Syntopy promotes song divergence in a Neotropical avian radiation.

IF 3.1 2区 环境科学与生态学 Q2 ECOLOGY
Evolution Pub Date : 2025-02-13 DOI:10.1093/evolut/qpaf027
Vicente García-Navas, Alba Martín Del Campo, Marta Rodríguez-Rey, Paola Laiolo
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引用次数: 0

Abstract

Theory predicts that selection against maladaptive hybridization leads to divergence of sexual characters in co-occurring closely related species. Consequently, signal disparity should be greater between sympatric versus allopatric lineage pairs. However, this pattern may also result from species sorting or the greater evolutionary age of sympatric pairs. We used species pairs comparisons to examine the existence of acoustic divergence in a Neotropical montane radiation, the Rhinocryptidae, whose members tend to occupy different elevational ranges. Most rhinocryptids exhibit conservative morphology and are only differentiated by song attributes. Our results show that sympatric species pairs that overlap in elevation exhibited overall greater song divergence compared to allopatric species pairs after controlling for morphological differences, age and phylogenetic effects. Song divergence decreased when excluding sympatric pairs that do not overlap in elevation, suggesting that selection for improved species identification between co-occurring (syntopic) species accentuates signal differentiation. Comparative evolutionary models of signal differentiation over time revealed a similar pattern which suggests that sexual selection in syntopy might have driven reproductive character displacement in this radiation. We conclude that selection against the production of unfit hybrids could favor acoustic traits that reliably signal species identity in tropical environments where many taxa are poorly differentiated by visual attributes.

新热带鸟类辐射的环境特征促进了鸣声的分化。
理论预测,对抗不适应杂交的选择导致在共生的密切相关物种中出现性性状的分化。因此,同域谱系对与异域谱系对之间的信号差异应该更大。然而,这种模式也可能是由于物种分类或更大的进化年龄的同域配对。我们用物种对比较的方法来研究新热带山地辐射中声散度的存在,Rhinocryptidae的成员往往占据不同的海拔范围。大多数鼻瓢虫表现出保守的形态,仅通过鸣叫属性来区分。研究结果表明,在控制了形态差异、年龄和系统发育影响后,海拔重叠的同域物种对的鸣声差异总体上大于异域物种对。当排除海拔不重叠的同域物种对时,鸣声差异减少,这表明共同发生的物种(同属)之间的物种识别选择加强了信号分化。随着时间的推移,信号分化的比较进化模型揭示了类似的模式,这表明在这种辐射中,同质性选择可能驱动了生殖特征的位移。我们得出的结论是,在热带环境中,许多分类群在视觉属性上差异不大的情况下,选择不适合杂交的物种可能更倾向于声学特征,这些声学特征可靠地标志着物种的身份。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Evolution
Evolution 环境科学-进化生物学
CiteScore
5.00
自引率
9.10%
发文量
0
审稿时长
3-6 weeks
期刊介绍: Evolution, published for the Society for the Study of Evolution, is the premier publication devoted to the study of organic evolution and the integration of the various fields of science concerned with evolution. The journal presents significant and original results that extend our understanding of evolutionary phenomena and processes.
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