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

California Staff Member

Dr. Walter G. Duffy

Walt Duffy
Unit Leader
Email: walter.duffy@humboldt.edu
Faculty Website

Links:

Education

  • Ph D Michigan State University 1985

Biography

Dr. Duffy has been leader of the California Unit since 1997. Walt retired February 2014. He is active in fisheries and watershed restoration ecology.. Ecosystem energetic processes, the ecology of Pacific salmon, watershed restoration and wetland ecology.. Dr. Duffy teaches courses in fish bioenergetics and restoration ecology of river fishes.

Research Publications Publication Date
Zimmer, K. D., M. A. Hanson, M. G. Butler and W. G. Duffy. 2001. Size distribution of aquatic invertebrates in two prairie wetlands, with and without fish, with implications for community production. Freshwater Biology 46:1-14. February 2001
Zimmer, K. D., M. A. Hanson, M. G. Butler and W. G. Duffy. 2001. Influence of fathead minnows on nutrient cycling, nutrient partitioning and ecosystem structure in prairie wetlands. Achives fur Hydrobiologia 150:411-433. June 2001
Williams, T. H., B. C. Spence, W.G. Duffy, D. Hillemeier, G. Kautsky, T. Lisle, M. McCain, T. Nickelson, G. Garman, E. Mora, and T. Pearson. 2008. Framework for assessing viability of threatened coho salmon in the Southern Oregon/Northern California Coast Evolutionarily Significant Unit. U.S. Department of Commerce, NOAA Technical Memorandum NOAA-TM-NMFS-SWFSC 432. | Publisher Website December 2008
Thorsteinson, L., VanderKooi, S., and Duffy, W., eds., 2011, Proceedings of the Klamath Basin Science Conference, Medford, Oregon, February 1–5, 2010: U.S. Geological Survey Open-File Report 2011-1196, 312 p. July 2011
Thorsteinson, L., Grimes, C., and Duffy, W., 2011, An overview of the Klamath Basin Science Conference, Pages 1-30 in: Proceedings of the Klamath Basin Science Conference, Medford, Oregon, February 1–5, 2010: U.S. Geological Survey Open-File Report 2011-1196, 312 p. July 2011
Takekawa, J. Y., A. K. Miles, D. H. Schoelhamer, N. D. Athearn, M. K. Saiki, W. G. Duffy, S. Kleinschmidt, G. G. Shellenbarger and C. A. Jannusch. 2006. Trophic structure of avian communities across a salinity gradient in evaporation ponds of the San Francisco Bay estuary. Hydrobiologia 567:307-327. April 2006
Stanford, J., Duffy, W., Asarian, E., Cluer, B., Detrich, P., Eberle, L., Edmondson, S., Foott, S., Hampton, M., Kann, J., Malone, K., and Moyle, P., 2011, Conceptual Model for Restoration of the Klamath River, Pages 151-184 in: An overview of the Klamath Basin Science Conference, Pages 1-30 in: Proceedings of the Klamath Basin Science Conference, Medford, Oregon, February 1–5, 2010: U.S. Geological Survey Open-File Report 2011-1196, 312 p. July 2011
Spence, B.C., W.G. Duffy, J.C. Garza, B.C. Harvey, S.M. Sogard, L.A. Weitkamp, T.H. Williams, and D.A. Bouthton. 2011. Historical occurrence of coho salmon (Oncorhynchus kisutch) in streams of the Santa Cruz Mountain region of California: response to an Endangered Species Act petition to delist coho salmon south of San Francisco Bay. Technical Memorandum, National Marine Fisheries Service, Southwest Fisheries Science Center, Santa Cruz, CA. July 2011
Railsback, S. F., R. H. Lamberson, B. C. Harvey and W. G. Duffy. 2001. Reply to discussion on movement reules for individual-based models of stream fish. Ecological Modeling 143:249-251. December 2001
Pope, K. L., J. L. Brown, W. G. Duffy and P. H. Michaletz. 2001. A caloric-based evaluation of diet indices. Environmental Biology of Fishes. 61:329-339. August 2001
Moore, J. W., S. A. Hayes, W. G. Duffy, S. Gallagher, S. Ricker, and D. Wright. Nutrient fluxes and the recent collapse of coastal California salmon populations | Abstract July 2011
Hodge, B.W., M.A. Wilzbach, W.G. Duffy, R.M. Quiñones, and J.A. Hobbs. Life history diversity in Klamath River steelhead. Transactions of the American Fisheries Society 145:227-238, 2016. | Download February 2016
Hodge, B., M.A. Wilzbach, and W.D. Duffy. 2013. Potential fitness benefits of the half-pounder life history in Klamath River steelhead. Transactions of the American Fisheries Society, 2014. 143:864-875, 2014. | Abstract | Download June 2014
Gleason, R. A., N. H. Euliss, Jr., D. E. Hubbard and W. G. Duffy. 2004. Invertebrate egg banks of restored, natural, and drained wetlands in the Prairie Pothole Region of the United States. Wetlands 24:562-572. September 2004
Gleason, R. A., N. H. Euliss, Jr., D. E. Hubbard and W. G. Duffy. 2003. Effects of sediment load on emergence of aquatic invertebrates and plants from wetland soil egg and seed banks. Wetlands 23:26-34. April 2003
Euliss, N. H., Jr., L. M. Smith, S. Liu, W. G. Duffy, S. P. Faulkner, R. A. Gleason and S. D. Eckles. 2008. Integrating estimates of ecosystem services from conservation programs and practices into models for decision makers: The vision for CEAP Wetlands. Ecological Applications (In Press). | Abstract | Publisher Website March 2011
Duffy, W.G., Kahara, S.N. and Records, R.M., eds., 2011, Conservation Effects Assessment Project-Wetlands assessment in California's Central Valley and Upper Klamath River Basin: U.S. Geological Survey Open-File Report 2011-1290, 128 p. | Abstract | Download | Publisher Website October 2011
Duffy, W. and Thorsteinson, L., 2011, Synthesis of information needs and science priorities, Pages 185-198 in: Proceedings of the Klamath Basin Science Conference, Medford, Oregon, February 1–5, 2010: U.S. Geological Survey Open-File Report 2011-1196, 312 p. July 2011
Duffy, W. G., and S. N. Kahara. 2008. Wetland ecosystems in California's Central Valley and impications for wetland reserve program conservation practices. Ecological Applications (Preprint on line 8/5/2010). | Abstract | Publisher Website March 2011
Duffy, W. G., and E. P. Bjorkstedt. Demographics of Coastal Cutthroat Trout, Oncorhynchus clarki clarki, in Prairie Creek, California. In Press. Proceedings of the 2nd Conference on Sea Run Cutthroat Trout, Port Townsend, WA, 29 Sept - 1 Oct, 2005. | Abstract August 2008
Bell, E., and W. G. Duffy. 2007. Previously undocumented two-year freshwater residency of juvenile coho salmon in California. Transactions of the American Fisheries Society 136:966-970. | Abstract January 2008
Bell, E., W. G. Duffy and T. D. Roelofs. 2001. Fidelity and survival of juvenile coho salmon in response to a flood. Transactions of the American Fisheries Society. 130:450-458. October 2001
Project Completion Date
Redwood Creek Life Cycle Monitoring - DIDSON March 2015
Assessing the Benefits of USDA Conservation Programs in the Upper Klamath River Basin and Central Valley of California on Ecosystem Services June 2015
Upper Redwood Creek Juvenile Salmonid Abundance Project March 2014
Lower Redwood Creek Juvenile Salmonid Abundance Project March 2014
Prairie Creek Sub-Basin Life Cycle Monitoring Project, 2011 March 2014
Prairie Creek Sub-Basin Life Cycle Monitoring Project March 2012
Evaluating Dynamics of Grassland and Wetland Ecosystems in the Northern Great Plains December 2015
Redwood Creek Life Cycle Monitoring - DIDSON March 2014
Effects of conservation programs on amphibian communities in seasonal wetlands of the Prairie Pothole Region's glaciated plains June 2008
Klamath REMS, Fisheries September 2013
Assessing the effects of USDA conservation practices on wetland ecosystem services in CA's Central Valley August 2011
Technical Publications Publication Date
Williams, T.H., B. Spence, W. Duffy, D. Hillemeier, G. Kautsky, T. Lisle, M. McCain, T. Nickelson, E. Mora, and T. Pearson. 2007. Framework for assessing viability of threatened coho salmon in the southern Oregon/northern California coasts evolutionarily significant units. National Marine Fisheries Service, Southwest Fisheries Science Center, Santa Cruz, CA. February 2007
Williams, T. H., E. P. Bjorkstedt, W. G. Duffy, D. Hillemeir, G. Kautsky, T. Lisle, M. McCain, M. Rhode, R. G. Szerlong, R. Schick, M. Goslin and A. Agrawal. 2006. Historical population structure of coho salmon in the Southern Oregon/Northern California coasts evolutionarily significant unit. U. S. Department of Commerce, NOAA Technical Memorandum NMFS-SWFSC-390. October 2006
Williams, T. H., B. C. Spence, W. G. Duffy, D. Hillemeier, G. Kautsky, T. Lisle, M. McCain, T. Nickelson, G. Garman, E. Mora, and T. Pearson. 2008. Framework for assessing viability of threatened coho salmon in the Southern Oregon/Northern California Coast Evolutionarily Significant Unit. U. S. Department of Commerce, NOAA Technical Memorandum NMFS-SWFSC (In Press). January 2008
Sparkman, M.D. 2012. Lower Redwood Creek Juvenile salmonid (smolt) abundance project 2004 - 2011 seasons. January 2012
Sparkman, M.D. 2011. Lower Redwood Creek Juvenile salmonid (smolt) abundance project 2004-2010 Seasons October 2011
Kahara, S.N., Duffy, W., DiGaudio, R. and Records, R. 2012. Climate, Management, and Habitat Associations of Avian Fauna in Restored Wetlands of California's Central Valley, USA. Appraisal of Approaches for the Management of Biodiversity and Life Support Systems. Diversity, ISSN 1424-2818, 23 pp. November 2012
Duffy, W.G., M.A. Wilzbach, M. Wheeler and S. Frazey. 2003. Watershed restoration validation monitoring protocols for California. California Department of Fish and Game, Sacramento. February 2003
Duffy, W.G. and M.A. Wilzbach. 2004. A standard weight equation for juvenile coho salmon. California Department of Fish and Game, Sacramento. July 2004
Role and Organization Individual         Start Date        End Date       
Society for Wetland Scientists - Member, committee to evaluate student grant proposals, 2005-2007 Duffy January 1984 Present
North American Benthological Society - Member Duffy January 1977 December 2004
Ecological Society of America - Member Duffy January 1980 December 2003
American Fisheries Society - Member, Humboldt Chapter Duffy January 1998 December 2006
American Fisheries Society - Member publications committee, 2008 - present. Duffy January 1977 Present
American Fisheries Society - Chair, External Affairs Committee Duffy September 2010 August 2012
American Association for the Advancement of Science - Member Duffy January 1992 December 2001