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首页> 外文期刊>American Journal of Physiology >Hot and bothered: effects of elevated Pco_2 and temperature on juvenile freshwater mussels
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Hot and bothered: effects of elevated Pco_2 and temperature on juvenile freshwater mussels

机译：热和困扰：PCO_2升高的效果和少年淡水贻贝的温度

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摘要

Multiple environmental stressors may interact in complex ways to exceed or diminish the impacts of individual stressors. In the present study, the interactive effects of two ecologically relevant slressors [increased temperature and partial pressure of carbon dioxide (PCO_2)] were assessed for freshwater mussels, a group of organisms that are among the most sensitive and rapidly declining worldwide. The individual and combined effects of elevated temperature (22°C-34°C) and P_(co_2) (～230, 58,000 μatm) on juvenile Lampsilis sili-quoidea were quantified over a 5- or 14-day period, during which physiological and whole animal responses were measured. Exposure to elevated temperature induced a series of physiological responses, including an increase in oxygen consumption rates following 5 days of exposure at 31°C and an increase in carbonic anhydrase (ca) and heat shock protein 70 mRNA levels following 14 days of exposure at 28°C and 34°C, respectively. Treatment with elevated P_(co_2) activated acid-base regulatory responses including increases in CA and Na+-K+-ATPase activity and a novel mechanism for acid-base regulation during P_(co_2) exposure in freshwater mussels was proposed. Thermal and CO_2 stressors also interacted such that responses to the thermal stressor were diminished in mussels exposed to elevated P_(co_2), resulting in the greatest level of mortality. Additionally, larger mussels were more likely to survive treatment with elevated P_(co_2) and/or temperature. Together, exposure to elevated P_(co_2) may compromise the ability of juvenile freshwater mussels to respond to additional stressors, such as increased temperatures, highlighting the importance of considering not only the individual but also the interactive effects of multiple environmental stressors.
机译：多种环境压力源可以以复杂的方式互动以超过或减少个体压力源的影响。在本研究中，对淡水贻贝评估了两组生态相关疏水阀的互动效果[增加了二氧化碳（PCO_2）的温度和部分压力，这是全球最敏感和迅速下降的淡水贻贝。在5-14天的时间内定量了少年Lampsilis Sili-Quidea的升高温度（22℃-34℃）和P_（CO_2）（〜230,58,000μAtm）的个体和组合效果，在5或14天的时间内定量并测量整个动物反应。暴露于升高的温度诱导一系列生理反应，包括在31℃暴露5天后耗氧率的增加，并且在28时14天暴露后的碳酸酐酶（CA）和热休克蛋白70 mRNA水平。 °C和34°C分别。提出了用升高的P_（CO_2）活性酸碱调节反应的处理，包括CA和NA + -K + -ATP酶活性的增加，并提出了淡水贻贝中P_（CO_2）暴露期间的酸基调调节的新机制。热和CO_2应力源也相互作用，使得对热应激源的反应在暴露于升高的P_（CO_2）的贻贝中减少，导致最大程度的死亡率。另外，较大的贻贝更容易在升高的​​P_（CO_2）和/或温度下存活处理。暴露于升高的P_（CO_2）可能会损害少年淡水贻贝对额外压力源的能力，例如温度提高，突出了不仅考虑个体的重要性，而且突出了多种环境压力的互动影响。

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