Cardiac performance mirrors the passive thermal tolerance range in the oyster, Ostrea edulis DOI Creative Commons
Sandra Götze, Carl J. Reddin,

Isabel Ketelsen

и другие.

Journal of Experimental Biology, Год журнала: 2024, Номер unknown

Опубликована: Дек. 24, 2024

Increasing frequencies of heatwaves threaten marine ectotherm species but not all alike. In exposed habitats, some rely on a higher capacity for passive tolerance at temperatures, thereby extending time-dependent survival limits. Here we assess how the involvement cardiovascular system in extended margins thermal performance curve is dependent warming rate. We study organismal and heart tissue cellular responses European oyster, Ostrea edulis, challenged by rapid (+2°C/h) gradual (+2°C/24h). Starting 22°C, cardiac activity was monitored as temperature increased, tracking curves. Hearts were collected discrete temperatures to determine cardiomyocyte metabolic profiles. Heart rate peaked lower ABT 30.5°C under than 33.9°C warming. However, oysters survived warming, with half dying (LT50) 36.9°C versus 34.8°C, respectively. As passed 30°C, rates fell profiles suddenly changed switched anaerobic metabolism survival. By 36°C, severe fluctuations Krebs-cycle-related metabolites accompanied failure. contrast, made gradual, extensive adjustments intracellular pathways, prolonging aerobic temperatures. This duration ABT, beyond which decreased sharply ceased. Our results emphasize forces tradeoff between maxima duration, via cellular-level impacts. possess adaptations that enable intertidal populations.

Язык: Английский

Cardiac performance mirrors the passive thermal tolerance range in the oyster, Ostrea edulis DOI Creative Commons
Sandra Götze, Carl J. Reddin,

Isabel Ketelsen

и другие.

Journal of Experimental Biology, Год журнала: 2024, Номер unknown

Опубликована: Дек. 24, 2024

Increasing frequencies of heatwaves threaten marine ectotherm species but not all alike. In exposed habitats, some rely on a higher capacity for passive tolerance at temperatures, thereby extending time-dependent survival limits. Here we assess how the involvement cardiovascular system in extended margins thermal performance curve is dependent warming rate. We study organismal and heart tissue cellular responses European oyster, Ostrea edulis, challenged by rapid (+2°C/h) gradual (+2°C/24h). Starting 22°C, cardiac activity was monitored as temperature increased, tracking curves. Hearts were collected discrete temperatures to determine cardiomyocyte metabolic profiles. Heart rate peaked lower ABT 30.5°C under than 33.9°C warming. However, oysters survived warming, with half dying (LT50) 36.9°C versus 34.8°C, respectively. As passed 30°C, rates fell profiles suddenly changed switched anaerobic metabolism survival. By 36°C, severe fluctuations Krebs-cycle-related metabolites accompanied failure. contrast, made gradual, extensive adjustments intracellular pathways, prolonging aerobic temperatures. This duration ABT, beyond which decreased sharply ceased. Our results emphasize forces tradeoff between maxima duration, via cellular-level impacts. possess adaptations that enable intertidal populations.

Язык: Английский

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