Reinterpreting Bateman gradients: multiple mating and selection in both sexes of a songbird species
Reinterpreting Bateman gradients: multiple mating and selection in both sexes of a songbird species
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DOI：
10.1093/beheco/ars077
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发表时间：
2012-09-01
影响因子：
2.4
通讯作者：
Ketterson, E. D.
中科院分区：
文献类型：
--
作者：
Gerlach, N. M.;McGlothlin, J. W.;Ketterson, E. D.
贝特曼原则，即男性生殖成功率应该随着多次交配而增加，而女性生殖成功率不应该，长期以来一直被用来解释行为的性别差异。交配成功和繁殖成功之间的统计关系，或贝特曼梯度，已被提出作为一种量化性选择中性别差异的方法。我们使用了一个长期的数据集在社会一夫一妻制的黑眼睛junco的父权分布，以检查一生的生殖成功的多次交配的影响，并确定内对和外对交配的相对贡献。两性都表现出很强的积极贝特曼梯度，即使当繁殖年数占。虽然理论表明，这种模式表明，在两性的性选择的强大潜力，我们认为，强大的贝特曼梯度的解释，特别是在女性，有许多潜在的并发症。我们讨论了几种不同的解释，我们的研究结果，其中没有一个需要性选择作用于女性特征，包括针对固有的多产女性的男性寻求额外的配对配偶和增加的权力，以检测额外的对后代家庭规模的增加。因为这两种解释都不需要增加交配成功率导致增加生殖成功率，我们得出结论，使用贝特曼梯度来衡量性选择的潜力可能会误导一些交配系统和生活史，如在容科斯中发现的iteroparous社会一夫一妻制。
Bateman's principle, which states that male reproductive success should increase with multiple mating, whereas female reproductive success should not, has long been used to explain sex differences in behavior. The statistical relationship between mating success and reproductive success, or Bateman gradient, has been proposed as a way to quantify sex differences in sexual selection. We used a long-term data set on the distribution of paternity in the socially monogamous dark-eyed junco to examine the effect of multiple mating on lifetime reproductive success and to determine the relative contributions of within-pair and extra-pair mating. Both sexes exhibited a strong positive Bateman gradient, even when the number of breeding years was accounted for. Although theory suggests that this pattern indicates a strong potential for sexual selection in both sexes, we argue that the interpretation of strong Bateman gradients, particularly in females, has many potential complications. We discuss several alternative explanations for our results, none of which requires sexual selection acting on female traits, including targeting of inherently fecund females by males seeking extra-pair mates and increased power to detect extra-pair offspring as family size increases. Because neither of these explanations requires that increased mating success causes increased reproductive success, we conclude that using Bateman gradients to measure the potential for sexual selection may be misleading for some mating systems and life histories, such as the iteroparous social monogamy found in juncos.