Costly infidelity: low lifetime fitness of extra-pair offspring in a passerine bird.
Costly infidelity: low lifetime fitness of extra-pair offspring in a passerine bird.
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DOI：
10.1111/evo.12475
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发表时间：
2014-10
期刊：
影响因子：
--
通讯作者：
Nakagawa S
中科院分区：
文献类型：
--
作者：
Hsu YH;Schroeder J;Winney I;Burke T;Nakagawa S
配对外交配（EPC）在社会一夫一妻制物种中广泛存在，但其进化益处仍然存在争议。间接遗传效益假设假设，雌性参与 EPC 可以产生比配对内后代 (WPO) 更高质量的配对外后代 (EPO)。相反，性冲突假说认为 EPC 对男性有利，但对女性不利。因此，根据性冲突假说，EPO 预计并不比 WPO 更适合。我们在 12 年的数据集中测试了这两个假设，其中包含来自孤岛麻雀 (Passer Domesticus) 的完整生活史和谱系信息。我们比较了 EPO 和两种类型的 WPO 的适应度组成部分：（1）来自基因上的一妻多夫“不忠”母亲的 WPO，以及（2）来自基因上的一夫一妻制母亲的 WPO。我们发现所有三组后代的孵化和雏鸟存活概率相似。出乎意料的是，EPO 招募到繁殖种群的概率最低，终生繁殖产量也最低。我们的结果表明，EPO 产生了间接遗传成本，而不是收益，这与间接收益模型相反。重要的是，我们观察到的间接成本在当前的性冲突模型中也被低估了。我们的结果呼吁改进理论框架，通过扩展当前的性冲突模型来纳入间接成本。
Extra-pair copulation (EPC) is widespread in socially monogamous species, but its evolutionary benefits remain controversial. Indirect genetic benefit hypotheses postulate that females engage in EPC to produce higher quality extra-pair offspring (EPO) than within-pair offspring (WPO). In contrast, the sexual conflict hypothesis posits that EPC is beneficial to males but not to females. Thus, under the sexual conflict hypothesis, EPO are predicted to be no fitter than WPO. We tested these two hypotheses in a 12-year dataset with complete life-history and pedigree information from an isolated island population of house sparrows (Passer domesticus). We compared fitness components of EPO and two types of WPO: (1) WPO from genetically polyandrous “unfaithful” mothers, and (2) WPO from genetically monogamous mothers. We found that all three groups of offspring had similar probabilities of hatching and nestling survival. Unexpectedly, EPO had the lowest probability of recruiting into the breeding population and the lowest lifetime reproductive output. Our results indicate that EPO incurred indirect genetic costs, rather than benefits, which is contrary to indirect benefit models. Importantly, the indirect costs we observed are also underappreciated in current sexual conflict models. Our results call for improved theoretical frameworks that incorporate indirect costs by extending current sexual conflict models.
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