DATA AVAILABILITY STATEMENT
All stable isotope data for zooplankton and fish bone collagen are
provided in the Supplementary Information. Raw isotopic data of
zooplankton samples and fish bone collagen will be deposited in the
Dryad Digital Repository and the data DOI will be included at the end of
the article before publication. The custom code used to estimate chum
salmon migration routes is provided in the Supplementary Information.