Promiscuous mating produces offspring with higher lifetime fitness
Promiscuous mating produces offspring with higher lifetime fitness
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DOI：
10.1098/rspb.2011.1547
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发表时间：
2012-03-07
影响因子：
4.7
通讯作者：
Ketterson, Ellen D.
中科院分区：
文献类型：
--
作者：
Gerlach, Nicole M.;McGlothlin, Joel W.;Ketterson, Ellen D.
在许多物种中，每只雌性与一只雄性配对以养育后代，但也可能进行额外的配对交配。尽管这种滥交很普遍，但多次交配是否以及如何使雌性受益仍然是一个悬而未决的问题。多交配通常被认为主要是通过间接利益（即对后代适应性的遗传效应）而受到青睐。这一预测已经在各种物种中反复验证，但证据一直模棱两可，也许是因为这些研究集中在繁殖前的生存，而不是后代的终身健康。在这里，我们表明，在一个鸣禽，黑眼睛junco（Junco hyemalis），男性和女性的后代产生的额外对受精有更高的终身生殖成功比社会对内的后代。此外，成年男性后代通过额外配对交配更有可能产生额外配对后代（EPO）本身，这表明健身的好处，男性主要是通过增强交配成功。相比之下，女性EPO主要通过增强生殖力受益。我们的研究结果提供了强有力的支持的假设，即进化的额外对交配的女性是有利于间接的好处，并表明，这种好处产生的后代的生活比以前记录的晚得多。
In many species, each female pairs with a single male for the purpose of rearing offspring, but may also engage in extra-pair copulations. Despite the prevalence of such promiscuity, whether and how multiple mating benefits females remains an open question. Multiple mating is typically thought to be favoured primarily through indirect benefits (i.e. heritable effects on the fitness of offspring). This prediction has been repeatedly tested in a variety of species, but the evidence has been equivocal, perhaps because such studies have focused on pre-reproductive survival rather than lifetime fitness of offspring. Here, we show that in a songbird, the dark-eyed junco (Junco hyemalis), both male and female offspring produced by extra-pair fertilizations have higher lifetime reproductive success than do offspring sired within the social pair. Furthermore, adult male offspring sired via extra-pair matings are more likely to sire extrapair offspring (EPO) themselves, suggesting that fitness benefits to males accrue primarily through enhanced mating success. By contrast, female EPO benefited primarily through enhanced fecundity. Our results provide strong support for the hypothesis that the evolution of extra-pair mating by females is favoured by indirect benefits and shows that such benefits accrue much later in the offspring's life than previously documented.