The incorporation of environmentally derived 87Sr/86Sr and Sr/Ca in early otolith formation of Chinook salmon

• DOI: 10.1111/eff.12673
• Publication Date: 2022-07-02T07:43:22Z
• Authors: Paul Chittaro; Jens Hegg; Abby Fuhrman; Devin Robichaux; Rothboury Doung; Brian Beckman; Chris Fisher; Jeff Vervoort; Brian Kennedy
• Keywords: Isotopes of strontium

Abstract Effective species management often requires understanding patterns of movement and habitat use. A common approach in identifying where individuals reside relies upon chemical tracers from the environment that are incorporated into an individual's tissues. For fish, isotopes their otoliths, specifically portion otolith formed during larval stage, have been used to identify natal origin. Complicating this work, however, is fact life there a shift source deposited onto growing maternally environmentally derived. The objective study was representing transition derived so as accurately investigate questions origin for threatened population fall Chinook salmon ( Oncorhynchus tshawytscha ). We exposed developing larvae four treatments differed terms water strontium isotope ratio 87 Sr/ 86 Sr) change‐point analysis Sr calcium (Sr/Ca) radius corresponding isotopes. Our results indicated occurred, on average, at 132 μm Sr; ±50 standard deviation) 127 (Sr/Ca; ±29 μm) core, which corresponded developmental time between hatching exogenous feeding. substantial proportion our otoliths (i.e., 61%) did not show convergence by end 113‐day experiment, likely due dietary contribution marine‐based feed. Therefore, we were unable recommend target purposes reconstructing apart being beyond approximately 130 μm.