Mussels close their shell as a protective strategy and the quantification of this behavioral marker may represent an alarm signal when they are exposed to environmental stressors. In the present study, we investigated the ability of the Mediterranean mussel Mytilus galloprovincialis to recover and then the resilience or inertia of valve activity after a pulsing exposition to diverse levels of salinity (5, 10, 20, and 35 PSU as reference value). The trial simulated an event of drastic and sudden reduction of seawater salinity thus mimicking an event of flash flood from intense rain. Valve gaping and movements were measured in continuous cycle for 10 days using a customized magneto‐electric device which uses Hall sensors. Results showed that under normal conditions of salinity (35 PSU), the general pattern of valve movements was a continuously open state with sporadic spikes indicating a closing motion. At salinity of 5, PSU mussels reacted by closing their valves, leading to a 77% mortality on the 4th day. At salinity of 10, PSU animals were observed with closed valves for the entire duration of the exposure and no mortality occurred, they showed a significant reduction in the valve activity once the reference value of salinity was re‐established. In contrast, salinity of 20 PSU did not trigger a significant behavioral response. Interestingly, there no define rhythms of valve movements were recorded during salinity challenges.

中文翻译：

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用霍尔传感器测量河豚的溢洪模拟和阀门性能

贻贝关闭外壳作为一种保护策略，当它们受到环境压力时，量化这种行为标记可能会表示一个警报信号。在本研究中，我们研究了地中海贻贝Mytilus galloprovincialis的能力。脉冲暴露于不同盐度水平（5、10、20和35 PSU作为参考值）后恢复，然后恢复阀门活动的弹性或惯性。该试验模拟了海水盐度急剧急剧下降的事件，从而模拟了暴雨造成的山洪暴发。使用霍尔传感器的定制磁电设备连续10天测量阀门的间隙和运动。结果表明，在正常盐度（35 PSU）条件下，气门运动的一般模式是连续打开状态，偶有尖峰表明关闭运动。在盐度为5时，PSU贻贝通过关闭其阀门进行反应，导致第4天的死亡率为77％。在盐度为10时，在暴露的整个过程中，均在关闭的阀门中观察到PSU动物，并且没有发生死亡，一旦恢复盐度的参考值，它们就会显示出阀门活性的显着降低。相比之下，20 PSU的盐度并未引发明显的行为反应。有趣的是，在盐分挑战期间没有记录到阀门运动的明确节奏。