Northwest Fisheries Science Center

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Document Type: Journal Article
Center: NWFSC
Document ID: 4633
Title: Using state-space models to evaluate multiple survey methods: a case study for a threatened population of Chinook salmon (Oncorhynchus tshawytscha) in Johnson Creek, Idaho
Author: Brandon Chasco, E. J. Ward, Craig Rabe, Ryan Kinzer, Jason Vogel, J. A. Hesse, Paul Kucera
Publication Year: 2014
Journal: North American Journal of Fisheries Management
Keywords: salmon monitoring

 Multiple survey methods for determining population status are frequently used to monitor endangered species. Determining the relative effectiveness of the different methods is critical to the recovery effort. The Johnson Creek Chinook salmon population is threatened under the Endangered Species Act and trends in population abundance are currently being monitored using four different survey methods. Using state-space models we estimate the observation error associated with each method. Multi-pass redd count surveys appear to have lower observation error compared to single pass redd count surveys, or mark-recapture estimates. The risk of making incorrect management decisions relative to the recovery goals for population abundance is low for the Johnson Creek population of Chinook salmon. This method is applicable across taxa for which multiple survey methods exist, and can inform co-managers about the effectiveness and risks associated with using popular methods for monitoring abundance trends. The results from our of analysis can be used inform co-managers about the status of the hundreds of threatened salmon populations in the Pacific Northwest that use redd count surveys and mark-recapture survey methods.









Theme: Recovery, Rebuilding and Sustainability of Marine and Anadromous Species
Foci: Develop methods to use physiological and biological information to predict population-level processes.