The effects of increasing or decreasing extreme temperatures on bivalves depend on their physiological and biochemical capacity to respond to changes in ambient temperature. We tested the response of the clam Anomalocardia flexuosa to simulated marine heat waves and cold spells, under summer and winter experimental conditions. We sought information about physiological and biochemical parameters, as well as survival rates during two bioassays of 43 days each. The winter cold spell simulations showed that extreme temperatures acted as a physiological and biochemical stimulus, linked to an increase in metabolic rates, and consequently higher maintenance costs, as acclimatory strategies. On the other hand, the summer heat wave extreme temperatures exceeded the individuals' thermal tolerance limits, resulting in an inability to acclimate and a high mortality. These experiments suggest that A. flexuosa can be considered as a sensitive indicator of heat wave events.

中文翻译：

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海洋热浪和冷拼事件对双壳双瓣弯曲异常的影响：季节性比较。

增加或降低双壳类动物的极端温度的影响取决于它们对环境温度变化做出反应的生理和生化能力。在夏季和冬季的实验条件下，我们测试了挠性蛤An异常对模拟海洋热浪和寒潮的响应。我们寻求有关生理和生化参数的信息，以及两次43天的生物测定中的存活率。冬季寒冷季节的模拟显示，极端温度是一种生理和生化刺激，与新陈代谢率的上升有关，因此，作为适应策略，其维护成本较高。另一方面，夏季热浪的极端温度超过了个人的耐热极限，导致无法适应环境并导致高死亡率。这些实验表明，挠曲曲霉可以被认为是热波事件的敏感指标。