Thermal exposure of adult Chinook salmon and steelhead: Diverse behavioral strategies in a large and warming river system.

ABSTRACT: Rising river temperatures in western North America have increased the energetic costs of migration and the risk of premature mortality in many Pacific salmon (Oncorhynchus spp.) populations. Predicting and managing risks for these populations requires data on acute and cumulative thermal exposure, the spatio-temporal distribution of adverse conditions, and the potentially mitigating effects of cool-water refuges. In this study, we paired radiotelemetry with archival temperature loggers to construct continuous, spatially-explicit thermal histories for 212 adult Chinook salmon (O. tshawytscha) and 200 adult steelhead (O. mykiss). The fish amassed ~500,000 temperature records (30-min intervals) while migrating through 470 kilometers of the Columbia and Snake rivers en route to spawning sites

SUBMITTER: Keefer ML 

PROVIDER: S-EPMC6150539 | biostudies-literature | 2018

REPOSITORIES: biostudies-literature