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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >The effects of limpet morphology on predation by adult cancrid crabs
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The effects of limpet morphology on predation by adult cancrid crabs

机译：贝壳形态对成年蟹捕食的影响。

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摘要

Limpets are important prey for some crab species, yet little is known about the role of the limpet shell in defense against crab predation. In an effort to identify limpet shell morphologies that decrease vulnerability to predation by adult cancrid crabs, laboratory feeding trials using three common species of Pacific Northwest limpets (Lottia digitalis, L. pelta and L. scutum) were conducted to assess how different shell morphologies affect mortality and handling time. Large size, shell ornament (radial ridges), and low-spired geometry were expected to result in increased survivorship, and/or longer handling times. Although mortality varied between species, no relationship between size and increased survivorship was observed. Contrary to the expectation that radial ribs resist predation, individuals with smooth morphologies experienced lower mortality. Furthermore, binomial logistic regression indicated that the presence of shell ornament was the only significant explanatory variable in predicting mortality. As species possessing high-spires and ridges may typically occur high in the intertidal where predation risk due to crabs is relatively lower, shell ornament is likely an adaptation to physical factors such as thermal stress, and does not appear to be antipredatory for limpets.
机译：帽贝是某些螃蟹物种的重要猎物，但对于帽贝在防御蟹类捕食中的作用知之甚少。为了确定可降低成年螃蟹捕食脆弱性的帽贝形态，进行了使用三种西北太平洋帽贝常见物种（Lottia digitalis，L。pelta和L. scutum）的实验室饲养试验，以评估不同的壳形态如何影响死亡率和处理时间。大型，贝壳饰物（径向脊）和低矮的几何形状预计会导致生存率提高和/或处理时间更长。尽管死亡率因物种而异，但未观察到大小与存活率增加之间的关系。与radial骨抵抗捕食的预期相反，形态光滑的个体死亡率较低。此外，二项式逻辑回归表明，贝壳装饰物的存在是预测死亡率的唯一重要解释变量。由于具有高尖顶和山脊的物种通常可能在潮间带高发，而在潮间带，由于螃蟹引起的捕食风险相对较低，因此，贝壳装饰可能是对诸如热应力之类的物理因素的适应，并且似乎对帽贝并不具有掠食性。

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