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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Survival and behavioral responses of juvenile crabs of Cancer edwardsii to severe hyposalinity events triggered by increased runoff at an estuarine nursery ground
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Survival and behavioral responses of juvenile crabs of Cancer edwardsii to severe hyposalinity events triggered by increased runoff at an estuarine nursery ground

机译：爱德华氏蟹幼蟹对河口苗圃径流增加引发的严重低盐度事件的生存和行为反应

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摘要

Estuaries represent highly dynamic environments, especially with respect to salinity. Exploitation of these habitats by marine species can assist their ecological success, however they require specialized behavioral strategies as well as physiological abilities to cope with the fluctuations of physical stressors. The Valdivia River estuary, southern Chile, is a site of high larval recruitment and juvenile abundance of the commercial crab species Cancer edwardsii, particularly during the spring and summer months. This estuary experiences severe low salinity events (<7.5) for periods exceeding 6 h, that are associated with rainfall events and the subsequent higher flow rates of the tributaries. To determine the strategies employed by juvenile crabs living in the inner portions of the estuary in the face of changes in salinity conditions, we evaluated their survival and behavioral responses when exposed to a salinity gradient. Early juveniles were incubated at salinities of 0, 7.5,15-22.5, 32 and crab mortality was recorded after 1, 6 and 12 h of exposure. In addition, early juveniles were experimentally exposed to continuous and gradual changes in saline conditions to evaluate their behavior, which was recorded on video. The main results were (1) despite most Cancer species being considered weak osmoregulators, 30% of individuals of C. edwardsii were able to survive freshwater conditions for 12 h. (2) burying and not quiescence behavior was associated with a drop in salinity, (3) in severe hyposaline conditions, the crabs increased their survival burying in the substrate, probably using higher salinity (>22) interstitial water. Our findings suggest that burying behavior plays a key role in allowing the crabs inhabit inner estuarine areas where sudden and unexpected severe hyposalinity events occur.
机译：河口代表着高度动态的环境，特别是在盐度方面。海洋物种对这些生境的开发可以帮助其取得生态上的成功，但是，它们需要专门的行为策略以及生理能力来应对物理应激源的波动。智利南部的瓦尔迪维亚河河口是一个招募幼蟹和幼蟹的地方，商品蟹物种爱德华兹蟹数量很高，尤其是在春季和夏季。在超过6小时的时间里，该河口经历了严重的低盐度事件（<7.5），这与降雨事件和随后支流较高的流量有关。为了确定面对盐度条件变化而生活在河口内部的幼蟹所采取的策略，我们评估了它们在盐度梯度下的存活和行为反应。将幼鱼在0、7.5、15-22.5、32的盐度下孵育，并在暴露1、6和12小时后记录蟹的死亡率。此外，还对少年进行了生理盐水连续不断的变化实验，以评估其行为，并将其记录在视频中。主要结果是（1）尽管大多数癌症物种被认为是弱渗透调节剂，但爱德华梭菌的30％个体能够在淡水条件下生存12小时。 （2）埋藏而不是静止行为与盐度下降有关。（3）在严重的次盐水条件下，螃蟹的生存埋藏增加了，可能是使用较高盐度（> 22）的间隙水。我们的研究结果表明，掩埋行为在允许螃蟹栖息在河口内区域中起着关键作用，在河口内区域会发生突然和意外的严重低盐度事件。

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