Survey, Maine Cooperative Fish and Wildlife Research Unit. Orono, ME. March 20.
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March 2012
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Grote, A., Zydlewski, J., and Bailey, M. (2012) River American shad: establishing baselines prior to restoration. 2012 Forum, Atlantic Salmon and their Ecosystems, Bangor Maine January 10-11.
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January 2012
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Grote, A., Zydlewski, J., Bailey, M., Lipsky, C. (2010) Who's knocking on the door? Using DIDSON to assess the presence of American shad in the Penobscot River. 140th Annual Meeting of the American Fisheries Society. Pittsburgh, Pennsylvania. September 13-16.
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September 2010
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Grote, A., Bailey, M. and Zydlewski, J. (2011) Fishway Monitoring Using DIDSON: Hydroacoustic Assessment of American Shad at Veazie Dam. 2011 Coordinating Committee Meeting of the U.S. Geological Survey, Maine Cooperative Fish and Wildlife Research Unit. Orono, ME. April 12.
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April 2011
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Grote, A., Bailey, M. and Zydlewski, J. (2011) Establishing Baselines for American Shad in the Penobscot River. Department of Marine Resources, Bangor, Maine. April 14. INVITED.
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April 2011
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Grote, A., Bailey, M. and Zydlewski, J. (2011) Establishing Baselines for American Shad in the Penobscot River Presentation. The Nature Conservancy, Brunswick Maine. March 22. INVITED.
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March 2011
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Goulette, G., Hawkes, J., and Zydlewski J. (2014) When is a smolt not a smolt? Identifying predation in the Penobscot River estuary using acoustic telemetry. Penobscot Watershed Conference, Northport, Maine April 8.
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April 2016
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We used acoustic telemetry to assess migratory patterns of Atlantic salmon smolts. We used pattern changes to infer predation events.
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Goulette, G., Hawkes, J., and Zydlewski J. (2014) When is a smolt not a smolt? Identifying predation in the Penobscot River estuary using acoustic telemetry. 2014 Atlantic Salmon and Their Ecosystems Forum, University of Maine, Orono. January 8.
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January 2014
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Passive acoustic telemetry work on Atlantic salmon smolts in the Penobscot River reveals patterns consistent with predation. Circumstantial evidence was used to estimate the loss of smolts due to inferred predation events.
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Gorsky, D., Zydlewski,J., Basley, D.(2008) Characterizing basic movements and habitat use of lake whitefish (Coregonus clupeaformis) in Clear Lake, Maine. 138th Annual Meeting of the American Fisheries Society. Ottawa, Canada. August 17-21.
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August 2008
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Gorsky, D., Zydlewski,J., Basley, D.(2007) Characterizing movement and habitat use of lake whitefish (Coregonus clupeaformis) in Clear Lake,Maine. 137th Annual Meeting of the American Fisheries Society. San Francisco, CA. September 2-6
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September 2007
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Gorsky, D., Zydlewski, J. and Kling, L. (2008) Intraspecific competition in lake whitefish; the interactive effect of food availability and fish density on growth rates in a laboratory setting. 138th Annual Meeting of the American Fisheries Society. Ottawa, Canada. August 17-21.
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August 2008
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Gorsky, D. and Zydlewski, J (2009) Who is responsible for larval recruitment failure of lake whitefish in Maine? The role of intraguild predation by introduced rainbow smelt. 139th Annual Meeting of the American Fisheries Society. Nashville Tennessee. August 30-September 3.
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September 2009
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Gerth, W., Murphy, C.A., and Arismendi, I. 2022. Caddisflies make mistakes in a dammed river system. Poster presentation to the Oregon Chapter of the American Fisheries Society.
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March 2022
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We found that caddisfly females were diving, apparently to oviposit, in reservoirs. Our findings represent the deepest recorded dives for these taxa and demonstrate how reservoirs can result in behaviors that are not likely to result in viable reproduction.
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Gardner, C., J., Coghlan, S., and Zydlewski, J. (2008) Monitoring changes in resident and anadromous fish communities in Sedgeunkedunk Stream (Penobscot Co., ME) after low head dam removal138th Annual Meeting of the American Fisheries Society. Ottawa, Canada. August 17-21.
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August 2008
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Gardner, C. and Zydlewski, J. (2016) Assessing the influence of imprinting and stocking timing on Atlantic salmon smolt to adult return. Maine146th Annual Meeting of the American Fisheries Society. Kansas City, MO. August 23.
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August 2016
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During migration, Atlantic salmon smolts can incur significant direct or indirect mortality from dams and predation. We investigated two methods of stocking to increase survival, imprinting and trucking, and night release.
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Gardner, C. and Zydlewski, J. (2014) Assessing the influence of stocking location and salinity acclimation in the Penobscot River on smolt to adult returns. 2014 Atlantic Salmon and Their Ecosystems Forum, University of Maine, Orono. January 8.
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January 2014
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The results from a three year study to assess the effect of a novel stocking method will be presented. Plans for a follow up evaluation effort will be described.
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Gardner, C. Coghlan, Jr., S., and Zydlewski, J. (2009) Monitoring changes in resident fish communities and anadromous sea lamprey in Sedgeunkedunk Stream (Penobscot Co., Maine) after low-head dam removal. The Diadromous Species Restoration Research Network Science Meeting - Restoration of Diadromous Fishes and Their Ecosystems: Confluence of Science and Restoration. University of Maine, Orono, Maine. July 22-24.
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July 2009
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Gardner, C. Coghlan, Jr., S., and Zydlewski, J. (2009) Monitoring changes in resident fish communities and anadromous sea lamprey in Sedgeunkedunk Stream (Penobscot Co., Maine) after low-head dam removal. Atlantic International Chapter of the American Fisheries Society, Shelburne New Hampshire, September 20-22.
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September 2009
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Gardner, C. Coghlan, Jr., S., and Zydlewski, J. (2009) Monitoring changes in resident fish communities and anadromous sea lamprey in Sedgeunkedunk Stream (Penobscot Co., Maine) after low-head dam removal. 139th Annual Meeting of the American Fisheries Society. Nashville Tennessee. August 30-September 3.
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September 2009
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Gahagan, B., Bailey, M., Jordaan, A., Nelson, G., Stich, D., and Zydlewski,J. (2022) Build to scale: restoration of alosines hinges on recognizing the obvious. 152st Annual Meeting of the American Fisheries Society. Spokane, WA.
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August 2022
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Anadromous alosines (American Shad [<i>Alosa sapidissima</i>], Alewife [<i>A. pseudoharengus</i>] and Blueback Herring [<i>A. aestivalis]</i>) have been a focus of conservation and restoration efforts for decades, yet few clear success stories exist.Fisheries and restoration professionals have an important role in communicating those choices by providing innovative solutions, building coalitions, and providing honest communication as to the costs and benefits of action versus the <i>status quo<
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Fuller, A. K., D. J. Harrison, and W. B. Krohn. ?Landscape planning initiative for northern Maine using area sensitive umbrella species.? Presentation to the USDA Natural Resources Conservation Service and U.S. Fish and Wildlife Service on workshop on their cooperative Healthy Forest Research Program, Bangor, ME. (Fuller was the presenter).
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July 2008
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Flye, M.E., Sponarski, C.C., McGreavy, B., Strong, A.L. and Zydlewski, J. (2018) Getting Over the Dam: Overcoming institutional barriers to the recovery of Atlantic salmon by navigating the social-science/policy interface. 2018 Atlantic Salmon Ecosystems Forum. January 17. University of Maine, Orono, Maine.
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January 2018
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The Atlantic salmon population in Maine remains critically low despite extensive hatchery supplementation and habitat improvement efforts over the past four decades. We hope to characterize institutional barriers and factors that currently impact Atlantic salmon recovery decision making in Maine.
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Flye, M., Sponarsky, C., Zydlewski, J., McGreavy, B., and Strong, A. (2018) Getting over the dam: Overcoming the barriers to Atlantic salmon recovery by navigating the social science/policy interface. Maine Cooperative Fish and Wildlife Research Unit Cooperator’s Meeting, March 22. University of Maine, Orono.
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March 2018
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Atlantic salmon recovery is hampered by challenging regulatory constraints. We are using social science approaches to identify network and patterns of management action.
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Flye, M., Sponarski, C., and Zydlewski, J. (2024) Beyond Recovery: Assessing human-marine mammal interactions and agency response across the United States. International Association for Society and Natural Resources (IASNR), Cairns, Australia, June 23.
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June 2024
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In collaboration with the National Oceanic and Atmospheric Administration (NOAA), we conducted a mixed-methods research project aimed at characterizing human-marine mammal interactions (HMMI) under NOAA jurisdiction and the current state of agency investment. Interactions with aquatic species have been historically underrepresented in the human wildlife interactions literature, making this research a valuable addition to the broader field.
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Flye, M., Sponarski, C., and Zydlewski, J. (2020) Homeward Bound: Returning Atlantic Salmon to Maine rivers using aquaculture. 150th Annual Meeting of the American Fisheries Society. Columbus, Ohio. August 30.
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August 2020
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The Maine Department of Marine Resources (partner in the collaborative leadership framework- CLF- for salmon management in Maine, along with NOAA, USFWS, and Penobscot Nation) is collaborating with Cooke Aquaculture to apply a novel rearing program aimed specifically at increasing natural spawning. We will work to identify knowledge gaps to aid in public outreach and provide insights into the impacts and opportunities afforded by this rearing approach.
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Flye, M., Sponarski, C., and Zydlewski, J. (2023) Did changing the collaborative governance structure of Atlantic salmon in Maine work? The International Association for Society and Natural Resources (IASNR), Portland, Maine. June 11.
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June 2023
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The DPS has been jointly managed by Federal, State, and Tribal entities under several different governance structures. After the first three years of a new governance structure, we have partnered with managers to conduct an evaluation of the CMS (Collaborative Management Strategy).
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Flye, M., Sponarski, C., Zydlewski, J., and McGreavy, B. (2020) Does leadership have a role in collaborative environmental governance? 2019 Atlantic Salmon Ecosystems Forum. January 14. University of Maine, Orono, Maine.
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January 2020
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While studies have assessed the conditions and structures under which collaborative action occurs, little emphasis has been placed on the role that leadership may play in joint-jurisdictional systems. We used the Atlantic Salmon Recovery Framework as a case study to examine the influence that different types of leadership may have on perceived program efficacy, member buy-in, and lived experience through semi-structured interviews.
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Flye, M., Sponarski, C., Zydlewski, J., and McGreavy, B. (2019) Communication and Collaboration within the Atlantic Salmon Governance Structure of Maine. 2019 Maine Sustainability and Water Conference, Augusta, Maine. March 28.
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March 2019
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The Atlantic Salmon Recovery Framework is responsible for Atlantic salmon management and recovery in Maine. We conducted a communication network analysis to better understand the flow of information and communication between members.
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Flye, M., Sponarski, C., Zydlewski, J., and McGreavy, B. (2019) Communication and Collaboration within the Atlantic Salmon Governance Structure of Maine. 2019 Coordinating Committee Meeting of the U.S. Geological Survey, Maine Cooperative Fish and Wildlife Research Unit. Orono, ME. March 26. (Poster)
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March 2019
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We present data on a network analysis of the governance structure for Atlantic salmon management. These data are being used to inform restructuring.
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Flye, M., Sponarski, C., Zydlewski, J., and McGreavy, B. (2019) Communication and Collaboration within the Atlantic Salmon Governance Structure of Maine 149th Annual Meeting of the American Fisheries Society. Reno Nevada. September 29.
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September 2019
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In 2000 the Gulf of Maine Distinct Population Segment was listed as Endangered under ESA with joint listing authority shared by the NOAA and the USFWS. We used survey results to examine the communication between members of the Atlantic Salmon Recovery Framework through communication network analysis.
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Flye, M., Sponarski, C., Zlatich, A., and Zydlewski, J. (2024) Did changing the governance structure of Atlantic salmon in Maine improve collaborative efficacy? The Atlantic Salmon Ecosystems Forum, University of Maine, Orono, Maine. January 9.
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January 2023
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In 2017, we conducted a communication network analysis of the Atlantic Salmon Recovery Framework (ASRF). The results contributed to the formation of a new collaborative governance structure in 2019, the Collaborative Management Strategy (CMS).
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Flye, M., Sponarski, C., Frechette, D., and Zydlewski, J. (2022) Local perceptions of Atlantic salmon conservation and management in Downeast Maine. 152st Annual Meeting of the American Fisheries Society. Spokane, WA.
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August 2022
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The Collaborative Management Strategy (CMS), the governance structure for Atlantic salmon management in Maine, is collaborating with Cooke Aquaculture to implement a novel rearing program to increase natural spawning. Native smolts will be transferred to coastal net pens and reared to maturation.
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Flye, M., Sponarski, C., Frechette, D., and Zydlewski, J. (2021) Returning Atlantic Salmon to Maine rivers using aquaculture. 151st Annual Meeting of the American Fisheries Society. Baltimore, MD. November 6.
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November 2021
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The Maine Department of Marine Resources (partner in the Collaborative Management Strategy [CMS] for Atlantic salmon management in Maine, along with NOAA, USFWS, and Penobscot Nation) is collaborating with Cooke Aquaculture to apply a novel rearing program aimed at increasing natural spawning.Working with stakeholders, we have developed a sociological questionnaire which has been administered to coastal communities near the proposed net pen site to assess public opinions.
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Flye, M., Sponarski, C., Frechette, D. and Zydlewski, J. (2023) Local perceptions of Atlantic salmon conservation and management in Downeast Maine. The International Association for Society and Natural Resources (IASNR), Portland, Maine. June 11.
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June 2023
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Atlantic salmon managers have partnered with Cooke Aquaculture to apply a novel conservation aquaculture program. Through this exploratory study, we examined differences and similarities in attitudes, beliefs, and knowledge about Atlantic salmon, hatcheries, and aquaculture between property owners in the town where the proposed net pen site would be located, and those in neighboring towns
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Flye, M., Sponarski, C., Zydlewski, J. and Frechette, D. (2022) Public perceptions of Atlantic salmon conservation. 2022 Atlantic Salmon Ecosystems Forum. January 11. University of Maine, Orono, Maine.
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January 2022
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The Maine Department of Marine Resources (partner in the Collaborative Management Strategy [CMS] for salmon management in Maine, along with NOAA, USFWS, and Penobscot Nation) is collaborating with Cooke Aquaculture to apply a novel rearing program aimed at increasing natural spawning.Working with stakeholders, we have developed a sociological questionnaire which has been administered to 900 residents across coastal communities near the proposed net pen site.
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Figueroa-Muñoz, G., Murphy, C., and Zydlewski, J. (2024) Contrasting anadromous and landlocked Alewife interactions with lake food webs. The Atlantic Salmon Ecosystems Forum, University of Maine, Orono, Maine. January 9.
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January 2023
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Recent efforts to recover native anadromous Alewife may return these fish to systems that have been without them for hundreds of years. There are concerns that reintroduction may influence contemporary food webs with high-value non-native cold-water fisheries.
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Figueroa, G., Murphy, C.A., Zydlewski, J. 2024. Understanding PFAS variability in fishes. Society for Freshwater Science Annual Meeting. Philadelphia, PA.
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June 2024
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PFAS compounds are of increasing human health and environmental concern. Even with guidance, variability exists in current fish collection methods, sample sizes, species, and waterbodies sampled within and outside of Maine.
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Fernandes, S., Zydlewski, G.B., Zydlewski,J., Wipplehauser, G., Kinnison, M . (2010) Seasonal Distribution and Movements of Shortnose Sturgeon in the Penobscot River Estuary, Maine. Oral presentation at the Annual meeting of the North American Chapter of the World Sturgeon Conservation Society, Bozeman, MT. September 6-8.
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September 2010
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Fernandes, S., G. Zydlewski, M. Kinnison and J. Zydlewski (2008) Annual movement and migration patterns of Atlantic and shortnose sturgeons in the Penobscot River, ME. Atlantic Salmon Research Forum. Orono, ME. January 8.
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January 2008
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Fedarick, J., Murphy, C.A., Record, S., Roy, A., Perkins, D. One Shell of a Home: Habitat Suitability for Yellow Lampmussel. Presentation to Northeast Association of Fish & Wildlife Agencies. April 21-24 2024, Cape Cod, MA.
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April 2024
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Yellow Lampmussel, or <i>Lampsilis cariosa,</i> is listed as a federal At-Risk species; however, its status varies from apparently secure to extirpated across occupied states and provinces. This study assessed the relationship between <i>L. cariosa</i> presence and potential interacting abiotic and biotic drivers, including climatic variables, hydrologic variables, host fish presence, and other co-occurring mussels to investigate rangewide habitat suitability
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Fedarick, J., Murphy, C.A., Record, S., Roy, A., Perkins, D. 2024. Using museum collections to improve range wide modeling and conservation planning for at-risk mussel species. Presentation to the Society for Freshwater Science Annual Meeting, Philadelphia, PA.
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June 2024
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Freshwater mussel distribution data are siloed within individual agencies and limited to where resources have allowed for surveys. Because our modern data is not comprehensive, we cannot conclude that species exist only where they have been recently found. Our study provides a reproducible method for the reverification and stewardship of freshwater mussel museum records and highlights how museum records can provide unique contributions to our understanding of the range of rare, at-risk species.
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Farrington, S.J., C. Murphy, D. Perkins, and A.H. Roy. 2023. Range-wide ecology, conservation, and research needs for Yellow Lampmussel. Northeast Aquatic Biologists Meeting, 15-17 February 2023, Plymouth, MA.
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February 2023
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The Yellow Lampmussel (YLM), <i>Lampsilis cariosa</i>, is a freshwater mussel that is locally designated as endangered, threatened, or a special status in eight U.S. states and two Canadian provinces. This presentation will summarize the state of the science for Yellow Lampmussel throughout its range with particular attention to the threats, research gaps, and regional differences identified in initial Yellow Lampmussel Working Group meetings.
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Erbland, P., Zydlewski, G., Zydlewski, J., and Hightower, J. (2012) Estimating Penobscot River Fish Passage using Fixed Location SONAR. 2012 Forum, Atlantic Salmon and their Ecosystems, Bangor Maine January 10-11.
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January 2012
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Erbland, P. J., Zydlewski, G.B., Zydlewski, J., Hightower, J.E. (2011) Fixed, Side-Aspect Acoustic Sampling of a Diverse Diadromous Fish Community in a Tidal River. 141th Annual Meeting of the American Fisheries Society. Seattle, Washington. September 4-9.
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September 2011
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Erbland, P. J., G. B. Zydlewski, J. Zydlewski, and J. E. Hightower. 2011. Fixed, side-aspect acoustic sampling of a diverse diadromous fish community in a tidal river. 141th Annual Meeting, American Fisheries Society, Seattle, WA, September 4-8, 2011.
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September 2011
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Eberhardt, E., Gerth, W.J., Murphy, C.A., Konstantinidis, P., Arismendi, I. 2022. Anchors Away! Understanding historical Anchorworm parasitism of introduced warmwater fishes in the Willamette Basin, Oregon. Presentation at Research Advances in Fisheries and Wildlife. Corvallis, OR.
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April 2022
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Parasites are important for fish health and historically understudied. We are working to improve our understanding of the environmental and ecological drivers of anchorworms.
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E. Simons, E., W. Krohn, and D. Harrison. Predicting responses of forest landscape changes on wildlife umbrella species: future projections results for Canada lynx and American marten. Poster presented at the Cooperators’ Meeting, Maine Cooperative Fish and
Wildlife Research Unit, University of Maine, Orono.
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May 2010
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E. Simons, D. J. Harrison, W. B. Krohn, K. Legaard, and S. Sader. ?Landscape indicators of forest biodiversity: Using American marten, Canada lynx, and snowshoe hares to evaluate retrospective trends in habitat supply across northern Maine.? Invited presentation at a workshop on Bridging Science and Stewardship sponsored by the Maine Cooperative Forestry Research Unit, Brewer, ME.
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May 2008
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Dionne, P.E., M.T. Kinnison, G.S. Wippelhauser, J.D. Zydlewski, G.B. Zydlewski. (2009) Outside the box: coastal movements of shortnose sturgeon and implications for management. School of Marine Science Graduate Symposium, Damariscotta, ME. May.
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May 2009
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Dionne, P., Zydlewski, G.B., Wippelhauser, G., Zydlewski, J., Kinnison, M. (2010) Movement Patterns of Shortnose Sturgeon in Coastal Maine Waters. Oral presentation at the Annual meeting of the North American Chapter of the World Sturgeon Conservation Society, Bozeman, MT. September 6-8.
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September 2010
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Dionne, P., Kinnison, M., Wippelhauser, G., Zydlewski, J. and Zydlewski, G. (2009) Outside the Box: Coastal Movements of Shortnose Sturgeon and Implications to Management. The Diadromous Species Restoration Research Network Science Meeting - Restoration of Diadromous Fishes and Their Ecosystems: Confluence of Science and Restoration. University of Maine, Orono, Maine. July 22-24.
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July 2009
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Dionne, P, Kinnison, M., Wippelhauser, G., Zydlewski, J., Zydlewski, G (2009) Outside the box: coastal movements of shortnose sturgeon and implications to management. 139th Annual Meeting of the American Fisheries Society. Nashville Tennessee. August 30-September 3.
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September 2009
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Dillingham, C., and Zydlewski, J. (2022) Using time-to-event models to characterize the impacts of a pool-and-weir fishway on upstream Alewife passage at a recently constructed fishway in Chelsea, ME, USA. 152st Annual Meeting of the American Fisheries Society. Spokane, WA.
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August 2022
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To assess the efficacy of the fishway to pass alewife, a PIT telemetry study is being conducted using returning adults. The study will employ a series of nine PIT antennas, distributed in a manner than will characterize the differential rates of passage between straight- and turn-pools as well as the terminal pool that houses a fish-counting weir.
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Dillingham, C., and Zydlewski, J. (2022) Movement of Alewife around a hydroelectric dam on the Passadumkeag River. 2022 Atlantic Salmon Ecosystems Forum. January 11. University of Maine, Orono, Maine.
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January 2022
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To access spawning habitat in the upper reaches of the Passadumkeag River, a tributary of the Penobscot, migrating alewife must navigate a 70-meter denile-style fishway at the Lowell Tannery hydroelectric project (FERC No. 4202).To assess these components of passage, we captured alewife (n= 80) using a cast net at the base of the dam, tagged (radio and PIT) and released these fish 200m downstream, and monitored reapproach to the dam.
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Dillingham, C., Zydlewski, J., Peterson, E., and Lasley-Rasher, R. (2020) Distribution and abundance of zooplankton in the Penobscot River estuary. 2019 Atlantic Salmon Ecosystems Forum. January 14. University of Maine, Orono, Maine.
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January 2020
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In the Penobscot River estuary, zooplankton are a crucial food source for many organisms such as juvenile shad (<i>Alosa sapidissima</i>) and river herring (Alewife, <i>A. pseudoharengus</i> and Blueback herring, <i>A. aestivalis</i>). To evaluate seasonal variations, sampling was conducted monthly (May to October) during the day and night at (or about) low tide within the same week.
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Dillingham, C., Peterson, E., Zydlewski, J., and Lasley-Rasher, R. (2020) Food for Famished Fish – The Zooplankton of the Penobscot River Estuary. 150th Annual Meeting of the American Fisheries Society. Columbus, Ohio. August 30.
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August 2020
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Zooplankton are a crucial food source for many organisms in the Penobscot River estuary, including juvenile Shad (<i>Alosa sapidissima</i>) and river herring (Alewife, <i>A. pseudoharengus</i> and Blueback Herring, <i>A. aestivalis</i>).To evaluate the dynamics of this population, zooplankton samples were collected at four river transects spanning the salinity gradient in the Penobscot River estuary.
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Dillingham, C., Katz, L., York, G., and Zydlewski, J. (2024) Using multiple methods to assess the response of Sea Lamprey distribution to a major river restoration project in Maine. 154th Annual Meeting of American Fisheries Society, Honolulu, Hawai’i. September 15.
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September 2024
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In 2022-3, we radio tagged sea-run Sea Lamprey and tracked their movements at each mainstem hydropower dam and through each major river tributary upstream of the most seaward dam. In 2023, we also conducted an eDNA) survey to further inform the distribution.
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Dillingham, C., Katz, L., York, G., Kinnison, M., and Zydlewski, J. (2024) Using eDNA surveys to describe sea lamprey and American eel distribution following the Penobscot River Restoration Project. The Atlantic Salmon Ecosystems Forum, University of Maine, Orono, Maine. January 9.
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January 2023
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In the summer of 2023, we conducted eDNA surveys throughout the Penobscot River watershed to describe the current distribution of sea lamprey and American eel. Water samples were collected from 70 sites representing 39 rivers and streams; species-specific genetic markers within those samples were amplified using qPCR to assess presence or absence.
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Dillingham, C., Frechette, D., and Zydlewski, J. (2022) The Return of Native Sea Lampreys to the Penobscot River, Maine, USA. The Atlantic International Chapter of the American Fisheries Society. Newry, Maine. September 18.
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September 2022
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The Return of Native Sea Lampreys to the Penobscot River, Maine, USA.
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Dillingham, C., Blomberg, E., Frechette, D., and Zydlewski, J. (2023) Assessing passage efficacy for Alewife at a state-of-the-art fishway. 153rd Annual Meeting of American Fisheries Society, Grand Rapids, Michigan. August 20.
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August 2023
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Togus Stream, a tributary of the Kennebec River, once had a native run of alewife but the construction of the Lower Togus Pond Dam in 1804 completely extirpated this population.Eight PIT antennas were distributed along the fishway to characterize the fishway’s efficacy for entry and passage.
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Dever, M., Kocik, J., Zydlewski, J., Hebert, D., and Stich, D. (2016) Linkage between coastal conditions and migratory patterns and behavior of Atlantic Salmon smolts along the Halifax Line. 2016 Ocean Sciences Meeting. February 21-26. New Orleans, Louisiana.
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February 2016
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Understanding nearshore migration of Atlantic Salmon is a key to further improve management and conservation of this species. This work presents the movement patterns of Atlantic salmon near Halifax.
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Dever, M., Kocik, J., Zydlewski, J., Hebert, D., and Greenan, B. (2014) Linkage Between coastal conditions and migration of Atlantic Salmon smolts along the Halifax Line. 144th Annual Meeting of the American Fisheries Society. Québec City, Canada. August 17-21.
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August 2014
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Understanding nearshore migration of Atlantic Salmon is a key to further improve management and conservation of this species. This study correlates acoustic detections of Atlantic salmon smolts tagged in the Penobscot
River, and detected along the Halifax Line, with a wide range of co‐ located oceanographic data.
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Danylchuk, A., Letcher, B., Zydlewski, J., Whiteley, A., Dubrieul,T., and Hurley, S. (2011) Movement patterns of brook trout (Salvelinus fontinalis) inhabiting a restored coastal stream in Massachusetts: preliminary evidence of anadromy. 141th Annual Meeting of the American Fisheries Society. Seattle, Washington. September 4-9.
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September 2011
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Damkot, P., Coghlan, Jr., S., and Zydlewski, J. (2009) The influence of riparian forest characteristics on terrestrial invertebrate input and brook trout diet in headwater streams. 139th Annual Meeting of the American Fisheries Society. Nashville Tennessee. August 30-September 3.
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September 2009
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D. J. Harrison, D. J., W. B. Krohn, and S. A. Scott. Effect of Forestry on Snowshoe Hare and Implications for Canada Lynx. Cooperative Forestry Research Unit Workshop, University of Maine, Orono.
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May 2010
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Cory, G. and Zydlewski, J. (2015) Assessing the influence of imprinting and stocking timing in the Penobscot River on smolt to adult returns. Annual meeting of the Maine Cooperative Fish and Wildlife Research Unit, University of Maine, Orono. March 25.
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March 2015
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The effect of imprinting of salmon smolts on smolt to adult returns was tested using a stocking manipulation. No change in return rate was observed.
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Cory, G. and Zydlewski, J. (2015) Assessing the influence of imprinting and stocking timing in the Penobscot River on smolt to adult returns. 1st Annual University of Maine Freshwater Science Symposium, University of Maine, Orono. January 29.
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January 2015
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The influence of imprinting in freshwater was tested using three years of releases of smolts into the Penobscot River. No additional returns were observed in fish given this treatment.
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Coghlan, Jr., S., Zydlewski, J., Hogg, R., Gardner, C., Simon, K., and Saunders, R. (2012) Effects of Dam Removal on Anadromous Fishes, Resident Fishes, and Physical Habitat in a Coastal Maine Stream. Presented at the 2012 Northeastern Natural History Conference, Syracuse, NY April 16
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April 2012
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Coghlan Jr.,S.M., Hogg,R., Zydlewski, J., Simon,K. and Saunders, R. (2011) Barrier removal and range expansion of sea lamprey in the Penobscot River watershed: the importance of habitat conditioning in Atlantic salmon nursery streams. 141th Annual Meeting of the American Fisheries Society. Seattle, Washington. September 4-9.
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September 2011
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Casey, A., Mensinger, M., and Zydlewski, J. (2022) Characterizing White Catfish Movements in the Penobscot River. The Atlantic International Chapter of the American Fisheries Society. Newry, Maine. September 18.
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September 2022
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Characterizing White Catfish Movements in the Penobscot River
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Bredeweg, E., Arismendi, I., Murphy, C.A., Henkel, S. The dark underside of floating solar panels: Iterative runs of CE-QUAL-W2 models as an assessment tool for understanding the effects of floating photovoltaic arrays on reservoir limnology. Presentation to the Oregon Lakes Association Meeting. November 15, 2023. Corvallis, OR.
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November 2023
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Floating solar is highlighted as a land sparing strategy for alternative energy production. It is likely to impact reservoir ecology given potential changes to light and temperature, important for lake processes. We used common reservoir models to assess the potential for changes in reservoir dynamics with floating solar installations.
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Boyd, K., Barber, B., and Zydlewski, J. (2016) Relative abundance and size of zooplankton within the St. Croix Watershed prior to alewife recolonization 72nd Annual Northeast Fish & Wildlife Conference. April 3, 2016. Annapolis, Maryland.
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April 2016
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Fish passages have recently been re-opened at multiple dams on the St. Croix watershed allowing diadromous fish to return to this system after decades of purposeful blockage. As a part of a wider study to characterize the food web, we sampled three lentic sites (Spednic Lake, Woodland Flowage, and Grand Falls Flowage) in the system that are likely to be influenced by the reintroduction of alewife.
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Benson, S., Murphy, C.A., Charney, N., Eggert, S., Fraver, S., Kenefic, L. 2024. Maine’s Secret Clam Flats: The Aquatic Diversity of Northern White-Cedar Forests. Presentation to the Society for Freshwater Science Annual Meeting, Philadelphia, PA.
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June 2024
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Northern white-cedar lowlands in Maine are wetland forest habitats. However, there remains a gap in the literature as to what types of aquatic biodiversity and processes these forests support and how those are impacted by forest management practices.
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Begley, M., Coghlan, Jr., S., and Zydlewski, J. (2015) Understanding Commercial Harvest Impacts on White Suckers in Maine. Annual meeting of the Maine Cooperative Fish and Wildlife Research Unit, University of Maine, Orono. March 25.
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March 2015
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Fishing harvest of suckers was assessed by comparison the lakes with or without commercial harvest. Differences in demography were compared to infer mortality rates.
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Begley, M., Coghlan, Jr., S., and Zydlewski, J. (2015) Understanding Commercial Harvest Impacts on White Suckers in Maine. 1st Annual University of Maine Freshwater Science Symposium, University of Maine, Orono. January 29.
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January 2015
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Commercial harvest of suckers may shift demographics of the population. Data from fished and unfished waters were presented.
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Begley, M., Coghlan, Jr., S., and Zydlewski, J. (2014) Impacts of Commercial Harvest on White Suckers. Maine Department of Inland Fisheries and Wildlife. Bangor, ME. , November 15. INVITED.
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November 2014
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Assessment of the potential role that commercial harvest may have on size and age structure. Methods are presented.
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Begley, M., Coghlan, Jr., S., Zydlewski, J. (2015) Understanding commercial harvest impacts on white suckers in Maine. University of Maine Graduate Research Exposition, University of Maine, Orono. April 2.
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April 2015
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Lakes with and without commercial fishing were compared. Demographic shifts were described to infer mortality rates.
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Begley, M., Coghlan, Jr., S. and Zydlewski, J. (2016) Understanding and Predicting Impacts of Commercial Harvest on White Suckers in Maine.
Maine146th Annual Meeting of the American Fisheries Society. Kansas City, MO. August 23.
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August 2016
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The State of Maine allows the harvest of white suckers, Catostomus commersoni, during their spawning. In order to assess the potential impacts of high rates of commercial exploitation, we constructed a heuristic model of a white sucker population.
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Begley, M., Coghlan, S.,and Zydlewski, J. (2015) Understanding Commercial Harvest Impacts on White Suckers in Maine. 145th Annual Meeting of the American Fisheries Society. Portland Oregon. August 16-20 INVITED.
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August 2015
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The state of Maine harvests white suckers, Catostomus commersonii, to provide lobster bait for coastal communities in early spring. Data will be used to compare lakes open and closed to harvest to infer white sucker sensitivity to commercial harvesting.
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Barrie, A., Loftin, C. and Zydlewski, J. 2016. Changes in fish assemblages and chimpanzee communities after completion of the Bumbuna hydroelectric dam, northern Sierra Leone, West Africa. Annual meeting of the Maine Cooperative Fish and Wildlife Research Unit, University of Maine, Orono. March 25.
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March 2016
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The Bumbuna project in Sierra Leone impounded nearby land. Information about resulting changes in fish and chimpanzee communities will inform future fisheries and wildlife management in the project area.
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Barrie, A., Loftin, C. and Zydlewski, J. 2016. Changes in fish assemblages after completion of the Bumbuna hydroelectric dam, northern Sierra Leone, West Africa. Annual meeting of the Maine Cooperative Fish and Wildlife Research Unit, University of Maine, Orono. March 25.
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March 2016
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The Bumbuna project in Sierra Leone impounded nearby land. Information about resulting changes in fish and chimpanzee communities will inform future fisheries and wildlife management in the project areas.
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Barrie, A., Loftin, C. and Zydlewski, J. (2015). Influence of dam construction on chimpanzee distribution, abundance, and nest characteristics in the Bumbuna Hydroelectric Project, Northern Sierra Leone, West Africa. Annual meeting of the Maine Cooperative Fish and Wildlife Research Unit, University of Maine, Orono. March 25.
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March 2015
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The Bumbuna project in Sierra Leone impounded nearby land. Changes in chimpanzee habitat use was considered.
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Barrie, A., Loftin, C. and Zydlewski, J. (2015) Changes in fish assemblages after completion of the Bumbuna hydroelectric dam, northern Sierra Leone, West Africa. Annual meeting of the Maine Cooperative Fish and Wildlife Research Unit, University of Maine, Orono. March 25.
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March 2015
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The Bumbuna project in Sierra Leone impounded nearby land. Changes in fish community was considered.
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Barrie, A., Loftin, C. and Zydlewski, J. (2014) Changes in fish assemblages after completion of the Bumbuna hydroelectric dam on the Seli –Rokel River in Sierra Leone, West Africa. 144th Annual Meeting of the American Fisheries Society. Québec City, Canada. August 17-21.
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August 2014
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The Bumbuna hydroelectric dam is a run-of-river facility on the Seli/Rokel River 200km northeast of Freetown, Sierra Leone. We documented changes in the fish community in the river as part of a comprehensive assessment of the project’s effects.
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Barrie, A., C.S. Loftin, and J. Zydlewski. 2015. Conservation status of western chimpanzee (Pan troglodytes verus) in the Bumbuna hydroelectric project, northern Sierra Leone, following impoundment by the dam. 6th annual SCCS-NY meeting of the American Museum of Natural History's Center for Biodiversity and Conservation, New York, NY, 7-9 October.
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October 2015
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The Bumbuna hydroelectric dam is a run-of-river facility on the Seli/Rokel River 200km northeast of Freetown, Sierra Leone. We documented response of chimpanzees in the area surrounding and impounded by the dam as part of a comprehensive assessment of the project’s effects.
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Barber, B., and Zydlewski, J. (2016) Alewife (Alosa pseudoharengus) as Marine-Derived Nutrient Subsidies in Two Northeast Maine Rivers. Annual meeting of the Maine Cooperative Fish and Wildlife Research Unit, University of Maine, Orono. March 23.
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March 2016
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Three fish-ways at main-stem dams on the St. Croix River had been unilaterally closed to diadromous fish passage since the late 1980s by the State of Maine. How changes in passage efficiency at three main stem might influence the population dynamics of the alewife run, and how these dynamics in turn may influence the flow and distribution of nutrients in the watershed were discussed.
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Barber, B., and Zydlewski, J. (2016) Alewife (Alosa pseudoharengus) as Marine-Derived Nutrient Subsidies in Two Northeast Maine Rivers. 2016 Atlantic Salmon Ecosystems Forum. January 6-7. University of Maine, Orono, Maine.
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January 2016
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We used stable isotopes and nutrient diffusers to infer both trophic level and influence of marine derived nutrients in systems with and without strong alewife runs. Comparisons of data from the two systems will be presented.
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Barber, B., Gibson, J., and Zydlewski, J. (2017) Marine-Derived Nutrient Cycling in the St. Croix River, Maine Annual meeting of the Maine Cooperative Fish and Wildlife Research Unit, University of Maine, Orono. March 22.
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March 2017
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Migrating adult alewife are a source of marine-derived nutrients on the east coast of North America, importing N and P into freshwater habitats. We developed a deterministic model to explore the theoretical nutrient dynamics of alewife migrations at differing spawner abundances.
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Barber, B., Gibson, J., and Zydlewski, J. (2017) Does what go up also come down? Balancing recruitment with nutrient budget for alewife. 147th Annual Meeting of the American Fisheries Society. Tampa, FL. August 20.
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August 2017
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Migrating adult alewife are a source of marine-derived nutrients on the east coast of North America, importing N and P into freshwater habitats. We developed a deterministic model to explore the theoretical nutrient dynamics of alewife migrations at differing spawner abundances.
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Barber, B., Gibson, J., O’Malley, A., and Zydlewski, J. (2019) Exploring how a range of management objectives could affect alewife population recovery. 2019 Maine Sustainability and Water Conference, Augusta, Maine. March 28.
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March 2019
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Many alewife populations in Maine have experienced recent increases in spawner abundance. We developed a population model using best available regional data to explore the theoretical influence of management actions in the St. Croix River.
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Barber, B., Gibson, J., O’Malley, A., and Zydlewski, J. (2019) Exploring how a range of management objectives could affect alewife population recovery. 2019 Coordinating Committee Meeting of the U.S. Geological Survey, Maine Cooperative Fish and Wildlife Research Unit. Orono, ME. March 26. (Poster)
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March 2019
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Alewife runs bring critical nutrients into freshwater systems. We model hos passage may influence the ecology of river systems.
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Barber, B., Gibson, J., O’Malley, A., and Zydlewski, J. (2018) Marine-Derived Nutrient Cycling in the St. Croix River, Maine. Maine Cooperative Fish and Wildlife Research Unit Cooperator’s Meeting, March 22. University of Maine, Orono.
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March 2018
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Alewife have been blocked from accessing spawning habitat in the St Croix River. We are using modeling and stable isotopes to understand their recolonization patterns.
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Barber, B., Gibson, J., O’Malley, A., and Zydlewski, J. (2018) Exploring how a range of management objectives could affect alewife population recovery. 148th Annual Meeting of the American Fisheries Society. Atlantic City, New Jersey. August 20.
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August 2018
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Many alewife populations in Maine have experienced recent increases in spawner abundance. To inform management practices for alewife recovery, we developed a population model using best available regional data to explore the theoretical influence of specific management actions in the St. Croix River.
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Barber, B., Gibson, J., Molina Moctezuma, A., and Zydlewski, J. (2019) A tool for understanding likely fish passage and harvest management outcomes for alewife on the St. Croix River, Maine. IJC St. Croix Board & Partners Meeting. St. Stephen, New Brunswick, Canada. June 4.
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June 2019
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Alewife populations are increasing in the St Croix River. We developed an on line tool to explore the theoretical population response to changing fish passage.
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Barber, B., Gibson, J., Molina Moctezuma, A., and Zydlewski, J. (2018) A tool for understanding likely fish passage and harvest management outcomes for alewife on the St. Croix River, Maine. 148th Annual Meeting of the American Fisheries Society. Atlantic City, New Jersey. August 20.
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August 2018
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Large spawning populations of anadromous alewives were historically found in the St. Croix River, Maine. We are developing a user friendly, web-based management tool that will allow managers and stakeholders to weigh the theoretical pros and cons of specific scenarios.
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Barber, B. and Zydlewski, J. (2016) How changes in passage efficiency of alewife at main stem dams can influence nutrient dynamics in the St. Croix River, ME. Maine146th Annual Meeting of the American Fisheries Society. Kansas City, MO. August 23.
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August 2016
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Three fish-ways at main-stem dams on the St. Croix River had been unilaterally closed to diadromous fish passage since the late 1980s by the State of Maine. A model was developed to determine how changes in passage efficiency at three main stem might influence the population dynamics of the alewife run, and how these dynamics in turn may influence the flow and distribution of nutrients in the watershed.
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Barber, B. and Zydlewski , J. (2016) Marine-Derived Nutrient Cycling in the St. Croix River, Maine. International St. Croix River Watershed Board Meeting Calais, Maine June 14
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June 2016
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The work modeled the recovery of alewife in the St Croix River. The results indicate passage at the second dam (Woodland) is a limitation for recovery.
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Bailey, M., Zydlewski,J.,and Hawkes, J. (2009) Evaluation of passage success of Atlantic salmon smolts through the Penobscot River and Estuary, Maine
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January 2009
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Bailey, M., Zydlewski, J., Grote, A. (2012) DIDSON Assessment of Fish Approaching an Hydroelectric Dam. Oral presentation at the Atlantic International Chapter of the American Fisheries Society, Averill, VT. September 23, 2012.
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September 2012
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Assessment of Fish Approaching an Hydroelectric Dam.
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Bailey, M., Grote, A. and Zydlewski, J. (2010) American shad in the Penobscot River: Choosing recovery tools. 140th Annual Meeting of the American Fisheries Society. Pittsburgh, Pennsylvania. September 13-16.
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September 2010
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Bailey, M. and Zydlewski, J. (2011) Downstream .Success and Survival for Out-migrating Atlantic Salmon Smolts in the Penobscot River. 67th Northeast Fish and Wildlife Conference, Manchester, New Hampshire, April 17
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April 2011
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Bailey, M. and Zydlewski, J. (2011) American shad in the Penobscot River: choosing management tools. 67th Northeast Fish and Wildlife Conference, Manchester, New Hampshire, April 17.
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April 2011
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Bailey, M. and Zydlewski, J. (2010) Multi-state models of downstream migrating Atlantic salmon smolts in the Penobscot River. 140th Annual Meeting of the American Fisheries Society. Pittsburgh, Pennsylvania. September 13-16.
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September 2010
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Bahn, V., R. J. O'Connor, and W. B. Krohn. The role of dispersal in shaping bird distribtuions. Meeting of the American Ornithologists' Union and Society of Canadian Ornithologists. Laval University, Quebec City, Quebec, CANADA.
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August 2004
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Bahn, V., R. J. O'Connor, and W. B. Krohn. Model selection for species distribution models incorporating spatial autocorrelation. Abstract and presentation to the Northeast Fish and Wildlife Conference, Newport, RI.
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April 2003
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Atkinson, E., and Zydlewski, J. (2022) Applying Dispersal Patterns to Identify Optimal Egg Planting Locations for Atlantic Salmon in Eastern Maine, USA. 152st Annual Meeting of the American Fisheries Society. Spokane, WA.
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August 2022
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The Gulf of Maine Distinct Population Segment of Atlantic salmon has suffered from habitat loss and exploitation over the last century. Egg planting maximizes wild rearing opportunities which can be important for adaptation.
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Atkinson, E., and Zydlewski, J. (2020) Examining dispersal of point stocked Atlantic salmon (Salmo salar) fry relative to habitat qualities in streams in eastern Maine, USA. 2019 Atlantic Salmon Ecosystems Forum. January 14. University of Maine, Orono, Maine.
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January 2020
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The Gulf of Maine Distinct Population Segment of Atlantic salmon has suffered from habitat loss and exploitation over the last century. Hatchery supplementation has unquestionably prevented the extirpation of the species over the last decades, but risks domestication effects. Egg planting and fry stocking replicate the natural spawning process in streams and provide a natural experience which can be important maintaining wild traits.
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Atkinson, E., and Zydlewski, J. (2020) A tool to optimize egg planting of Atlantic salmon using habitat quality and dispersal patterns. 150th Annual Meeting of the American Fisheries Society. Columbus, Ohio. August 30.
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August 2020
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Egg planting maximizes wild rearing opportunities which can be important for adaptation.These data are being used to develop a tool to optimize selection based on the area to be stocked, the number of eggs available, and the ease of access.
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Atkinson, E., and Zydlewski, J. (2019) Examining dispersal of point stocked Atlantic salmon fry relative to habitat qualities in streams in eastern Maine, USA.149th Annual Meeting of the American Fisheries Society. Reno Nevada. September 29.
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September 2019
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The Gulf of Maine Distinct Population Segment of Atlantic salmon has suffered from habitat loss and exploitation over the last century. Results of this study will inform decisions related to stocking intervals, habitat use, and stocking rates.
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Atkinson, E. and Zydlewski, J. (2021) Using dispersal data to optimize egg planting strategies for Atlantic Salmon. 151st Annual Meeting of the American Fisheries Society. Baltimore, MD. November 6.
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November 2021
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Hatchery supplementation has unquestionably prevented the extirpation of Atlantic salmon, but stocking methods represent tradeoffs between survival, domestication and logistics. We sought to develop an optimization tool that would allow managers to best select the number of eyed egg batches and their planting locations within a drainage targeted for supplementation.
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Atkinson, E. and Zydlewski, J. (2019) Optimizing strategies to hydraulically plant Atlantic salmon eggs based on fry dispersal patterns. 2019 Maine Sustainability and Water Conference, Augusta, Maine. March 28.
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March 2019
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Egg planting is a process by which fertilized eggs from the hatchery are injected into the gravel in the fall, replicating the natural spawning process in streams and provides a natural experience which can be important for adaptation. We propose to characterize the dispersal pattern of egg planted Atlantic salmon as a function of habitat and use these data to construct a GIS based tool to inform stocking.
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Atkinson, E. and Zydlewski, J. (2019) Optimizing strategies to hydraulically plant Atlantic salmon eggs based on fry dispersal patterns. 2019 Coordinating Committee Meeting of the U.S. Geological Survey, Maine Cooperative Fish and Wildlife Research Unit. Orono, ME. March 26. (Poster)
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March 2019
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Atlantic salmon are endangered in Gulf of Maine, and maintained by hatchery stocking. We present data on the ioptimization of egg planting as a strategy.
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Atkinson, E. and Zydlewski, J. (2024) Identifying Optimal Egg Planting Scenarios for Atlantic Salmon (Salmo salar) in Eastern Maine, USA. The Atlantic Salmon Ecosystems Forum, University of Maine, Orono, Maine. January 9.
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January 2024
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We developed a model to estimate recruitment to the 0+ parr based on patterns of egg planting, post-emergent fry dispersal patterns, and habitat specific survival. We developed a tool that allows managers to compare a range of stocking numbers and locations in a river network to optimize recruitment and minimize effort.
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Atkinson, E. and Zydlewski, J. (2022) Using dispersal data to optimize egg planting strategies for Atlantic Salmon. 2022 Atlantic Salmon Ecosystems Forum. January 11. University of Maine, Orono, Maine.
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January 2022
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Egg planting maximizes wild rearing opportunities which may be important for adaptation.We sought to develop an optimization tool that would allow managers to best select the number of eyed egg batches and their planting locations within a drainage targeted for supplementation.
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Antonelli, K., Murphy, C.A., Pollock, A., Gerth, W., and Arismendi, I. 2022. Hunting tiny vampires: modeling the distribution of a salmonid ectoparasite in Willamette Valley Reservoirs. 2022 Oregon Chapter of the American Fisheries Society Annual Meeting (virtual).
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March 2022
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The freshwater copepod <i>Salmincola californiensis</i> is an ectoparasite affecting salmonids in the genus <i>Oncorhynchus</i>. Information gained from our modeling effort on the infectious copepodid lifestage will be useful for guiding management decisions made by biologists and reservoir operators regarding salmon populations in reservoirs.
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Antonelli, K., Murphy, C.A., Pollock, A., Gerth, W., Arismendi, I. 2022. The (tiny) vampire diaries: exploring distribution, abundance, and in vitro development of the ectoparasite Salmincola californiensis in Willamette Valley Reservoirs. Presentation at the 61st Western Fish Disease Workshop. Hood River, Oregon.
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May 2022
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The freshwater copepod <i>Salmincola californiensis</i> is an ectoparasite affecting salmonids in the genus <i>Oncorhynchus</i>. Information gained from our efforts will be useful for guiding management decisions made by biologists and reservoir operators regarding salmon populations in reservoirs.
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Ames, C., Zydlewski, G.,Kinnison, M., Zydlewski, J., and Stewart, N. 2020. Atlantic and Shortnose Sturgeon population age structure and growth in the Gulf of Maine. North American Sturgeon and Paddlefish Society. Remote presentation. October 26.
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October 2020
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Movements of shortnose sturgeon from the Kennebec River to the Penobscot River may occur seasonally, with clear patterns of habitat use by some individuals. Both species are likely exploiting feeding opportunities in the Penobscot, as spawning has not been observed in this system.
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Ames, C., Zydlewski, G., Kinnison,M., and Zydlewski, J. (2020) Age structure of non-reproductive, partial migratory populations of sturgeon species in the Penobscot River, Maine. 2019 Atlantic Salmon Ecosystems Forum. January 14. University of Maine, Orono, Maine.
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January 2020
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Age structure of recovering populations of anadromous Atlantic (<i>Acipenser oxyrinchus</i>) and Shortnose sturgeon (<i>A. brevirostrum</i>) are not well understood in the Gulf of Maine. Our goal was to address this question by developing an age-at-length model for these species.
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Ames, C., Zydlewski, G., Kinnison, M., and Zydlewski, J. (2020) Age structure of recovering populations of sturgeon species in the Penobscot River, Maine. 150th Annual Meeting of the American Fisheries Society. Columbus, Ohio. August 30
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August 2020
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Age structure of Atlantic (<i>Acipenser oxyrinchus</i>) and Shortnose sturgeon (<i>A. brevirostrum</i>) are not well understood in the Penobscot River. Based on Von Bertalannfy growth models, growth rate per year was 0.07 and 0.06 for Atlantic and Shortnose sturgeon, and followed positive and negative latitudinal clines for growth and age, respectively.
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Ames, C., Zydlewski, G., Kinnison, M., and Zydlewski, J. (2018) Population-level responses of sturgeon to dam removals in Maine. 74th Annual Northeast Fish & Wildlife Conference. April 15. Burlington, Vermont.
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April 2018
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Atlantic Sturgeon (Acipenser oxyrhynchus) and Shortnose Sturgeon (A. brevirostrum) are anadromous species federally listed under ESA,in the Gulf of Maine (GOM). We have combined mark-recapture methods with acoustic telemetry data approaches to generate biologically realistic population estimates.
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Ames, C., Zydlewski, G., Kinnison, M., and Zydlewski, J. (2018) Population characteristics of sub-adult Atlantic Sturgeon (Acipenser oxyrhynchus) in the Penobscot River, Maine. 2018 Atlantic Salmon Ecosystems Forum. January 17. University of Maine, Orono, Maine.
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January 2018
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Atlantic Sturgeon (Acipenser oxyrinchus) is an anadromous species listed as federally threatened in the Gulf of Maine (GOM). Our goal was to determine population size and demographic characteristics such as growth and condition in the Penobscot River, Maine
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Ames, C., Zydlewski, G., Kinnison, M., and Zydlewski, J. (2017) Road to Success: Determining the status and responses of Gulf of Maine sturgeon to management. Annual meeting of the Maine Cooperative Fish and Wildlife Research Unit, University of Maine, Orono. March 22.
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March 2017
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In 2012 a major cooperative effort resulted in the removal of the two lowermost dams on the Penobscot River, Maine restoring the presumed historic ranges of shortnose sturgeon. Associated changes in demographic measures were also explored.
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Ames, C., Zydlewski, G., Kinnison, M., and Zydlewski, J. (2017) Population-level responses of sturgeon to dam removals in Maine. 147th Annual Meeting of the American Fisheries Society. Tampa, FL. August 20.
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August 2017
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In 2012 a major cooperative effort resulted in the removal of the two lowermost dams on the Penobscot River, Maine restoring the presumed historic ranges of shortnose sturgeon. Associated changes in demographic measures were also explored.
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Ames, C., Neary, M., Pettigrew, N., Kinnison, M., Zydlewski, J., and Zydlewski, G. (2018) Population characteristics of sub-adult Atlantic Sturgeon in the Penobscot River, Maine. Maine Cooperative Fish and Wildlife Research Unit Cooperator’s Meeting, March 22. University of Maine, Orono.
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March 2018
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Atlantic sturgeon have been recently listed as threatened in the Gulf of Maine. We are using telemetry and recapture methods to inform population level patterns.
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Ames, C., Neary, M., Pettigrew, N., Kinnison, M., Zydlewski, J., Zydlewski, G. (2018) Use of a slocum glider for active tracking and winter habitat description of Atlantic Sturgeon (Acipenser oxyrinchus oxyrinchus) in mid-coast Maine. 148th Annual Meeting of the American Fisheries Society. Atlantic City, New Jersey. August 20.
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August 2018
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Atlantic Sturgeon (Acipenser oxyrinchus oxyrinchus) are listed as federally threatened in the Gulf of Maine (GOM). Based on acoustic telemetry in the GOM, sub-adults spend about six months at sea during winter before returning to rivers in late spring.
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Ames, C., Kinnison, M., Zydlewski, J., and Zydlewski, G. (2019) Recovery of shortnose and Atlantic sturgeon in the Penobscot River, Maine. 2019 Maine Sustainability and Water Conference, Augusta, Maine. March 28.
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March 2019
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Atlantic sturgeon (Acipenser oxyrhynchus) and shortnose sturgeon (A. brevirostrum) are anadromous species listed as threatened and endangered, respectively, in the Penobscot River. To generate biologically realistic estimates of abundance in the Penobscot River, we have combined mark-recapture methods with acoustic telemetry analysis.
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Ames, C., Kinnison, M., Zydlewski, J., and Zydlewski, G. (2019) Recovery of shortnose and Atlantic sturgeon in the Penobscot River, Maine. 2019 Coordinating Committee Meeting of the U.S. Geological Survey, Maine Cooperative Fish and Wildlife Research Unit. Orono, ME. March 26. (Poster)
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March 2019
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Sturgeon species are endangered in the Gulf of Maine. We present data on the the Penobscot River populations
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Ames, C., Kinnison, M., Zydlewski, J., and Zydlewski, G. (2019) Foraging ecology and prey availability of Atlantic and shortnose sturgeon populations in Maine. 149th Annual Meeting of the American Fisheries Society. Reno Nevada. September 29.
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September 2019
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Atlantic (Acipenser oxyrhynchus) and Shortnose (A. brevirostrum) sturgeon are anadromous species that are listed as threatened and endangered, respectively, in the Gulf of Maine (GOM).Within the GOM, both species make migrations between the Penobscot and Kennebec Rivers, though spawning occurs in the Kennebec. Movements to the Penobscot may provide increased foraging opportunities or release from density dependent competition.
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Altenritter,M., Kinnison, M., Zydlewski, G., Zydlewski, J., and Secor, D. (2015) Dorsal scutes: an otolith alternative to infer the origins and life histories of shortnose sturgeon (Acipenser brevirostrum). 145th Annual Meeting of the American Fisheries Society. Portland Oregon. August 16-20 INVITED.
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August 2015
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The imperiled status of sturgeon worldwide places great importance on elucidating individual life histories. We propose dorsal scutes from sturgeon as a non-lethal alternative to otoliths and fin rays for inferring life histories and movements of sturgeons.
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Altenritter, M., Zydlewski, G., Kinnison, M., Zydlewski, J., Secor, D., and Sigourney, D. (2015) Shortnose sturgeon population dynamics in the Gulf of Maine. Annual meeting of the Maine Cooperative Fish and Wildlife Research Unit, University of Maine, Orono. March 25.
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March 2015
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Shortnose sturgeon move between systems in the Gulf of Maine. These movements have implications for the management of this endangered species.
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Altenritter, M., Kinnison, M., Zydlewski, G., Zydlewski, J., and Yates, M. (2014) Microchemical analysis of dorsal scutes to infer the origins and life histories of shortnose sturgeon. 144th Annual Meeting of the American Fisheries Society. Québec City, Canada. August 17-21.
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August 2014
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Determining individual origins, movements and life histories within complex population networks is important for understanding how such networks function as a whole. We investigated the use of dorsal scutes from shortnose sturgeon as a hard structure that could be used for chronological analysis.
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Altenritter, M., Kinnison, M., Zydlewski, G., Zydlewski, J., and Yates, M. (2014) Assessing microchemical analysis of dorsal scutes to infer the origins and life histories shortnose sturgeon. 2014 Atlantic Salmon and Their Ecosystems Forum, University of Maine, Orono. January 8.
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January 2014
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This work presents data on the use of sturgeon bony plates (scutes) for the chronological assessment of environmental use via microchemical analysis. Strontium:Calcium ratios are used to infer time spent in freshwater and seawater.
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Altenritter, M., Dzaugis,M., Zydlewski,G., Kinnison,M., Zydlewski, J., and Wippelhauser, G.(2013) Shortnose sturgeon of the Penobscot: local residency and regional connections Poster presentation to DSSRN, January 10.
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January 2013
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This work presents movement data for endangered shortnose sturgeon between river systems.
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Altenritter, M., Zydlewski, G., Kinnison, M., and Zydlewski, J. (2012) Coastal river connectivity and shortnose sturgeon: a metapopulation perspective. 2012 Forum, Atlantic Salmon and their Ecosystems, Bangor Maine January 10-11.
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January 2012
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Altenritter, M., Zydlewski, G., Kinnison, M., Dzaugis, M., Zydlewski, J., Altenritter M. (2014) Atlantic sturgeon movements and habitat use in the Penobscot River, with implications of dam removal. 144th Annual Meeting of the American Fisheries Society. Québec City, Canada. August 17-21.
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August 2014
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Historically, coastal rivers along the Atlantic coast supported large populations of Atlantic sturgeon (Acipenser oxyrinchus), but overharvest, habitat loss, and habitat degradation have decimated populations. Since 2006, 181 Atlantic sturgeon have been captured, 43 of which were tagged with acoustic transmitters, and monitored in the Penobscot River, Maine.
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Altenritter, M. E. L., Zydlewski, G. B., Kinnison M. T., Zydlewski, J. D., Wippelhauser, G. S., and Sulikowski, J.A. (2011) Coastal river connectivity and shortnose sturgeon: a metapopulation perspective. 141th Annual Meeting of the American Fisheries Society. Seattle, Washington. September 4-9.
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September 2011
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Altenritter, M. Zydlewski, G., Altenritter, M., Kinnison, M., and Zydlewski, J. (2014) Demographics and movement patterns of Atlantic sturgeon (Acipenser oxyrinchus oxyrinchus) in the Penobscot River, Maine. 2014 Atlantic Salmon and Their Ecosystems Forum, University of Maine, Orono. January 8.
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January 2014
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Atlantic sturgeon in the Gulf of Maine have been recently listed under ESA. Characterization of sub-adult habitat use in the Penobscot River is presented.
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Zydlewski, J. (2023) Are there too many alewife? Augusta DEP Water Conference, Invited Plenary, Brunswick Maine, April 19
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April 2023
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Are there too many alewife?
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Zydlewski, J., Stich, D., Roy, S., Sheehan, T., Sprankle, K., Bailey, M. (2022) What have we lost? American shad’s impounded history. 2022 Atlantic Salmon Ecosystems Forum. January 11. University of Maine, Orono, Maine.
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January 2022
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American shad (<i>Alosa sapidissima</i>) are native to the east coast of North America from the St. Johns River, Florida, to the St. Lawrence River region in Canada. To assess the impact of dams, we estimated the historically accessed spawning habitat in coastal rivers (485,618 river segments with 21,113 current dams) based on (i) width, (ii) distance from seawater, and (iii) slope (to exclude natural barriers to migration) combined with local knowledge.
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Zydlewski, J., Coghlan.Jr., S., Dillingham, C., Figueroa-Muñoz, G., Merriam, C., Smith, S., Smith, R., Stich, D., Vogel, S., Wilson, K., and Zydlewski, G. (2024) Seven dam challenges for migratory fish: insights from the Penobscot River. The Atlantic Salmon Ecosystems Forum, University of Maine, Orono, Maine. January 9.
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January 2023
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Herein we discuss the seven interconnected and complex ways that dams have affected the Penobscot River ecosystem. These include familiar influences ascribed to dams and other ecological influences.
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Zydlewski, J., Carr, T., Flye, M., Frechette, D., Kircheis, D., Loring, Jr., C., McCaw, D., Merriam, C., Sponarski, C. Restoring migratory fish and their cultural connection in the Penobscot River. 154th Annual Meeting of American Fisheries Society, Honolulu, Hawai’i. September 15.
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September 2024
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Abundant sea run-fish once connected indigenous people to the Penobscot River through nutritional and cultural sustenance. We explore the current regulatory structure for Atlantic salmon to understand the roles of the Penobscot Nation.
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Zydlewski, J. (2023) Aquaculture and fish conservation. Down East Salmon Federation, Machias Maine, April 6.
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April 2023
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Aquaculture and fish conservation
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Zydlewski, J. (2023) Aquaculture and fish conservation. Council of the Atlantic Salmon Federation, Brewer, Maine, April 22.
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April 2023
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Aquaculture and fish conservation
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Zydlewski, J. (2020) The lovable lamprey. Penobscot County Conservation Association. Brewer, ME. January 9.
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January 2020
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Lamprey have a bad reputation, but are indigenous to the north east. Their ecology and restoration were discussed.
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Zydlewski, J. (2020) Diadromous fish research in the Penobscot River. Atlantic International Chapter of the American Fisheries Society, Virtual Meeting. August 25.
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August 2020
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For more than 15 years coop unit studentrs have been studying the Penobscot River. A time line of discovery was presented.
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298. Greig, H. S., Ramberg-Pihl, N., Coghlan, Jr., S. and Zydlewski, J. (2016). Improving assessment of critical habitat for Atlantic salmon in a rapidly-changing climate. Maine Sea Grant Research Symposium. University of Maine, Orono. April 15.
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April 2016
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Presentation of work intended to characterize the role of inter and intra-specific competition in habitat choice for Atlantic salmon. Approaches and expectations are discussed.
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2022 Vogel, S.K., Loftin, C., Zydlewski, J.D. Collaborative networks within the CRU program. [oral, invited] Atlantic International Chapter of the American Fisheries Society Annual Conference. September 18, 2022. Newry, ME.
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September 2022
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The U.S. Geological Survey’s (USGS) Cooperative Fish and Wildlife Research Units (CRU) program establishes relationships among the USGS, U.S. Fish and Wildlife Service, Wildlife Management Institute, host universities, and state resource agencies. This research focuses on analyzing Unit scientist impacts and outputs by assessing the collaborative networks of the Units and the production of scientific publications as one measure of impact.
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2022 Vogel, S.K., Loftin, C., Zydlewski, J.D. Collaborative networks within the CRU program. [oral, invited] Atlantic International Chapter of the American Fisheries Society Annual Conference. September 18, 2022. Newry, ME.
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September 2022
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text
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Izzo, L., Maynard, G. and Zydlewski, J. (2016) Behavior and Upstream Passage of Atlantic Salmon at the New Milford Fish Lift on the Penobscot River, ME. 2016 Atlantic Salmon Ecosystems Forum. January 6-7. University of Maine, Orono, Maine.
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January 2016
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The PRRP is expected to increase upstream habitat access for Atlantic Salmon, however this increase is dependent upon successful passage at a newly constructed fish lift at Milford Dam, as nearly all suitable spawning habitat is located upstream of Milford. In 2014 and 2015, a total of seventy three adult salmon were captured at Milford, radio and PIT tagged, and displaced downstream in tidal reaches below the removed dams to track their upstream migration through the lower Penobscot River.
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Fuller, A. K., D. J. Harrison, and W. B. Krohn. Landscape planning for northern Maine
forestlands using area sensitive umbrella species. Maine Cooperative Forestry Research Unit, University of Maine, Orono.
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April 2010
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