Walter G. Duffy

Photo Walt Duffy

 

Adjunct Professor


Education

  • B.S. Fisheries & Wildlife, Michigan State University, 1973
  • M.S. Fisheries & Wildlife, Michigan State University, 1975
  • PhD. Fisheries & Wildlife, Michigan State University, 1985


Courses taught at HSU

  • FISH 480/580 Restoring River Fisheries


Current Research Interests

  • Ecosystem energetic processes
  • Ecology of Pacific salmon
  • Watershed restoration


Selected Publications

  • Groff, L.A., Duffy, W.G., Kahara, S.N. and Chapin, S.J. Temporally irregular breeding of western spadefoot toads (Spea hammondii) in managed wetlands. Northwestern Naturalist (in press).

  • Duffy, W., Kahara, S. and Records, R., eds., 2011. Conservation effects assessment project—wetlands assessment in California’s Central Valley and Upper Klamath River Basin. Open-File Report 2011-1290, U.S. Geological Survey, Reston, VA, 128 p.

  • Duffy, W.G. , Bjorkstedt, E.P. and Ellings, C.S. 2011. Predation on juvenile Pacific salmon Oncorhynchus spp. in downstream migrant traps in Prairie Creek, California', North American Journal of Fisheries Management, 31: 1, 151 — 164.

  • Moore, J.W., Hayes, S.A., Duffy, W.G., Gallagher, S., Michel, C.J., and Wright, D. 2011. Nutrient fluxes and the recent collapse of coastal California salmon populations. Canadian Journal of Fisheries, 68:1161-1170.

  • 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.

  • 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.

  • 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.

  • 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.

  • Spence, B.C., Duffy, W.G., Garza, J.C., Harvey, B.C., Sogard, S.M., Weitkamp, L.A., Williams, T.H., and Bouthton, D.A. 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.

  • Duffy, W. G., and S. N. Kahara. 2011. Freshwater wetlands in California’s Central Valley: a review of ecosystem services. Ecological Applications, 21,3 S21-S30. http://www.esajournals.org/doi/pdf/10.1890/09-1338.1

  • Euliss, N.H., Jr., L.M. Smith, S. Liu, W.G. Duffy, S.P. Faulkner, R.A. Gleason and S.D. Eckles. 2011. Integrating estimates of ecosystem services from conservation programs and practices into models for decision makers: The vision for CEAP Wetlands. Ecological Applications, Ecological Applications, 21,3 S128-S134. http://www.esajournals.org/doi/pdf/10.1890/09-0285.1

  • Duffy, W.G., and E.P. Bjorkstedt. 2008. Demographics of coastal cutthroat trout, Oncorhynchus clarki clarki, in Prairie Creek, California. Pages 100 – 106 In: P.J. Connolly, T.H. Williams and R.E. Greswell editors. The 2005 coastal cutthroat trout symposium: biology, status, management and conservation. Oregon Chapter, American Fisheries Society, Portland.

  • 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.

  • 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.

  • Williams, T.H., E.P. Bjorkstedt, W.G. Duffy, D. Hillemeier, G. Kautsky, T. Lisle, M. McCain, M. Rode, R.G. Szerlong, R. Schick, M. Goslin and A. Agrawal. 2006. Historical population structure of coho salmon in the Southern Oregon/Northern California coasts evolutionary significant unit. U.S. Department of Commerce, NOAA Technical Memorandum NMFS-SWFSC-390.

  • Takekawa, J.Y., A.K. Miles, D.H. Schoellhamer, N.D. Athearn, M.K. Saiki, W. G. Duffy, S. Kleinschmidt, G.G. Shellenbarger and C.A. Jannusch. 2006. Trophic structure and avian communities across a salinity gradient in evaporation ponds of the San Francisco Bay estuary. Hydrobiologia 2006:307-327.

  • 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.

  • Duffy, W. G.  1998. Population dynamics, production and prey consumption by fathead minnows in prairie wetlands: a bioenergetics approach. Canadian Journal of Fisheries and Aquatic Sciences 54: 1-13.

  • Duffy, W. G. 1999. Wetlands of Yellowstone and Grand Teton National Parks: aquatic invertebrate diversity and community structure. Wetland Aquatic Invertebrates: Ecology and Management 733-756.

  • Duffy, W. G. and E. P. Bjorkstedt.  Demographics of coastal cutthroat trout, Oncorhynchus clarki clarki, in Prairie Creek, California.  Proceedings of the 2nd Conference on Sea Run Cutthroat Trout, Port Townsend, WA, 29 Sept. – 1 Oct., 2005.  Accepted 2007.

  • Gleason, R. A., N. H. Euliss Jr., D. E. Hubbard, and W. G. Duffy. 2002. The invertebrate egg banks of restored, natural and drained wetlands in the Prairie Pothole region of the United States. Wetlands 24:562-572.

  • Gleason, R. A., N. H. Euliss Jr., E. E. Hubbard, and W. G. Duffy. 2002. Effects of sediment load on emergence of aquatic invertebrates and plants from wetland soil egg and seed banks. Wetlands 23:26-34.

  • 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.

  • Railsback, S. F., R. H. Lamberson, B. C. Harvey, and W. G. Duffy. 1999. Movement rules for spatially explicit individual-based stream fish models. Ecological Modeling 123: 73-89.

  • Railsback, S. F., R. H. Lamberson, B. C. Harvey, and W. G. Duffy. 2001. Reply to discussion on movement rules for individual-based models of stream fish. Ecological Modeling 143: 249-251.

  • 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 (2006) 567:307-327.

  • 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.

  • 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.

Contact:  Walter.Duffy@humboldt.edu