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
Personal website

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.

Teaching Interest

Dr. Duffy teaches courses in fish bioenergetics and restoration ecology of river fishes.

Research Interest

Ecosystem energetic processes, the ecology of Pacific salmon, watershed restoration and wetland ecology.

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. 2001-02-28
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. 2001-06-30
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 2008-12-31
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. 2011-07-31
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. 2011-07-31
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. 2006-04-30
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. 2011-07-31
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. 2011-07-31
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. 2001-12-31
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. 2001-08-31
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 2011-07-31
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 2016-02-28
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 2014-06-30
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. 2004-09-30
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. 2003-04-30
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 2011-03-31
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 2011-10-31
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. 2011-07-31
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 2011-03-31
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 2008-08-31
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 2008-01-31
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. 2001-10-31
Presentations Presentation Date
Bryant, R, N. H. Euliss, Jr. 2013. Modeling native bumblebee habitat in North Dakota. North Dakota Users Conference 2013, Grand Forks, N.D., September 10 - 12, 2013. 2013-09-11
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. 2007-02-28
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. 2006-10-31
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). 2008-01-31
Sparkman, M.D. 2012. Lower Redwood Creek Juvenile salmonid (smolt) abundance project 2004 - 2011 seasons. | Download 2012-01-31
Sparkman, M.D. 2011. Lower Redwood Creek Juvenile salmonid (smolt) abundance project 2004-2010 Seasons | Download 2011-10-31
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. | Download 2012-11-30
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. 2003-02-28
Duffy, W.G. and M.A. Wilzbach. 2004. A standard weight equation for juvenile coho salmon. California Department of Fish and Game, Sacramento. 2004-07-31