Cooperative Fish and Wildlife Research Units Program: Maine
Education, Research and Technical Assistance for Managing Our Natural Resources

Maine Staff Member

Daniel M Weaver

Daniel Weaver 2018

Phone: (207) 581 - 2939
Personal website


  • Ph D University of Maine 2017
  • MS North Carolina State University 2010
  • BS Virginia Tech 2007


I joined the Maine Coop Unit and Wildlife, Fisheries, Conservation Biology department in the summer of 2013. I'm originally from Virginia and in my free time I enjoy running, hiking, and kayaking.

Research Interest

Broadly I am interested in population and community dynamics and food web interactions in rivers and streams and those that bridge freshwater and marine ecosystems with an emphasis on fish, but also aquatic invertebrates and microorganisms. My PhD work demonstrated linkages between freshwater and marine ecosystems through the nutrient dynamics of anadromous sea lamprey. Currently I'm exploring other diadromous fishes including American eel and American shad and their migratory movement through fishways and dams. I’m working on developing a Bayesian forecasting model to predict the movement and behavior of outmigrating silver-phase American eel through dams. I work to develop a framework that will assist natural resource managers in the decision-making process of managing and conserving fisheries and ecosystem functions.

Research Publications Publication Date
Weaver, D.M., T.J. Kwak, and K.H. Pollock. 2014. Sampling characteristics and calibration of snorkel counts to estimate stream fish populations. North American Journal of Fisheries Management 34:1159-1166. 2014-12-31
Weaver, D.M. and T.J. Kwak. 2013. Assessing effects of stocked trout on nongame fish assemblages in southern Appalachian Mountain streams. Transactions of the American Fisheries Society 142: 1495-1507. 2013-09-30
Weaver, D., Coghlan, S., and Zydlewski, J. (2016) Sea Lamprey Carcasses Exert Local and Variable Food Web Effects in a Nutrient-limited Atlantic Coastal Stream. Canadian Journal of Fisheries and Aquatic Sciences.(online) DOI: 10.1139/cjfas-2015-0506 | Download 2016-07-31
Weaver, D., Coghlan, S., and Zydlewski, J. (2015) Decomposition of Sea Lamprey Carcasses: Temperature Effects, Nutrient Dynamics, and Implications for Stream Food Webs. Hydrobiologia. On line - DOI 10.1007/s10750-015-2302-5. | Download 2015-04-30
Weaver, D., Coghlan Jr., S., Greig, H., Klemmer, A., Perkins, L., and Zydlewski, J. (2018) Subsidies from anadromous sea lamprey (Petromyzon marinus) carcasses function as a reciprocal nutrient exchange between marine and freshwaters. River Research and Applications. DOI: 10.1002/rra.3291 | Download 2018-05-31
Weaver, D., Coghlan Jr., S. and Zydlewski, J. (2018) The influence of nutrients from carcasses of sea lamprey (Petromyzon marinus) on larval growth and spawner abundance. Fisheries Bulletin. 116:142–152, DOI: 10.7755/FB.116.2.3 | Download 2018-01-31
Weaver, D., Coghlan Jr., S. and Zydlewski, J. (2018) Effects of sea lamprey substrate modification and carcass nutrients on macroinvertebrate assemblages in a small Atlantic coastal stream. Journal of Freshwater Ecology, 33:1, 19-30, DOI: 10.1080/02705060.2017.1417168 | Download 2018-01-31
Hogg, R., Coghlan., Jr., Zydlewski, J. and Simon, K. (2014) Anadromous sea lamprey Petromyzon marinus serve as ecosystem engineers in a coastal spawning tributary. Freshwater Biology. Freshwater Biology, 59(6), 1294-1307. | Download 2014-04-30
Hogg, R., Coghlan Jr., S. and Zydlewski, J. (2013) Anadromous sea lamprey (Petromyzon marinus) recolonize a coastal river tributary after dam removal. Transactions of the American Fisheries Society. 142(5):1381-1394. | Download 2013-09-30
Hogg, R., Coghlan Jr., S. Zydlewski, J., and Gardner, C. (2015) Fish Community Response to a Small-Stream Dam Removal in a Maine Coastal River Tributary. Transactions of the American Fisheries Society 144(3), 467-479. | Download 2015-05-31
Gardner, C. Coghlan, S., Zydlewski, J., and Saunders, R. (2011) Distribution and abundance of stream fishes in relation to barriers: Implications for monitoring stream recovery after barrier removal. River Research and Applications. DOI: 10.1002/rra.1572 | Download 2011-06-30
Gardner, C. Coghlan, S., Zydlewski, J. (2012) Distribution and Abundance of Anadromous Sea Lamprey Spawners in a Fragmented Stream: Current Status and Potential Range Expansion Following Barrier Removal. Northeastern Naturalist 19(X):00-00. | Download 2012-01-31
81. Weaver, D., Ratten, S., Coghlan, Jr., S., and Sherwood, G., and Zydlewski, J. (2018) Age and growth of a native, lightly exploited, population of lake whitefish Coregonus clupeaformis in a small natural lake in Maine, USA. Northeastern Naturalist 25(4):599-610. DOI: 10.1656/045.025.0406 | Download 2018-11-30
Presentations Presentation Date
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. 2018-08-20
Technical Publications Publication Date
Wallace, B.C., D.M. Weaver, and T.J. Kwak. 2011. Efficiency of baited hoop nets for sampling catfish in southeastern U.S. small impoundments. Pages 581-588 in P.H. Michaletz and V.H. Travnichek, editors. Conservation, ecology, and management of catfish: the second international symposium. American Fisheries Society Symposium 77, Bethesda, Maryland. 2011-08-31