Cardiac performance mirrors the passive thermal tolerance range in the oyster Ostrea edulis.

ABSTRACT: Increasing frequencies of heatwaves threaten marine ectotherm species but not all alike. In exposed habitats, some species rely on a higher capacity for passive tolerance at higher temperatures, thereby extending time-dependent survival limits. Here, we assessed how the involvement of the cardiovascular system in extended tolerance at the margins of the thermal performance curve is dependent on warming rate. We studied organismal and heart tissue cellular responses of the European oyster, Ostrea edulis, challenged by rapid warming (+2°C per hour) and gradual warming (+2°C per 24 h). Starting at 22°C, cardiac activity was monitored as temperature was increased, tracking cardiac performance curves. Hearts were collected at discrete temperatures to determine cardiomyocyte metabolic profiles.

SUBMITTER: Gotze S 

PROVIDER: S-EPMC11832122 | biostudies-literature | 2025 Jan

REPOSITORIES: biostudies-literature