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The effects of elevated water temperature on native juvenile mussels: implications for climate change

机译：水温升高对当地贻贝的影响：对气候变化的影响

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摘要

Native freshwater mussels are a diverse but imperiled fauna and may be especially sensitive to increasing water temperatures because many species already may be living near their upper thermal limits. We tested the hypothesis that elevated water temperatures (20, 25, 30, and 35℃) adversely affected the survival and physiology of 2-mo-old juvenile mussels (Lampsilis abrupta, Lampsilis siliquoidea, and Megalonaias nervosa) in 28-d laboratory experiments. The 28-d LT50s (lethal temperature affecting 50% of the population) ranged from 25.3 to 30.3℃ across species, and were lowest for L. abrupta and L. siliquoidea. Heart rate of L. siliquoidea was not affected by temperature, but heart rate declined at higher temperatures in L. abrupta and M. nervosa. However, for both of these species, heart rate also declined steadily during the experiment and a strong temperature × time interaction was detected. Juvenile growth was low for all species in all treatments and did not respond directly to temperature, but growth of some species responded to a temperature × time interaction. Responses to thermal stress differed among species, but potential laboratory artifacts may limit applicability of these results to real-world situations. Environmentally relevant estimates of upper thermal tolerances in native mussels are urgently needed to assess the extent of assemblage changes that can be expected in response to global climate change.
机译：本地淡水贻贝是一种多样但濒临灭绝的动物，对水温升高可能特别敏感，因为许多物种可能已经生活在其高温上限附近。我们在28天的实验室实验中检验了水温升高（20、25、30和35℃）对2个月大的青口贻贝（蓝鳍金枪鱼，南美白对虾和神经Mega）的生存和生理产生不利影响的假设。 。 28 d LT50（致死温度影响50％的种群）的跨物种温度范围为25.3至30.3℃，最低的是L. abrupta和L. siliquoidea。刺槐的心率不受温度的影响，但在较高的温度下，阿布鲁普和神经支原体的心率下降。但是，对于这两个物种，在实验期间心率也稳定下降，并且检测到强烈的温度×时间相互作用。在所有处理中，所有物种的幼鱼生长均较低，并且对温度没有直接响应，但某些物种的生长对温度×时间相互作用做出了响应。物种之间对热应力的反应不同，但是潜在的实验室伪像可能会限制这些结果在现实世界中的适用性。迫切需要与环境相关的本地贻贝热耐受性的估计，以评估可预期响应全球气候变化的组合变化的程度。

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