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

California Staff Member


Nicholas A. Som

Nicholas Som

Unit Leader
Phone: (707) 826 - 5645
Email: nsom@usgs.gov
Faculty Email: nicholas.som@humboldt.edu
Faculty Website

Education

  • Ph D Oregon State University 2009
  • MS Washington State University 2002
  • BS Regis University 2000

Biography

Nicholas joined the CRU in November of 2023, as the Unit Leader of the California Cooperative Fish and Wildlife Research Unit, and faculty in the Department of Fisheries Biology at California Polytechnic University, Humboldt where he’s had a long history of service and science collaboration. Nicholas’ educational history includes an undergraduate mathematics degree from Regis University, a master’s degree in statistics from Washington State University, and he received his Ph.D. from Oregon State University where he studied time-series and spatial statistics for data originating from stream and river networks. Prior to joining the CRU, Nicholas was a statistician and program lead for the fish and aquatic conservation program at the Arcata US Fish and Wildlife office.

Nicholas’ research focuses on answering ecological questions with quantitative tools aimed to inform resource management decision makers. His main interests include water management and the ecology of pacific salmon, and his work includes both methods development and applied science projects. His applied work has ranged from the Columbia to Sacramento Rivers, but with most attention on the Klamath Basin. He frequently works on models for aquatic habitat, population dynamics, and disease dynamics.

Nicholas teaches graduate courses on statistical methods common to fish and wildlife projects, such generalized linear models, applied Bayesian modeling, etc.

Areas of Expertise

Decision Support/Analysis, Disease/Parasites, Ecological Flows, Fisheries Management, Habitat Management, Managed Flows/Hydrology, Population Dynamics, Species Distribution Modeling, Statistics and Modelling, Stream Ecology, T&E Species Management

Taxon Groups Studied

Anadromous Fishes, Freshwater Fishes, Salmonids

Research Publications Publication Date
Van Vleet, N. P., Ward, D. M., Som, N. A., Barton, D. C., Anderson, C., & Henderson, M. J. (2024). It's about time: A multistate semicontinuous time mark–recapture model to evaluate seasonal survival and movement rates of juvenile Coho Salmon in a small coastal watershed. Transactions of the American Fisheries Society, 153, 541–1. https://doi.org/10.1002/tafs.10471 | Abstract August 2024
Som, N.A., Zégre, N.P., Ganio, L.M. and Skaugset, A.E., 2012. Corrected prediction intervals for change detection in paired watershed studies. Hydrological Sciences Journal, 57 (1), 134–143. doi: 10.1080/02626667.2011.637494. | Abstract | Download January 2012
Som, N.A. 2024. Applications of a disease-induced mortality model to inform regulatory compliance of the Klamath Project. | Download March 2024
Smit, R. B., Goodman, D. H., Boyce, J., & Som, N. A. 2024. Effects of 2D
hydrodynamic model resolution on habitat estimates for rearing Coho Salmon in contrasting channel forms. River Research and Applications 40(10): 1912-1924. https://doi.org/10.1002/rra.4341
July 2024
Malakauskas, D. M., Willson, S. J., M. A. Wilzbach, and N. A. Som. 2013. Flow variation and substrate type affect dislodgement of the freshwater polychaete, Manayunkia speciosa. Freshwater Science 2013, 32(3):862-873 | Download June 2013
Presentations Presentation Date
Walden, M.A. and N.A. Som. 2024. Evaluating alternative methods for modeling trap efficiencies of outmigrating juvenile salmonids. Ecological Society of American Annual Meeting. Long Beach, CA. August 2024
Som, N.A. 2024. Monitoring to science to management: science-informed decision making to combat an aquatic parasite. Trinity River Restoration Program Science Symposium. May 2024
Som, N.A. 2024. Modeling Habitat of an Invertebrate Host of Salmonid Parasites to Inform Management Decision Making. American Fisheries Society Annual Meeting. Honolulu, HI. September. September 2024
Sascha L. Hallett Jerri L. Bartholomew, Julie D. Alexander, Justin Alvarez, Stephen D. Atkinson, Michael Belchik, Sarah J. Bjork, J. Scott Foott, Alex Gonyaw, Mark E. Hereford, Richard A. Holt, Barry McCovey Jr., Nicholas A. Som, Toz Soto, Anne Voss, Thomas H.Williams, Ted G. Wise. 2024. Disease risk for salmonids after reconnection of the Klamath Basins. American Fisheries Society Western Fish ​Disease Workshop. Boise, ID. July 30 - August 1, 2024. August 2024
Sascha L. Hallett Jerri L. Bartholomew, Julie D. Alexander, Justin Alvarez, Stephen D. Atkinson, Michael Belchik, Sarah J. Bjork, J. Scott Foott, Alex Gonyaw, Mark E. Hereford, Richard A. Holt, Barry McCovey Jr., Nicholas A. Som, Toz Soto, Anne Voss, Thomas H.Williams, Ted G. Wise. 2024. Dam Removal and Ecological Transformation on the Klamath River. American Fisheries Society Annual Meeting. Honolulu, HI. September 2024. September 2024
King, B., O'Dowd, A., Laskodi, C., Ward, D., Som, N.A. 2024. Effects of scour and marginal habitat inundation of Trinity River Invertebrate communities. Salmon Restoration Federation Annual Meeting. Santa Rosa, CA. March 2024
Damon Goodman, Nicholas A. Som, Cyril Michel, Keith Denton. 2023. Evaluating the effectiveness of dam removal on the Klamath River through sonar and radio telemetry. Klamath Basin Monitoring Program Annual Meeting. Klamath Falls, OR. November 2023