Effects of incubation temperature on the upper thermal tolerance of the imperiled longfin smelt (Spirinchus thaleichthys).

ABSTRACT: Upper thermal limits in many fish species are limited, in part, by the heart's ability to meet increased oxygen demand during high temperatures. Cardiac plasticity induced by developmental temperatures can therefore influence thermal tolerance. Here, we determined how incubation temperatures during the embryonic stage influence cardiac performance across temperatures during the sensitive larval stage of the imperiled longfin smelt. We transposed a cardiac assay for larger fish to newly hatched larvae that were incubated at 9°C, 12°C or 15°C. We measured heart rate over increases in temperature to identify the Arrhenius breakpoint temperature (T_AB), a proxy for thermal optimum and two upper thermal limit metrics: temperature when heart rate is maximized (T_peak) and whe

SUBMITTER: Yanagitsuru YR 

PROVIDER: S-EPMC10858410 | biostudies-literature | 2024

REPOSITORIES: biostudies-literature