Abstract Title

Session S-09D: Salmon Recovery: Implementation and Progress II

Keywords

Species and Food Webs

Start Date

2-5-2014 10:30 AM

End Date

2-5-2014 12:00 PM

Description

Growing evidence suggests juvenile Chinook salmon (Oncorhynchus tshawytscha), can utilize portions of both freshwater and salt water components of estuaries before full seaward migration. However a clear link between juvenile outmigration strategies (early fry, late parr) and successful returning adults has not been made. To test the hypothesis that early migrants (and potentially estuary rearing juveniles) contribute to adult populations, we recovered adult otolith samples on the spawning grounds of selected Salish Sea and Columbia River tributaries. Laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) was used to analyze chemical patterns in otoliths. Otolith microchemistry was used to estimate the size and timing of juvenile outmigration for selected adult populations. Furthermore residency within the freshwater portion of the Columbia River estuary was estimated based on recoveries of strontium chloride marked adult otoliths from the Coweeman River.

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May 2nd, 10:30 AM May 2nd, 12:00 PM

Juvenile Life History Strategies of Selected Chinook Salmon Spawning Populations within Puget Sound and the Columbia River, as Inferred From Otolith Microchemistry

Room 611-612

Growing evidence suggests juvenile Chinook salmon (Oncorhynchus tshawytscha), can utilize portions of both freshwater and salt water components of estuaries before full seaward migration. However a clear link between juvenile outmigration strategies (early fry, late parr) and successful returning adults has not been made. To test the hypothesis that early migrants (and potentially estuary rearing juveniles) contribute to adult populations, we recovered adult otolith samples on the spawning grounds of selected Salish Sea and Columbia River tributaries. Laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) was used to analyze chemical patterns in otoliths. Otolith microchemistry was used to estimate the size and timing of juvenile outmigration for selected adult populations. Furthermore residency within the freshwater portion of the Columbia River estuary was estimated based on recoveries of strontium chloride marked adult otoliths from the Coweeman River.