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首页> 外文期刊>Behavioral Ecology and Sociobiology >Sex allocation and paternity in a cooperatively breeding passerine: evidence for the male attractiveness hypothesis?
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Sex allocation and paternity in a cooperatively breeding passerine: evidence for the male attractiveness hypothesis?

机译：在合作繁殖的雀形目中的性别分配和亲子关系：雄性吸引力假说的证据吗？

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Sex allocation theory predicts that female birds with high-quality mates will benefit from producing more sons, since sons will inherit their father’s superior traits and enjoy a great reproductive success, whereas females with low-quality mates will benefit from producing more daughters, since the variance in reproductive success among daughters is typically lower. The male attractiveness hypothesis may apply to extra-pair paternity (EPP) because socially monogamous females routinely mate with higher quality males outside the pair bond. We test these predictions using the Tibetan ground tit (Pseudopodoces humilis), a sexually monomorphic, socially monogamous, facultatively cooperative breeder. There was greater variation in actual reproductive success among males than females due to EPP. An excess of sons was detected for bi-parental (i.e., non-cooperative) broods wherein EPP was mainly sired by bi-parental males. The pattern was attributed to male-biased sex ratios produced for both EPP and within-pair offspring within the same broods. The reason for the latter case might be a random allocation of more offspring to sons by the potentially EPP-exposed females that have an inability to control fertilization by specific males. In cooperative broods where EPP mostly resulted from within-group helpers of presumed low-quality, as indicated by their failure in acquiring a social mate, there was a non-significant tendency for EPP offspring to be daughters and for within-pair offspring in the same broods to be unbiased. These results support the EPP-related male attractiveness hypothesis especially in terms of the overproduction of sons. Offspring produced through quasi-parasitism was unbiased towards either sex, suggesting a weak female choiceness with respect to the quality of host males.
机译：性别分配理论预测，拥有高配偶的雌鸟将受益于繁殖更多的儿子，因为儿子将继承父亲的优良特质并享有巨大的繁殖成功，而拥有低配偶的雌鸟将从繁殖更多的女儿中受益。女儿之间生殖成功的差异通常较小。男性吸引力假设可能适用于双亲陪伴（EPP），因为一夫一妻制的女性通常会在双性恋之外与更高质量的男性交配。我们使用藏地山雀（Pseudopodoces humilis）（一种性态单性，社会一夫一妻制，兼职合作饲养员）测试了这些预测。由于EPP，男性实际生殖成功的差异大于女性。在双亲（即非合作）育儿中发现了过多的儿子，其中EPP主要由双亲雄性繁殖。这种模式归因于在同一群体内为EPP和配对内后代产生的男性偏向性别比。后一种情况的原因可能是由于暴露于EPP的潜在雌性动物随机分配更多的后代给儿子，这些雌性无法控制特定雄性的受精。在合作伙伴群体中，EPP主要由假定的低质量的小组内帮手造成，如未能获得社交伴侣所表明的那样，EPP的后代成为女儿和成对对后代的趋势不明显。同样的想法是公正的。这些结果支持了与EPP有关的男性吸引力假设，尤其是在儿子生产过剩方面。通过准寄生性繁殖产生的后代在任何性别上均无偏见，表明在寄主雄性的质量上雌性选择能力较弱。

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