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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Effects of stress on sex change in Crepidula cf. marginalis (Gastropoda: Calyptraeidae)
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Effects of stress on sex change in Crepidula cf. marginalis (Gastropoda: Calyptraeidae)

机译：压力对Crepidula中性别变化的影响。唇唇（Insecta：清单）

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摘要

It is well known that interactions with conspecifics can affect the size and timing of sex change but the potential effects of other environmental influences on sex change are rarely examined. Sex allocation theory predicts that increased mortality rates should decrease the optimal size at sex change. Therefore we examined how stress (early starvation and exposure to desiccation) affects the size at sex change in Crepidula cf. marginalis a protandrous marine snail. Our results showed significant effects of early starvation on sex change: animals responded to early starvation by losing male characteristics earlier and at smaller sizes, remaining longer in the transitional phase, and becoming female at larger sizes than animals that were provided adequate food throughout. Desiccation on the other hand, decreased the size at which the female reproductive morphology was attained but no other effects were detected. The results of the desiccation treatment are consistent with theoretical predictions that higher mortality rates should decrease size at sex change. The starvation treatment seems to indicate that animals reduce the allocation to reproduction under extreme stress by entering a non-reproductive transitional stage earlier. Instead of regaining the male phase when conditions improved, they grew and rapidly completed the transition to the female phase.
机译：众所周知，与特定物种的相互作用会影响性别变化的大小和时间，但是很少研究其他环境影响对性别变化的潜在影响。性别分配理论预测，死亡率增加会降低性别变化时的最佳身材。因此，我们研究了Crepidula cf中的压力（早期饥饿和暴露于干燥状态）如何影响大小变化时的大小。边缘的前蜗牛海洋蜗牛。我们的结果显示了早期饥饿对性别变化的显着影响：动物对早期饥饿的反应是，较早失去雄性，且体型较小，在过渡期停留的时间更长，并且与提供充足食物的动物相比，雌性体型更大。另一方面，干燥减小了达到女性生殖形态的大小，但未检测到其他影响。干燥处理的结果与理论预测一致，即较高的死亡率应降低性别变化的大小。饥饿处理似乎表明动物通过更早进入非生殖过渡阶段，减少了在极端压力下生殖的分配。它们并没有在状况改善时重新获得雄性阶段，而是成长并迅速完成了向雌性阶段的过渡。

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