2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
6/06/2017 | 10:15 AM - 10:30 AM | JUVENILE COHO SALMON LIFE HISTORY VARIATION IN A SPRING-FED NORTHERN CALIFORNIA RIVER | 301A
JUVENILE COHO SALMON LIFE HISTORY VARIATION IN A SPRING-FED NORTHERN CALIFORNIA RIVER
The Shasta River in northern California historically produced the largest populations of coho salmon in the Klamath River system. The river’s spring-dominated hydrology provides consistent inter and intra-annual flow and the thermal and chemical characteristics of the spring sources promote high primary and secondary productivity, resulting in rapid salmonid growth rates. However, surface water diversions and land use practices have degraded salmonid habitat. To describe current habitat utilization patterns and prioritize habitat restoration needs, we studied juvenile coho salmon movements using Passive Integrated Transponder (PIT) tags and a network of twenty PIT tag detection stations located at key locations throughout the Shasta River watershed. A variety of life history tactics were observed, likely resulting from favorable conditions provided by spring inflows and unfavorable conditions due to water use practices. We observed extensive downstream and upstream movements to access thermal refugia, and rapid growth resulting in apparent smoltification at age-0, which is atypical of coho salmon in adjacent watersheds. Understanding how life history variants contribute to population dynamics is critical for implementation of recovery efforts at appropriate temporal and spatial scales.
- C02 Fish and Other Aquatic Vertebrates
- C16 Restoration Ecology
- C28 Land-Water Interfaces & C29 Life Histories
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Presenters/Authors
Christopher Adams
(), Michigan Technological University, ccadams@mtu.edu;
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Bill Chesney
(), California Department of Fish and Wildlife, bill.chesney@wildlife.ca.gov ;
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Caitlin Bean
(), California Department of Fish and Wildlife, Caitlin.Bean@wildlife.ca.gov;
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