Programa de Pós-Graduação Em Ecologia, Universidade Federal de Santa Catarina, Florianópolis, Brazil.
Departamento de Bioquímica, Universidade Federal de Santa Catarina, Florianópolis, Brazil.
Mar Environ Res. 2020 Apr;156:104898. doi: 10.1016/j.marenvres.2020.104898. Epub 2020 Jan 25.
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.
温度极值升高或降低对双壳贝类的影响取决于它们对环境温度变化做出生理生化响应的能力。我们在夏季和冬季实验条件下，测试了贻贝 Anomalocardia flexuosa 对模拟海洋热浪和寒冷期的响应。我们在两次各持续 43 天的生物测定中，寻找有关生理生化参数以及存活率的信息。冬季寒冷期模拟表明，极端温度作为生理生化刺激因素，与代谢率增加相关，从而导致适应策略下的更高维持成本。另一方面，夏季热浪极端温度超过了个体的热耐受极限，导致无法适应和高死亡率。这些实验表明，贻贝 A. flexuosa 可以被视为热浪事件的敏感指标。
