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首页> 外文期刊>Aquatic Biology >Plausible causes for sperm-store variations in the coconut crab Birgus latro under large male-selective harvesting
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Plausible causes for sperm-store variations in the coconut crab Birgus latro under large male-selective harvesting

机译：雄性选择性收获下椰子蟹Birgus latro精子储存变化的可能原因

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摘要

In populations subjected to size-selective harvesting of large males, remaining males are small and participate in more matings than in pristine populations. The reproductive rate of such harvested populations can be restricted due to sperm limitation, because the numbers of sperm passed to females decrease with decreasing male size and increasing male mating frequency. Japanese populations of the coconut crab Birgus latro are typical examples of populations that are subject to selective harvesting of large males. Reproductive output of the population may have declined via sperm limitation. However, there is no evidence that males exhaust sperm reserves through successive matings, and little is known about the factors causing variations in the number of sperm retained by females in the harvested population. Using field investigations and laboratory experiments, I examined (1) whether males exhaust sperm reserves and (2) what factors cause variations in the number of sperm retained by females. Abouthalf of the males had exhausted sperm reserves by the end of the mating season. These males were found to be incapable of further mating or of ejaculating larger numbers of sperm, which was inferred from laboratory experiments. The size of individuals of both sexes participating in mating decreased as the mating season progressed, and males did not adjust ejaculate size in response to female size. Thus, variations in the number of sperm retained by females may have mainly been due to a decline in the male ability to ejaculate large numbers of sperm, due both to increased male mating frequency and decreased male size.
机译：在大型雄鼠进行大小选择收获的种群中，剩余的雄鼠很小，并且比原始种群参与更多的交配。由于精子的限制，可以限制此类收获种群的繁殖率，因为传递给雌性的精子数量会随着雄性大小的减少和雄性交配频率的增加而减少。日本的椰子蟹Birgus latro种群是有选择地收获大雄性种群的典型例子。人口的生殖产量可能由于精子限制而下降。但是，没有证据表明雄性会通过连续交配而耗尽精子储备，而且对导致收获种群中雌性保留的精子数量变化的因素知之甚少。通过现场调查和实验室实验，我检查了（1）男性是否耗尽了精子储备;（2）哪些因素导致女性保留的精子数量发生变化。到交配季节结束时，大约一半的雄性已经耗尽了精子储备。这些雄性被发现无法进一步交配或射出大量精子，这是根据实验室实验得出的。随着交配季节的进行，参与交配的男女个体的大小都减小了，而雄性并没有根据雌性的大小来调整射精的大小。因此，雌性保留的精子数量的变化可能主要是由于雄性交配频率增加和雄性大小减小导致雄性射出大量精子的能力下降。

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