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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Short-term exposure to elevated pCO_2 does not affect the valve gaping response of adult eastern oysters, Crassostrea virginica, to acute heat shock under an ad libitum feeding regime
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Short-term exposure to elevated pCO_2 does not affect the valve gaping response of adult eastern oysters, Crassostrea virginica, to acute heat shock under an ad libitum feeding regime

机译：短期暴露于升高的pCO_2不会影响成年东部牡蛎（Crassostrea virginica）在任意喂养条件下对急性热休克的气门张开反应

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摘要

While many studies document effects of elevated pCO(2) on coastal organisms, the environmental variability characteristic of coastal regions is often not directly tested. We tested for effects of elevated pCO(2) on the valve gaping activity of adult eastern oysters (Crassostrea virginica) in response to acute heat shock that can occur in nearshore shallow coastal waters. In two consecutive experimental trials, oysters (n = 4) wired with Hall Effect biosensors (that measured valve gaping at one-second intervals) were exposed for 10 days at six different pCO(2) treatments spanning a range currently observed in nearshore coastal regions, and predicted under near-future ocean acidification. After the 10-day acclimation period, oysters from each pCO(2) treatment were exposed to a 3-h heat shock assay (11-12 - 30 degrees C) and valve gaping activity was monitored continuously. During the heat shock assays, valve gaping activity increased with increasing temperature and then ceased when temperature was reduced back to 11-12 degrees C; however, these valve gaping rate increases during heat shock were not characteristic of overly-stressed oysters. Exposure to elevated pCO(2) had no effect on the valve gaping response of oysters to acute heat shock. Our results suggest that the valve gaping responses of adult eastern oysters to acute temperature increases are unaffected by short-term elevations in seawater pCO(2). Future studies incorporating the roles of local adaptation, food availability, and direct functional consequences of valve gaping (e.g. physiological rates, predator avoidance, response to environmental toxins) are warranted.
机译：虽然许多研究记录了pCO（2）升高对沿海生物的影响，但沿海地区的环境变异性特征通常并未得到直接测试。我们测试了升高的pCO（2）对成年东部牡蛎（Crassostrea virginica）的气门裂隙活动的影响，以应对可能在近岸浅海沿岸发生的急性热激。在两个连续的实验试验中，使用霍尔效应生物传感器（以一秒为间隔测量阀门间隙）连接的牡蛎（n = 4）在六种不同的pCO（2）处理下暴露了10天，这些处理跨越了近岸沿海地区目前观察到的范围，并预测在不久的将来海洋酸化。经过10天的适应期后，将每种pCO（2）处理中的牡蛎暴露于3小时的热休克试验（11-12-> 30摄氏度）中，并持续监测气门间隙活动。在热冲击试验中，阀的间隙活动随温度的升高而增加，然后在温度降至11-12摄氏度时停止。但是，在热冲击过程中，这些阀的开度增加并不是牡蛎过分强调的特征。暴露于升高的pCO（2）对牡蛎对急性热激的气门间隙响应没有影响。我们的结果表明，成年东部牡蛎对急性温度升高的气门间隙响应不受海水pCO（2）短期升高的影响。未来的研究应结合局部适应，食物供应和瓣膜裂开的直接功能后果（例如生理速率，避免捕食者，对环境毒素的反应）的作用。

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