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Differential host use affects fecundity of the gastropod Crepidula onyx

机译：不同的寄主使用会影响腹足纲Crepidula玛瑙的繁殖力

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摘要

For epibiotic or symbiotic marine invertebrates, alternative host species may differ substantially in quality, and under some circumstances such differences in host quality may lead to the evolution of increased host specificity. However, the fitness consequences of alternative hosts for epibiotic or symbiotic marine invertebrates have rarely been quantified. In Southern California, the gastropod Crepidula onyx is often found as an epibiont on either bay mussels (Mytilus galloprovincialis) or cone snails (Conus californicus). These hosts differ greatly in maximum size, with possible effects on size at sex change and final size in Cr.onyx, and thus on fecundity. Further, Cr.onyx on the two hosts differ in shell shape, possibly affecting the size of the ctenidium, which Cr.onyx uses for suspension feeding. We examined these potential effects of host use on fitness components in Cr.onyx. Epibionts on mussels reached much larger average sizes than did those on cone snails; further, epibionts on mussels often completed sex change at much larger sizes than did those on cone snails. On average, mussel epibionts had threefold higher average fecundities than did cone snail epibionts. Although there was a slight difference in shell shape between epibionts on the two host species, there was no difference in the scaling of ctenidium area with body size for Cr.onyx from the two hosts. The large average differences in fecundity in epibionts associated with the two alternative hosts suggests that there may be strong selection on host choice at larval settlement.
机译：对于表生生物或共生海洋无脊椎动物，替代寄主物种的质量可能存在实质性差异，在某些情况下，寄主质量的此类差异可能会导致宿主特异性提高。但是，替代宿主对表生生物或共生海洋无脊椎动物的适应性后果很少被量化。在南加利福尼亚州，腹足纲Crepidula y玛瑙经常被发现为海湾贻贝（Mytilus galloprovincialis）或圆锥蜗牛（Conus californicus）上的表生生物。这些寄主的最大体型差异很大，可能会对性交时的体型和的最终体型产生影响，从而对生殖力产生影响。此外，两个宿主上的Cr.onyx的壳形不同，可能会影响Cr.onyx用于悬浮液进料的铈的大小。我们检查了寄主使用对Cr.onyx健身成分的这些潜在影响。贻贝上的表皮生物的平均大小比锥蜗牛上的大。此外，贻贝上的表皮动物通常能完成性改变，其大小要比锥蜗牛上的大。平均而言，蚌壳表皮动物的平均繁殖力比锥蜗牛表皮动物的平均繁殖力高三倍。尽管两种寄主物种的表皮虫的壳形略有不同，但两种寄主的Cr.onyx的ct面积与身体大小的比例没有差异。与这两个替代寄主相关的附生动物繁殖力的平均差异很大，这表明在幼体定居时寄主选择的选择可能很强。

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