Strategic allocation of ejaculates by male Adelie penguins
Strategic allocation of ejaculates by male Adelie penguins
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DOI：
10.1098/rspb.2000.1176
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发表时间：
2000-08-07
影响因子：
4.7
通讯作者：
Davis, LS
中科院分区：
文献类型：
--
作者：
Hunter, FM;Harcourt, R;Davis, LS
精子竞争理论认为，男性应该有策略地将精子分配给那些能给他们带来尽可能少的遗传回报的女性。尽管许多种类的昆虫和鱼类的雄性被证明有策略地分配精子，但据我们所知，我们提供了第一个证据，证明鸟类也有能力分配射精。雄性阿德利企鹅（Pygoscelis adeliae）在额外的配对交配（EPCs）中比在配对交配中更容易转移精子。with研究了在精子能力有限的情况下，男性如何分配射精的问题，发现(i)与没有进行EPC尝试的男性相比，进行EPC尝试的男性在与社会伴侣交配时射精的频率更低，（ii）在导致精子转移的交配比例上，参与EPC尝试失败的男性和参与EPC成功的男性之间没有差异。这些结果表明，雄性通过不向其社会伴侣射精，在有限的精子可用性约束下实现了精子的战略分配。
Sperm competition theory suggests that males should strategically allocate sperm to those females that will bring them the Lest possible genetic returns. Although males of a number of species of insects and fishes have been shown to allocate sperm strategically, we provide, to our knowledge, the first evidence that an avian species is also capable of allocating ejaculates. Male Adelie penguins (Pygoscelis adeliae) are more likely to transfer sperm during extra-pair copulations (EPCs) than during pair copulations. with investigated the question of how males allocate ejaculates within the constraints of limited sperm ability and found (i) that males that engaged in EPC attempts ejaculated less often when copulating with their social partner than males that made no EPC attempts, and (ii) that there was no difference between males that were involved in failed EPC attempts and those that were involved in successful EPCs in the proportion of copulations that resulted in sperm transfer. These results indicate that males achieve strategic allocation of sperm within the constraints of limited sperm availability by withholding ejaculates from their social partners.