Sexual conflict in the wild: Elevated mating rate reduces female lifetime reproductive success
Sexual conflict in the wild: Elevated mating rate reduces female lifetime reproductive success
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DOI：
10.1086/429351
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发表时间：
2005-05-01
影响因子：
2.9
通讯作者：
Lubin, Y
中科院分区：
文献类型：
--
作者：
Maklakov, AA;Bilde, T;Lubin, Y
交配率的性别冲突在男女共同进化中起着关键作用，女性被预测会拒绝多余的交配尝试。最近的研究表明，多次交配对女性健康的直接影响还没有完全了解。性冲突研究中的一个主要问题是，在受控实验室环境下获得的数据与自然条件的关系如何。我们测试了雌性多次交配对自然种群中一雄多熟蜘蛛，Stegodyphus lineatus的繁殖成功的影响。先前的研究表明，成功进入雌性巢穴的雄性也会与她交配;因此，我们使用雄性遭遇率作为雌性交配率的代表。我们通过将雄鸟引入雌鸟巢中进一步提高了雌鸟的交配率。雌性终生生殖成功率评估为成功生殖的可能性、后代生产和幼年后代体重。交配率的增加增加了产卵的时间，减少了成功繁殖的可能性。雌性交配率对后代体重有负面影响。操纵的女性产生的后代比控制女性。所观察到的模式意味着一妻多夫制的女性的净成本，并建议自然交配率可以是次优的女性在自然条件下。
Sexual conflict over mating rate is suggested to play a pivotal role in male-female coevolution, and females are predicted to reject superfluous mating attempts. Recent work suggests that direct effects of multiple mating on female fitness are not fully understood. A major concern in studies of sexual conflict is how well the data obtained under controlled laboratory settings relate to natural conditions. We tested the effect of female multiple mating on reproductive success in a natural population of a polyandrous spider, Stegodyphus lineatus. Previous studies show that a male who succeeds in entering a female nest also mates with her; therefore, we used male encounter rate as a proxy of female mating rate. We further elevated female mating rate by introducing males into females' nests. Female lifetime reproductive success was assessed as the likelihood of successful reproduction, offspring production, and juvenile offspring body mass. Increased mating rate increased the time to oviposition and reduced the likelihood of successful reproduction. Female mating rate negatively affected offspring body mass. Manipulated females produced fewer offspring than control females. The observed patterns imply a net cost of polyandry to females and suggest that natural mating rates can be suboptimal for females under natural conditions.