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首页> 外文期刊>Nature >Male mammals respond to a risk of sperm competition conveyed by odours of conspecific males
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Male mammals respond to a risk of sperm competition conveyed by odours of conspecific males

机译：雄性哺乳动物应对同种雄性气味传递的精子竞争风险

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摘要

Sperm competition occurs when a female copulates with two or more males and the sperm of those males compete within the female's reproductive tract to fertilize her eggs(1,2). The frequent occurrence of sperm competition has forced males of many species to develop different strategies to overcome the sperm of competing males(1,3). A prevalent strategy is for males to increase their sperm investment ( total number of sperm allocated by a male to a particular female) after detecting a risk of sperm competition(1,3,4). It has been shown that the proportion of sperm that one male contributes to the sperm pool of a female is correlated with the proportion of offspring sired by that male(5,6). Therefore, by increasing his sperm investment a male may bias a potential spermcompetition in his favour(5,7,8). Here we show that male meadow voles, Microtus pennsylvanicus, increase their sperm investment when they mate in the presence of another male's odours. Such an increase in sperm investment does not occur by augmenting the frequency of ejaculations, but by increasing the amount of sperm in a similar number of ejaculations.
机译：当雌性与两个或多个雄性交配时，就会发生精子竞争，这些雄性的精子在雌性生殖道中竞争以使卵受精（1,2）。精子竞争的频繁发生迫使许多物种的雄性采取不同的策略来克服雄性竞争的精子（1,3）。普遍的策略是，在男性发现精子竞争风险后，增加其精子投资（男性分配给特定女性的精子总数）（1、3、4）。已有研究表明，一个雄性对一个雌性的精子池贡献的精子比例与该雄性所生后代的比例有关（5,6）。因此，通过增加精子投资，男性可能会偏向潜在的精子竞争（5,7,8）。在这里，我们显示雄性草地田鼠田鼠（Microtus pennsylvanicus）在存在另一种雄性气味的情况下交配时会增加其精子投资。精子投资的这种增加不是通过增加射精的频率而发生的，而是通过在类似数量的射精中增加精子的量来实现的。

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