HOMAGE TO BATEMAN: SEX ROLES PREDICT SEX DIFFERENCES IN SEXUAL SELECTION
HOMAGE TO BATEMAN: SEX ROLES PREDICT SEX DIFFERENCES IN SEXUAL SELECTION
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DOI：
10.1111/evo.12086
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发表时间：
2013-07-01
期刊：
影响因子：
3.3
通讯作者：
Arnqvist, Goran
中科院分区：
文献类型：
--
作者：
Fritzsche, Karoline;Arnqvist, Goran
经典的性别角色理论预测，在表现常规性别角色的分类群中，雄性的性别选择应该更强，而在角色颠倒的交配系统中，雌性的性别选择应该更强。为了验证这一非常重要的预测，并评估性选择的不同衡量标准的有效性，我们使用一种新的实验设计，在四种性别角色不同的种子甲虫物种中估计了两性的性选择。我们发现，性别选择在雌性中是相当大的，在角色颠倒的物种中，雌性和雄性的性选择强度是相似的。总体而言，男性的性选择明显强于女性，剩余选择构成了两性净选择的重要组成部分。此外，与具有常规性别角色的物种相比，角色颠倒物种的雌性性别选择更强。与基于特征的度量(选择差异)相比，基于方差的性选择度量(贝特曼梯度和选择机会)更好地预测了不同物种生殖行为和形态中的性别二形性。我们的结果强调了使用结合交配后表现出的健康成分的分析的重要性。我们认为，贝特曼梯度通常是性别和/或物种比较中性选择强度的最具信息量的衡量标准。
Classic sex role theory predicts that sexual selection should be stronger in males in taxa showing conventional sex roles and stronger in females in role reversed mating systems. To test this very central prediction and to assess the utility of different measures of sexual selection, we estimated sexual selection in both sexes in four seed beetle species with divergent sex roles using a novel experimental design. We found that sexual selection was sizeable in females and the strength of sexual selection was similar in females and males in role-reversed species. Sexual selection was overall significantly stronger in males than in females and residual selection formed a substantial component of net selection in both sexes. Furthermore, sexual selection in females was stronger in role-reversed species compared to species with conventional sex roles. Variance-based measures of sexual selection (the Bateman gradient and selection opportunities) were better predictors of sexual dimorphism in reproductive behavior and morphology across species compared to trait-based measures (selection differentials). Our results highlight the importance of using assays that incorporate components of fitness manifested after mating. We suggest that the Bateman gradient is generally the most informative measure of the strength of sexual selection in comparisons across sexes and/or species.