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首页> 外文期刊>Marine ecology progress series >Thermal tolerance of Crepidula fornicata (Gastropoda) life history stages from intertidal and subtidal subpopulations
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Thermal tolerance of Crepidula fornicata (Gastropoda) life history stages from intertidal and subtidal subpopulations

机译：潮间皮下和潮间亚群的灰Cre生活史阶段的热耐受性

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ABSTRACT: The ability to withstand high summer temperatures is an extremely important determinant of species distributions in the intertidal zone; most marine organisms cannot live intertidally because of the harsh conditions experienced during aerial emersion. The members of some species, though, live both intertidally and subtidally, and their physiological tolerance to stressors may differ depending on their genetic connectivity, acclimatization, and differential postsettlement mortality. Furthermore, tolerances of organisms at different life-history stages within both habitats may differ and will play an important role in determining adult distributions. To determine the effect of habitat and life-history stage on physiological tolerance and the likely contribution of upper thermal tolerance limits to the native distribution of an important invasive species, the slippershell snail Crepidula fornicata, we compared the thermal tolerance of intertidal and subtidal embryos and adults in relation to conditions that they experience in the field. We found C. fornicata living both intertidally and subtidally in Bissel Cove, Rhode Island, where they experienced drastically different thermal conditions. Intertidal individuals achieved body temperatures as high as 42°C, more than 15°C higher than those recorded in subtidal conspecifics. However, subtidal individuals had remarkably high thermal tolerances that were nearly identical to those of intertidal conspecifics (lethal range = 33-37°C following a 3 h exposure). Furthermore, embryos were even more tolerant to high thermal stress than adults. These results are surprising: the few previous studies that have compared thermal tolerances among individuals at different life-history stages have found differences among them, and early stages are generally more sensitive than adults. Interestingly, the markedly higher temperatures that intertidal animals experienced in this study had little effect on their thermal tolerance. Intertidal (but not subtidal) slippershell snails are now living dangerously close to their upper thermal limits and will almost certainly be relegated to the subtidal as global temperatures rise.
机译：摘要：承受夏季高温的能力是潮间带物种分布的极为重要的决定因素。由于空中突袭过程中遇到的严酷条件，大多数海洋生物无法间断地生活。但是，某些物种的成员既生活在杂种间，又生活在地下，它们对应激源的生理耐受性可能会有所不同，这取决于它们的遗传连通性，适应程度和后期沉降死亡率。此外，两个生境在不同的生活史阶段对生物的耐受性可能不同，并将在确定成虫的分布中发挥重要作用。为了确定栖息地和生活史阶段对生理耐受性的影响以及热耐受上限对重要入侵物种（i.Crepidula fornicata ）的分布性的可能贡献，我们比较了热耐受性潮间带和潮间带胚胎及成虫对它们在野外所处条件的耐受性。我们找到了 C。 fornicata 在罗得岛的比塞尔湾（Bissel Cove）间生活，生活在两个地方，那里经历了截然不同的热环境。潮间带个体的体温高达42°C，比潮间带同种体中记录的体温高15°C以上。然而，潮下个体具有非常高的热耐受性，几乎与潮间同种的热耐受性相同（暴露3 h后致死范围= 33-37°C）。此外，与成人相比，胚胎对高热应激的耐受性更高。这些结果令人惊讶：以前的一些研究比较了不同生活史阶段个体的热耐受性，发现它们之间存在差异，并且早期阶段通常比成年人敏感。有趣的是，潮间动物在这项研究中所经历的明显较高的温度对其热耐受性几乎没有影响。潮间带（但非潮间带）的滑壳蜗牛现在危险地生活在接近其热量上限的高度，几乎可以肯定的是，随着全球温度的升高，蜗牛将沦为潮下带。

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