2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/22/2018 | 11:15 AM - 11:30 AM | ISOLATED STREAM POOLS: A BOTTLENECK FOR SURVIVAL OF ENDANGERED COHO SALMON (ONCORHYNCHUS KISUTCH) IN NORTHERN CALIFORNIA | 310 B
ISOLATED STREAM POOLS: A BOTTLENECK FOR SURVIVAL OF ENDANGERED COHO SALMON (ONCORHYNCHUS KISUTCH) IN NORTHERN CALIFORNIA
As drying proceeds in intermittent rivers, isolated stream pools can form, stopping streamflow and generally subjecting resident biota to increased water temperature, lower dissolved oxygen and other potential limiting factors for survival. Identifying environmental factors and threshold values that trigger mortality in isolated pools is essential for predicting future effects of global change. For juvenile Coho salmon (Oncorhynchus kisutch), harsh environmental conditions in isolated pools could represent a bottleneck influencing the persistence of this endangered species. We used a mixed model approach to identify environmental factors that influenced juvenile Coho salmon survival in eight stream reaches within tributaries of the Russian River, California between 2011-2016. We then used classification trees to identify threshold values of factors that correlated with drastic reductions in survival when reached. Results indicated dissolved oxygen, flow (mean, min, max), wetted volume, and water temperature limited salmon survival across all stream reaches. Among these factors, dissolved oxygen and wetted volume had the greatest influence on survival with precipitous declines at < 5mg/L and < 20 m^3, respectively. Our results inform predictions on future salmon survival and help managers identify priority reaches for protection and enhancement.
- Disturbance
- Fragmentation
- Fish
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Presenters/Authors
Ross Vander Vorste
(), Rivers Study Center and Department of Biology - University of Wisconsin La Crosse , vandervorste.ross@gmail.com;
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Mariska Obedzinski
(), California Sea Grant, mobedzinski@ucsd.edu;
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Sarah Nossaman Pierce
(), California Sea Grant, snossamanpierce@ucsd.edu;
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Ted Grantham
(), University of California, Berkeley, tgrantham@berkeley.edu;
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Stephanie Carlson
(), Department of Environmental Science, Policy, and Management, University of California, Berkeley, California, U.S., smcarlson@berkeley.edu;
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