北方剑尾鱼体型变小和剑饰消失的反复进化。

IF 3.1 2区 环境科学与生态学 Q2 ECOLOGY Evolution Pub Date : 2024-09-10 DOI:10.1093/evolut/qpae124
Gabriel A Preising, Theresa Gunn, John J Baczenas, Daniel L Powell, Tristram O Dodge, Sean T Sewell, Alexa Pollock, Jose Angel Machin Kairuz, Markita Savage, Yuan Lu, Meredith Fitschen-Brown, Axel Meyer, Manfred Schartl, Molly Cummings, Sunishka Thakur, Callen M Inman, Oscar Ríos-Cardenas, Molly Morris, Michael Tobler, Molly Schumer
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引用次数: 0

摘要

在整个生命树中,物种反复进化出类似的表型。在对生态特征进行深入研究的同时,也有证据表明性选择特征也在反复进化。剑尾鱼(Xiphophorus)是研究性选择的经典模式系统,雌性剑尾鱼表现出强烈的交配偏好,喜欢体型大的雄性和一系列性二态的装饰品。有趣的是,在该属中,性选择性状也曾多次消失。然而,由于该类物种之间的系统发育关系历来存在争议,部分原因是基因流的盛行,因此装饰品和大体型丢失的次数一直存在不确定性。在这里,我们利用全基因组测序方法重新研究了Xiphophorus支系内的系统发育关系,该支系在有无性选择性状方面存在差异。利用野生捕获的个体,我们确定了一个小型、无装饰的物种 X. continens 的系统发育位置,确认了该支系中装饰和大体型的额外丧失。有了这些修正后的系统发生关系,我们利用系统发生比较方法分析了体型与其他性选择性状之间共同进化的证据。这些结果为我们提供了洞察力,使我们了解到驱动性选择性状成套性状反复丧失的进化压力。
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Recurrent evolution of small body size and loss of the sword ornament in Northern swordtail fish.

Across the tree of life, species have repeatedly evolved similar phenotypes. While well-studied for ecological traits, there is also evidence for recurrent evolution of sexually selected traits. Swordtail fish (Xiphophorus) are a classic model system for studying sexual selection, and female Xiphophorus exhibit strong mate preferences for large male body size and a range of sexually dimorphic ornaments. Interestingly, sexually selected traits have also been lost multiple times in the genus. However, there has been uncertainty over the number of losses of ornamentation and large body size because phylogenetic relationships between species in this group have historically been controversial, partially due to prevalent gene flow. Here, we use whole-genome sequencing approaches to re-examine phylogenetic relationships within a Xiphophorus clade that varies in the presence and absence of sexually selected traits. Using wild-caught individuals, we determine the phylogenetic placement of a small, unornamented species, X. continens, confirming an additional loss of ornamentation and large body size in the clade. With these revised phylogenetic relationships, we analyze evidence for coevolution between body size and other sexually selected traits using phylogenetic comparative methods. These results provide insights into the evolutionary pressures driving the recurrent loss of suites of sexually selected traits.

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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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