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

Oregon Project


The demography of Northern Spotted Owls in Oregon and Washington

April 2010 - September 2023


Personnel

Participating Agencies

  • US Fish and Wildlife Service
  • U.S. Fish and Wildlife Service
  • USDA Forest Service
  • Pacific Northwest Research Station
  • Rogue-Siskiyou National Forest

The Northern Spotted Owl (Strix occidentalis caurina) is listed as Threatened under the Endangered Species Act, primarily because of the loss of old growth forest habitat due to timber harvest. The Northwest Forest Plan was developed in the mid-1990's to conserve the owl and other old growth species, while allowing greatly reduced levels of commercial timber harvest on federal land. The Plan required the implementation of a regional effectiveness monitoring program for the spotted owl. This research project collects and analyzes data from 5 of the 7 spotted owl effectiveness monitoring program study areas across the owl's range. Data from this work is used to regularly evaluate population trends of spotted owls, as well as increase our understanding of owl ecology, including dispersal, diet, nest site selection, behavior, genetics, and response to a recent, congeneric invader, the Barred Owl (Strix varia).

Research Publications Publication Date
Davis, RJ, and KM Dugger. 2011. Northwest forest plan–the first 15 years (1994–2008): status and trends of Northern Spotted Owl populations and habitat. USDA Forest Service General Technical Report PNW-GTR-850. 2011-10-31
Dugger, KM, FF Wagner, RG Anthony, GS Olson. 2005. The relationship between habitat characteristics and demographic performance of Northern Spotted Owls in southern Oregon. Condor 107:865-880. 2005-10-31
Dugger, KM, RG Anthony, and LS Andrews. 2011. Transient dynamics of invasive competition: barred owls, spotted owls and the demons of competition present. Ecological Applications 21:2459-2468. 2011-10-31
Anthony, RG, ED Forsman, AB Franklin, DR Anderson, KP Burnham, GC White, CJ Schwarz, JD Nichols, JE Hines, GS Olson, SH Ackers, S Andrews, BL Biswell, PC Carlson, LV Diller, KM Dugger, KE Fehring, TL Fleming, RP Gerhardt, SA Gremel, RJ Gutiérrez, PJ Happe, DR Herter, JM Higley, RB Horn, LL Irwin, PJ Loschl, JA Reid, SS Sovern. 2006. Status and trends in demography of Northern Spotted Owls, 1985-2003. Wildlife Monographs 163:1-47. 2006-10-31
Forsman, ED, RG Anthony, KM Dugger, EM Glenn, AB Franklin, GC White, CJ Schwarz, KP Burnham, DR Anderson, JD Nichols, JE Hines, JB Lint, RJ Davis, SH Ackers, LS Andrews, BL Biswell, PC Carlson, LV Diller, SA Gremel, DR Herter, JM Higley, RB Horn, JA Reid, J Rockweit, J Schaberel, TJ Snetsinger, and SG Sovern. 2011. Population demography of northern spotted owls. Studies in Avian Biology 40. 2011-09-30
Olson, GS, RG Anthony, ED Forsman, SH Ackers, PJ Loschl, JA Reid, KM Dugger, EM Glenn, and WJ Ripple. 2005. Modeling of site occupancy dynamics of northern spotted owls in Oregon, including the effects of barred owl encroachment. Journal of Wildlife Management 69:918-932. 2005-10-31
Schilling, J.W., K.M. Dugger and R.G. Anthony. 2013. Survival and home-range size of northern spotted owls in southwestern Oregon. Journal of Raptor Research 47:1-14. 2013-03-31
Ackers, S.H., R.J. Davis, K.A. Olsen, and K.M. Dugger. 2014. The evolution of mapping habitat for northern spotted owls (Strix occidentalis caurina): a comparison of photo-interpreted, Landsat, and LiDAR based habitat maps. Remote Sensing of Environment 156:361-373. 2014-10-31
Sovern, S.G., E.D. Forsman, K.M. Dugger, and M.Taylor. 2015. Habitat use by northern spotted owls during natal dispersal. Journal of Wildlife Management 79:254-262. 2015-01-31
Dugger, K. M., E. D. Forsman, A. B. Franklin, R. J. Davis, G. C. White, C. J. Schwarz, K. P. Burnham, J. D. Nichols, J. E. Hines, C. B. Yackulic, P. F. Doherty, Jr., L. Bailey, D. A. Clark, S. H. Ackers, L. S. Andrews, B. Augustine, B. L. Biswell, J. Blakesley, P. C. Carlson, Matthew J. Clement, L. V. Diller, E. M. Glenn, A. Green, S. A. Gremel, D. R. Herter, J. M. Higley, J. Hobson, R. B. Horn, K. P. Huyvaert, C. McCafferty, T. McDonald, K. McDonnell, G. S. Olson, J. A. Reid, J. Rockweit, V. Ruiz, J. Saenz, S. G. Sovern. 2016. The effects of habitat, climate and Barred Owls on long-term demography of Northern Spotted Owls. The Condor: Ornithological Applications Volume 118:57–116, DOI: 10.1650/CONDOR-15-24.1 2016-02-28
Diller, L, K Hamm, D Early, D Lamphear, K Dugger, C Yackulic, C Schwarz, P. Carlson, and T McDonald. 2016. Demographic response of Northern Spotted Owls to Barred Owl removal in Coastal Northern California. Journal of Wildlife Management 80:691-707, DOI: 10.1002/jwmg.1046. 2016-04-30
Miller, M.P., Haig, S.M., Forsman, E.D., Anthony, R.G., Diller, L., Dugger, K.M., Franklin, A.B., Gremel, S.A., Lesmeister, D.B., Higley, M., Herter, D.R., Sovern, S.G., 2018, Variation in inbreeding rates across the range of Northern Spotted Owls (Strix occidentalis caurina)- insights from over 30 years of monitoring data: The Auk: Ornithological Advances, v. 135, no. 4, p. 821-833, https://doi.org/10.1642/AUK-18-1.1. 2018-07-31
Sovern, S.G., D.B. Lesmeister, K.M. Dugger, M.S. Pruett, R.J. Davis, and J.M. Jenkins. 2019. Activity Center Selection by Northern Spotted Owls. Journal of Wildlife Management 000:000-000, DOI: 10.1002/jwmg.21632 2019-01-31
Yackulic, CB, LL Bailey, KM Dugger, RJ Davis, AB Franklin, ED Forsman, SH Ackers, LS Andrews, LV Diller, SA Gremel, KA, Hamm, DR Herter, JM Higley, RB Horn, C McCafferty, JA Reid, JT Rockweit, and, SG Sovern. 2019. The past and future roles of competition and habitat in the range-wide occupancy dynamics of northern spotted owls: Ecological Applications, 29(3), doi.org/10.1002/eap.1861. 2019-04-30
Jenkins, JMA, DB. Lesmeister, ED Forsman, KM Dugger, SH Ackers, LS Andrews, CE McCafferty, MS Pruett, JA Reid, SG Sovern, RB Horn, SA Gremel, JD Wiens, and Z Yang. 2019. Social status, forest disturbance, and barred owls shape long-term trends in breeding dispersal distance of Northern Spotted Owls. The Condor 121:1–17, DOI: 10.1093/condor/duz055 2019-12-31
Duchac, L.S., D.B. Lesmeister, K.M. Dugger, Z.J. Ruff, and R.J. Davis. 2020. Passive acoustic monitoring effectively detects Northern Spotted Owls and Barred Owls over a range of forest conditions. The Condor 122: 1–22, DOI: 10.1093/condor/duaa017. 2020-04-30
Technical Publications Publication Date
Anthony, RG, ED Forsman, AB Franklin, DR Anderson, KP Burnham, GC White, CJ Schwarz, JD Nichols, JE Hines, GS Olson, SH Ackers, S Andrews, BL Biswell, PC Carlson, LV Diller, KM Dugger, KE Fehring, TL Fleming, RP Gerhardt, SA Gremel, RJ Gutiérrez, PJ Happe, DR Herter, JM Higley, RB Horn, LL Irwin, PJ Loschl, JA Reid, SS Sovern. 2004. Status and trends in demography of Northern Spotted Owls, 1985-2003. Final Report to Interagency Regional Monitoring Program, Portland, OR (peer-reviewed by 4 ESA members). Oregon Cooperative Fish and Wildlife Research Unit, Corvallis, OR. 2004-04-30
Anthony, RG, FF Wagner, K Dugger, and G Olson. 2002. Identification and evaluation of northern spotted owl habitat in managed forests of southwestern Oregon and the development of silvicultural systems for managing such habitat: Report on Step 2: Analysis of habitat characteristics and owl demography on three density study areas. Oregon Cooperative Fish and Wildlife Research Unit, Corvallis, OR. 2002-09-30
Dugger, KM, F Wagner, and RG Anthony. 2005. Identification and evaluation of northern spotted owl habitat in managed forests of southwestern Oregon and the development of silvicultural systems for managing such habitat. Report on Step 3: Predicting northern spotted owl survival and reproductive success from habitat characteristics of managed forests of southwestern Oregon. Oregon Cooperative Fish and Wildlife Research Unit, Corvallis, OR. 2005-01-31
Dugger, KM, RG Anthony, and E Forsman. 2009. Estimating Northern Spotted Owl Detection Probabilities: Updating the USFWS Northern Spotted Owl Survey Protocol. Department of Fisheries and Wildlife, Oregon Cooperative Fish and Wildlife Research Unit, Corvallis, OR 2009-10-31
Dugger, KM, RG Anthony, and LS Lawrence. 2008. Site occupancy dynamics of Northern Spotted Owls relative to Barred Owl occurrence and forest habitat characteristics in the southern Cascades of Oregon. 40pp. Unpublished report on file with: Oregon Cooperative Fish and Wildlife Research Unit, Department of Fisheries and Wildlife, Oregon State University, Corvallis, OR 97331. 2008-07-31
Dugger, KM, RG Anthony, S Andrews, and F Wagner. 2006. Modeling apparent survival and reproductive success of Northern Spotted Owls relative to forest habitat in the southern Cascades of Oregon. Oregon Cooperative Fish and Wildlife Research Unit, Corvallis, OR. 2006-05-31
Dugger KM, JW Schilling, RG Anthony, and LS Andrews. 2011. Apparent occupancy and the reproductive rates of Northern Spotted Owls in the Ashland Watershed, Siskiyou Mountains, southern Oregon 1993-1997, 2005-2011. Department of Fisheries and Wildlife, Oregon Cooperative Fish and Wildlife Research Unit, Corvallis, OR 2011-12-31
Dugger, KM, S Ackers et al. 2011. The Demography of Northern Spotted Owls (Strix occidentalis caurina) on the Willamette National Forest, Oregon. Oregon Cooperative Fish and Wildlife Research Unit (OCFWRU), Department of Fisheries and Wildlife, Oregon State University, Corvallis, Oregon. 51p. 2011-01-31
Dugger, KM, S Andrews et al. 2011. Demographic Characteristics and Ecology of Spotted Owls (Strix occidentalis caurina) in the Southern Oregon Cascades. Oregon Cooperative Fish and Wildlife Research Unit (OCFWRU), Department of Fisheries and Wildlife, Oregon State University, Corvallis, Oregon. 30p. 2011-01-31
Dugger, KM, S Ackers, et al. 2012. The Demography of Northern Spotted Owls (Strix occidentalis caurina) on the Willamette National Forest, Oregon. Oregon Cooperative Fish and Wildlife Research Unit (OCFWRU), Department of Fisheries and Wildlife, Oregon State University, Corvallis, Oregon. Annual Progress Report, 55pp. 2012-12-31
Dugger, KM, S Andrews, et al. 2012. Demographic Characteristics and Ecology of Spotted Owls (Strix occidentalis caurina) in the Southern Oregon Cascades. Oregon Cooperative Fish and Wildlife Research Unit (OCFWRU), Department of Fisheries and Wildlife, Oregon State University, Corvallis, Oregon. Annual Progress Report. 25p. 2012-12-31
Dugger, KM, S Ackers, et al. 2013. The Demography of Northern Spotted Owls (Strix occidentalis caurina) on the Willamette National Forest, Oregon. Oregon Cooperative Fish and Wildlife Research Unit (OCFWRU), Department of Fisheries and Wildlife, Oregon State University, Corvallis, Oregon. Annual Progress Report, 51pp. 2013-12-31
Dugger, KM, S Andrews, et al. 2013. Demographic Characteristics and Ecology of Spotted Owls (Strix occidentalis caurina) in the Southern Oregon Cascades. Oregon Cooperative Fish and Wildlife Research Unit (OCFWRU), Department of Fisheries and Wildlife, Oregon State University, Corvallis, Oregon. Annual Progress Report. 23p. 2013-12-31
Dugger, KM, S Ackers, et al. 2014. The Demography of Northern Spotted Owls (Strix occidentalis caurina) on the Willamette National Forest, Oregon. Oregon Cooperative Fish and Wildlife Research Unit (OCFWRU), Department of Fisheries and Wildlife, Oregon State University, Corvallis, Oregon. Annual Progress Report, 51pp. 2014-12-31
Dugger, KM, S Andrews, et al. 2014. Demographic Characteristics and Ecology of Spotted Owls (Strix occidentalis caurina) in the Southern Oregon Cascades. Oregon Cooperative Fish and Wildlife Research Unit (OCFWRU), Department of Fisheries and Wildlife, Oregon State University, Corvallis, Oregon. Annual Progress Report. 24p. 2014-12-31
Dugger, KM, S Ackers et al. 2015. The Demography of Northern Spotted Owls (Strix occidentalis caurina) on the Willamette National Forest, Oregon. Oregon Cooperative Fish and Wildlife Research Unit (OCFWRU), Department of Fisheries and Wildlife, Oregon State University, Corvallis, Oregon. Annual Progress Report, 52pp. 2015-12-31
Dugger, KM, S Andrews, et al. 2015. Demographic Characteristics and Ecology of Spotted Owls (Strix occidentalis caurina) in the Southern Oregon Cascades. Oregon Cooperative Fish and Wildlife Research Unit (OCFWRU), Department of Fisheries and Wildlife, Oregon State University, Corvallis, Oregon. Annual Progress Report. 33p. 2015-12-31
Dugger KM, T Tippin, and LS Andrews. 2015. Apparent occupancy and the reproductive rates of Northern Spotted Owls in the Ashland Watershed, Siskiyou Mountains, southern Oregon 1993-1997, 2005-2014. Annual Report. Oregon Cooperative Fish and Wildlife Research Unit (OCFWRU), Department of Fisheries and Wildlife, Oregon State University, Corvallis, Oregon. 17pp. 2015-07-31
Dugger, KM, S. Ackers, et al. 2016. The Demography of Northern Spotted Owls (Strix occidentalis caurina) on the Willamette National Forest, Oregon. Oregon Cooperative Fish and Wildlife Research Unit (OCFWRU), Department of Fisheries and Wildlife, Oregon State University, Corvallis, Oregon. Annual Progress Report, 52pp. 2016-12-31
Dugger, KM, S Andrews, et al. 2016. Demographic Characteristics and Ecology of Spotted Owls (Strix occidentalis caurina) in the Southern Oregon Cascades. Oregon Cooperative Fish and Wildlife Research Unit (OCFWRU), Department of Fisheries and Wildlife, Oregon State University, Corvallis, Oregon. Annual Progress Report. 33p. 2016-12-31
Dugger KM, and LS Andrews. 2016. Apparent occupancy and the reproductive rates of Northern Spotted Owls in the Ashland Watershed, Siskiyou Mountains, southern Oregon 1993-1997, 2005-2015. Annual Report. Oregon Cooperative Fish and Wildlife Research Unit (OCFWRU), Department of Fisheries and Wildlife, Oregon State University, Corvallis, Oregon. 17pp. 2016-05-31
Dugger, KM, S Ackers, et al. 2017. The Demography of Northern Spotted Owls (Strix occidentalis caurina) on the Willamette National Forest, Oregon. Oregon Cooperative Fish and Wildlife Research Unit (OCFWRU), Department of Fisheries and Wildlife, Oregon State University, Corvallis, Oregon. Annual Progress Report, 59pp. 2018-01-31
Dugger, KM, S Andrews, et al. 2017. Demographic Characteristics and Ecology of Spotted Owls (Strix occidentalis caurina) in the Southern Oregon Cascades. Oregon Cooperative Fish and Wildlife Research Unit (OCFWRU), Department of Fisheries and Wildlife, Oregon State University, Corvallis, Oregon. Annual Progress Report. 33p. 2018-01-31
Dugger KM, and LS Andrews. 2017. Apparent occupancy and the reproductive rates of Northern Spotted Owls in the Ashland Watershed, Siskiyou Mountains, southern Oregon 1993-1997, 2005-2016. Annual Report. Oregon Cooperative Fish and Wildlife Research Unit (OCFWRU), Department of Fisheries and Wildlife, Oregon State University, Corvallis, Oregon. 20pp. 2017-05-31
Dugger KM, LS Andrews, et al. 2018. Apparent occupancy and the reproductive rates of Northern Spotted Owls in the Ashland Watershed, Siskiyou Mountains, southern Oregon 1993-1997, 2005-2017. Annual Report. Oregon Cooperative Fish and Wildlife Research Unit (OCFWRU), Department of Fisheries and Wildlife, Oregon State University, Corvallis, Oregon. 19pp. 2018-07-31
Dugger, KM, S Ackers, et al. 2018. The Demography of Northern Spotted Owls (Strix occidentalis caurina) on the Willamette National Forest, Oregon. Oregon Cooperative Fish and Wildlife Research Unit (OCFWRU), Department of Fisheries and Wildlife, Oregon State University, Corvallis, Oregon. Annual Progress Report, 59pp. 2018-10-31
Dugger, KM, S Andrews, et al. 2018. Demographic Characteristics and Ecology of Spotted Owls (Strix occidentalis caurina) in the Southern Oregon Cascades. Oregon Cooperative Fish and Wildlife Research Unit (OCFWRU), Department of Fisheries and Wildlife, Oregon State University, Corvallis, Oregon. Annual Progress Report. 28p. 2019-03-31
Dugger, KM, S Ackers, et al. 2019. The Demography of Northern Spotted Owls (Strix occidentalis caurina) on the Willamette National Forest, Oregon. Oregon Cooperative Fish and Wildlife Research Unit (OCFWRU), Department of Fisheries and Wildlife, Oregon State University, Corvallis, Oregon. Annual Progress Report, 66pp. 2019-12-31
Dugger, KM, S Andrews, et al. 2019. Demographic Characteristics and Ecology of Spotted Owls (Strix occidentalis caurina) in the Southern Oregon Cascades. Oregon Cooperative Fish and Wildlife Research Unit (OCFWRU), Department of Fisheries and Wildlife, Oregon State University, Corvallis, Oregon. Annual Progress Report. 27p. 2020-02-28
Presentations Presentation Date
Dugger, KM, F Wagner, R Anthony, & G Olson. 2003. The identification and evaluation of northern spotted owl habitat in relation to their demographic performance in managed forests of southwestern Oregon. Oregon Chapter of The Wildlife Society Conference, Eugene, OR, February 2003. 2003-02-06
Dugger, KM, F Wagner, R Anthony, & G Olson. 2004. The identification and evaluation of northern spotted owl habitat in relation to their demographic performance in managed forests of southwestern Oregon. Public Meeting of the SEI Northern Spotted Owl Status Review, Vancouver, WA, March 5, 2004. 2004-05-05
Dugger, KM, F Wagner, R Anthony, & G Olson. 2006. The relationship between habitat characteristics and demographic performance of Northern Spotted Owls in southern Oregon. Northern Spotted Owl Science Workshop, Research Session, February 9, 2006, Portland, OR. 2006-02-09
Dugger, KM, RG Anthony, and LS Lawrence. 2009. Transient dynamics of invasive competition: barred owls, spotted owls and the demons of competition present. 16th Annual Conference of The Wildlife Society, Monterey, CA, September 20-24, 2009. 2009-09-24
Dugger, KM, RG Anthony, and LS Lawrence. 2009. Transient dynamics of invasive competition: barred owls, spotted owls and the demons of competition present. 79th Annual Meeting of the Cooper Ornithological Society, Tucson, AZ, April 16-19, 2009. 2009-04-19
Dugger, KM, RG Anthony, and LS Lawrence. 2011. Transient dynamics of invasive competition: barred owls, spotted owls and the demons of competition present. Barred Owl Working Group, Portland, Oregon, July 21, 2011. 2011-07-21
Schilling, J, KM Dugger, RG Anthony, D Clayton. 2009. Survival & Home Range of Northern Spotted Owls in the Siskiyou Mts. Oregon Chapter of The Wildlife Society Conference, Gleneden Beach, OR, February 10-13, 2009. 2009-02-13
Olson, GS, RG Anthony, ED Forsman, SH Ackers, PJ Loschl, JA Reid, KM Dugger, EM Glenn, and WJ Ripple. 2004. Modeling of site occupancy dynamics of northern spotted owls in Oregon, including the effects of barred owl encroachment. The Wildlife Society Annual Conference, Calgary, AB, Canada, September 20, 2004. 2004-09-20
Dugger, KM, RG Anthony, and LS Lawrence. 2009. Transient dynamics of invasive competition: barred owls, spotted owls and the demons of competition present. 79th Annual Meeting of the Cooper Ornithological Society, Tucson, AZ, April 16-19, 2009. 2009-04-19
Dugger, KM, RG Anthony, and LS Lawrence. 2009. Transient dynamics of invasive competition: barred owls, spotted owls and the demons of competition present. 16th Annual Conference of The Wildlife Society, Monterey, CA, September 20-24, 2009. 2009-09-24
Dugger, KM, RG Anthony, and LS Lawrence. 2011. Transient dynamics of invasive competition: barred owls, spotted owls and the demons of competition present. Barred Owl Working Group, Portland, Oregon, July 21, 2011. 2011-07-21
Anthony, R.G., K.M. Dugger, J.D. Wiens, and E.D. Forsman. 2012. Demographic Rates of Northern Spotted Owls: Implications for recovery planning for this threatened species. IVth International Wildlife Management Congress, Durban, South Africa, July 9-12, 2012. 2012-07-11
Davis, R.J., and K.M. Dugger. 2012. Habitat modeling, mapping and monitoring for northern spotted owls. ForestSAT 2012 conference, Corvallis, Oregon, September 11-14, 2012. 2012-09-13
Forsman, E.D., R.G. Anthony, K.M. Dugger, and E.M. Glenn. 2012. Population demography of the northern spotted owl. The Wildlife Society Annual Conference, Portland, Oregon, October 13-18, 2012 2012-10-17
Ackers, S.H., R.J. Davis, and K.M. Dugger. 2014. EVALUATION OF NORTHERN SPOTTED OWL (STRIX OCCIDENTALIS CAURINA) HABITAT MODELS USING LIDAR-BASED VEGETATION MEASUREMENTS AND LANDSAT-IMPUTED FOREST STAND CHARACTERISTICS. Oregon TWS Annual Meeting, February 5-7, 2014, Bend OR. 2014-02-05
Dugger, K.M. 2014. Importance of long term data to species conservation and management: measuring vital rates at the relevant scale. 2014 Morss Colloquium, "Conservation of polar species susceptible to impacts from climate change". Woods Hole Oceanographic Institute, Falmouth, MA. 2014-03-06
Dugger, K.M., E.D. Forsman, D.A. Clark, R.J. Davis and 33 others. 2014. Status and trends of the Northern Spotted Owl (strix occidentalis caurina): results of a range-wide meta-analysis. 2014 Joint Annual Meeting of American Ornithologist's Union, Cooper Ornithological Society, and Society of Canadian Ornithologists, September 22-28, 2014, Estes Park, CO. 2014-09-22
Dugger, KM, ED Forsman, AB Franklin, RJ Davis and 33 others. 2016. The effects of habitat, climate, and Barred Owls on long-term demography of Northern Spotted Owls. Society for Ecological Restoration Northwest regional conference, Portland, OR, April 5-7, 2016. 2016-04-05
Pruett, S., R.J. Davis, K.M. Dugger, J. Jenkins, D. Lesmeister, S. Sovern. 2017. Using LiDAR Data and a Bayesian Framework to Model Northern Spotted Owl Nest Site Selection . The Joint Meeting of the American Ornithological Society and the Society of Canadian Ornithologist/Société des Ornithologistes du Canada, East Lansing, MI, July 31-August 5, 2017. 2017-07-31
Pruett, S., R.J. Davis, K.M. Dugger, J. Jenkins, D. Lesmeister, S. Sovern. 2018. ASSESSING NORTHERN SPOTTED OWL NEST-SITE SELECTION WITH A LIDAR-BASED CANOPY COVER MODEL . oint annual meeting of the Oregon Chapter of The Wildlife Society, the Washington Chapter of The Wildlife Society, the Society for Northwestern Vertebrate Ecology, and the Northwestern Partners in Amphibians and Reptile Conservation. Portland, OR, Feb 13-16, 2018. 2018-02-13
Duchac, L., D.B. Lesmeister, and K.M. Dugger. 2018. Testing a passive acoustic approach to detect Northern Spotted Owls and Barred Owls . Joint annual meeting of the Oregon Chapter of The Wildlife Society, the Washington Chapter of The Wildlife Society, the Society for Northwestern Vertebrate Ecology, and the Northwestern Partners in Amphibians and Reptile Conservation. Portland, OR, Feb 13-16, 2018. 2018-02-13
Duchac, L., D.B. Lesmeister, and K.M. Dugger. 2018. Can passive acoustic monitoring detect and identify vocalization patterns in two congeneric forest owls in the Pacific Northwest? 89th Annual Meeting of the Northwest Science Association, Olympia WA, March 27-30, 2018 2018-03-27
Rockweit, J.T., D.B. Lesmeister, K.M. Dugger, A.B. Franklin, J.M. Higley, R.J. Davis, and Z. Yang. 2019. A meta-analysis of the impacts of wildfire on the apparent survival, recruitment, and movement rates of northern spotted owls. Oregon Chapter of the Wildlife Society 2019 Annual Meeting, Feb. 27 - March 1, Bend, OR. 2019-02-27
Mikkelsen, A.J., K.M. Dugger, D.B. Lesmeister, and K.M. O’Reilly. 2019. Spatio-temporal Dynamics and Effects of Stress on Juvenile Northern Spotted Owls. Oregon Chapter of the Wildlife Society 2019 Annual Meeting, Feb. 27 - March 1, Bend, OR. 2019-02-27
Duchac, L.S., D.B. Lesmeister, and K.M. Dugger. 2019. Who was that? Using passive acoustic monitoring to detect forest owls in the Pacific Northwest. Oregon Chapter of the Wildlife Society 2019 Annual Meeting, Feb. 27 - March 1, Bend, OR. 2019-02-27
Mangan, AO, T Chestnut, JC Vogler, IK Breckheimer, WM King, KE Bagnall and KM Dugger. 2019. Factors related to occupancy dynamics and breeding propensity of Northern Spotted Owls (Strix occidentalis caurina) in a protected area: habitat, weather and Barred Owl (S. varia) presence. 137th annual meeting of the American Ornithologists Society, June 24-28, 2019, Anchorage, AK. 2019-06-24
Jenkins, JMA, DB Lesmeister, ED Forsman, and KM Dugger. 2019. Long-term dynamics of dispersal distances by adult Northern Spotted Owls. 137th annual meeting of the American Ornithologists Society, June 24-28, 2019, Anchorage, AK. 2019-06-24
Jenkins, J.M.A., D.B. Lesmeister, E.D. Forsman, K.M. Dugger, & J.D. Wiens. 2019. Shifting trends in breeding dispersal for northern spotted owls. 26th Annual Meeting of The Wildlife Society, Sept. 29-Oct 3, 2019, Reno, NV. 2019-09-29
Duchac, L.S., D.B. Lesmeister, and K.M. Dugger. 2019. Landscape use by forest owls two years after mixed-severity wildfire: novel findings using passive acoustic monitoring. 26th Annual Meeting of The Wildlife Society, Sept. 29 - Oct. 3, 2019, Reno, NV. 2019-09-29
Mikkelsen, A.J., K.M. Dugger, D.B. Lesmeister, and K.M. O’Reilly. 2019. Spatio-temporal Dynamics and Effects of Stress on Juvenile Northern Spotted Owls. Oregon Chapter of the Wildlife Society 2019 Annual Meeting, Feb. 27 - March 1, Bend, OR. 2019-02-27
Theses and Dissertations Publication Date
Schilling, J.W. 2009. Demography, Home Range, and Habitat Selection of Northern Spotted Owls in the Ashland Watershed. M.S. Thesis, Oregon State University, Corvallis, OR. 129pp. 2009-06-30
Duchac, Leila S. 2019. Passive acoustic monitoring of owls: two studies in forested landscapes of the Pacific Northwest. M.S. Thesis, Oregon State University, Corvallis, Oregon. 171 pp. 2019-08-31
Mangan, Anna O. 2018. Effects of habitat characteristics, weather and presence of Barred Owls (Strix varia) on occupancy dynamics and breeding propensity of Northern Spotted Owls (S. occidentalis caurina) in Mount Rainier National Park. M.S. Thesis, Oregon State University, Corvallis, Oregon. 79 pp. 2018-06-30