Sexually Selected Traits Predict Patterns of Species Richness in a Diverse Clade of Suboscine Birds
Sexually Selected Traits Predict Patterns of Species Richness in a Diverse Clade of Suboscine Birds
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DOI：
10.1086/587071
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发表时间：
2008-03
期刊：
影响因子：
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通讯作者：
N. Seddon;R. Merrill;J. Tobias
中科院分区：
文献类型：
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作者：
N. Seddon;R. Merrill;J. Tobias
性选择是否起到“物种形成引擎”的作用是有争议的。一些研究表明，它促进了生殖隔离的进化，而另一些研究发现，性选择和物种丰富度之间没有关系。然而，以前的模型的解释能力可能受到限制，因为它们使用了粗略的家庭间比较，并使用交配系统和形态线索作为性别选择的替代品。在鸟类中，一个明显缺失的预测因素是歌声，这是一种性别选择的特征，在配偶选择和生殖隔离中发挥作用。我们研究了羽毛二色性和鸣声结构在多大程度上预测物种丰富度的程度，在不同的新热带亚热带鸟类家族中。这些分析揭示了性选择的强度与多样性之间的正相关关系：二色性水平较高的属，以及音调较低、更复杂的歌曲包含的物种数量更多。这种关系在控制系统发育时存在，并因亚种的纳入而得到加强，这表明性别选择在蚂鸟的多样性中发挥了作用。这是第一次揭示歌曲结构和物种多样性之间的相关性的研究，强调了声音信号和家庭内部分析在性别选择比较研究中的重要性。
Whether sexual selection acts as an “engine of speciation” is controversial. Some studies suggest that it promotes the evolution of reproductive isolation, while others find no relationship between sexual selection and species richness. However, the explanatory power of previous models may have been constrained because they employed coarse‐scale, between‐family comparisons and used mating systems and morphological cues as surrogates for sexual selection. In birds, an obvious missing predictor is song, a sexually selected trait that functions in mate choice and reproductive isolation. We investigated the extent to which plumage dichromatism and song structure predicted species richness in a diverse family of Neotropical suboscine birds, the antbirds (Thamnophilidae). These analyses revealed a positive relationship between the intensity of sexual selection and diversity: genera with higher levels of dichromatism and lower‐pitched, more complex songs contained greater numbers of species. This relationship held when controlling for phylogeny and was strengthened by the inclusion of subspecies, suggesting that sexual selection has played a role in the diversification of antbirds. This is the first study to reveal correlations between song structure and species diversity, emphasizing the importance of acoustic signals, and within‐family analyses, in comparative studies of sexual selection.