Sexual conflict over mating in Gnatocerus cornutus? Females prefer lovers not fighters.
Sexual conflict over mating in Gnatocerus cornutus? Females prefer lovers not fighters.
复制标题
角角齿龙交配过程中的性冲突？
DOI：
10.1098/rspb.2014.0281
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
Hosken DJ
中科院分区：
文献类型：
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作者：
Okada K;Katsuki M;Shrma MD;House CM;Hosken DJ
女性择偶和男性-男性竞争是性别选择的典型机制。然而，这两种机制并不总是偏爱同样的男性。此外，最近有一点很清楚，女性的选择有时会让男性受益，从而降低女性的健康水平。因此，男性与男性之间的竞争和女性的选择是否有利于相同或不同的男性，以及女性是否受益于配偶选择，仍然是悬而未决的问题。在角甲虫Gnatocerus cornutus中，雄性用来对抗对手的下颌变大，当有直接的雄性和雄性竞争时，更大的下颌提供交配优势。然而，目前还不清楚雌性是否更喜欢这些竞争激烈的雄性。在这里，我们表明，女性的选择目标是男性的求爱，而不是下颌的大小，这两个特征没有表型或遗传相关。与迷人的、高度追求的雄性交配给雌性带来了间接的好处，但这只是通过雄性吸引力的遗传性来实现的。然而，与有魅力的雄性交配避免了与竞争激烈的雄性交配给女儿带来的间接成本。我们的结果表明，男性与男性之间的竞争可能会限制女性的配偶选择，可能会降低女性的适合度，并在交配过程中产生性冲突。
Female mate choice and male–male competition are the typical mechanisms of sexual selection. However, these two mechanisms do not always favour the same males. Furthermore, it has recently become clear that female choice can sometimes benefit males that reduce female fitness. So whether male–male competition and female choice favour the same or different males, and whether or not females benefit from mate choice, remain open questions. In the horned beetle,Gnatocerus cornutus,males have enlarged mandibles used to fight rivals, and larger mandibles provide a mating advantage when there is direct male–male competition for mates. However, it is not clear whether females prefer these highly competitive males. Here, we show that female choice targets male courtship rather than mandible size, and these two characters are not phenotypically or genetically correlated. Mating with attractive, highly courting males provided indirect benefits to females but only via the heritability of male attractiveness. However, mating with attractive males avoids the indirect costs to daughters that are generated by mating with competitive males. Our results suggest that male–male competition may constrain female mate choice, possibly reducing female fitness and generating sexual conflict over mating.