Rapid Evolution of Host Repertoire and Geographic Range in a Young and Diverse Genus of Montane Butterflies.

IF 6.1 1区 生物学 Q1 EVOLUTIONARY BIOLOGY Systematic Biology Pub Date : 2024-11-01 DOI:10.1093/sysbio/syae061
Shifang Mo, Yaowei Zhu, Mariana P Braga, David J Lohman, Sören Nylin, Ashraf Moumou, Christopher W Wheat, Niklas Wahlberg, Min Wang, Fangzhou Ma, Peng Zhang, Houshuai Wang
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Abstract

Evolutionary changes in geographic distribution and larval host plants may promote the rapid diversification of montane insects, but this scenario has been rarely investigated. We studied rapid radiation of the butterfly genus Colias, which has diversified in mountain ecosystems in Eurasia, Africa, and the Americas. Based on a dataset of 150 nuclear protein-coding genetic loci and mitochondrial genomes, we constructed a time-calibrated phylogenetic tree of Colias species with broad taxon sampling. We then inferred their ancestral geographic ranges, historical diversification rates, and the evolution of host use. We found that the most recent common ancestor of Colias was likely geographically widespread and originated ~3.5 Ma. The group subsequently diversified in different regions across the world, often in tandem with geographic expansion events. No aspect of elevation was found to have a direct effect on diversification. The genus underwent a burst of diversification soon after the divergence of the Neotropical lineage, followed by an exponential decline in diversification rate toward the present. The ancestral host repertoire included the legume genera Astragalus and Trifolium but later expanded to include a wide range of Fabaceae genera and plants in more distantly related families, punctuated with periods of host range expansion and contraction. We suggest that the widespread distribution of the ancestor of all extant Colias lineages set the stage for diversification by isolation of populations that locally adapted to the various different environments they encountered, including different host plants. In this scenario, elevation is not the main driver but might have accelerated diversification by isolating populations.

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一个年轻而多样化的山地蝴蝶属的寄主种类和地理分布的快速进化。
地理分布和幼虫寄主植物的进化变化可能会促进山地昆虫的快速多样化,但这种情况很少被研究。我们研究了在欧亚大陆、非洲和美洲山区生态系统中实现多样化的蝶属 Colias 的快速辐射。基于 150 个核蛋白编码基因位点和线粒体基因组的数据集,我们构建了一个具有广泛类群取样的时间校准的 Colias 物种系统发生树。然后,我们推断了它们的祖先地理分布、历史分化率和宿主利用的演化。我们发现,Colias最近的共同祖先可能地理分布广泛,起源于约 3.5 Ma。该类群随后在全球不同地区进行了分化,通常与地理扩张事件同步进行。没有发现海拔高度对其多样化有直接影响。该属在新热带系分化后不久经历了一次多样化爆发,随后多样化率呈指数下降,直到现在。其祖先的寄主范围包括豆科的黄芪属和三叶草属,但后来扩展到包括广泛的豆科属和关系较远的科的植物,并伴随着寄主范围的扩张和收缩期。我们认为,所有现存科利亚斯(Colias)种系的祖先的广泛分布为种群的多样化创造了条件,这些种群通过隔离来适应它们遇到的各种不同环境,包括不同的寄主植物。在这种情况下,海拔高度并不是主要的驱动因素,但可能会通过隔离种群而加速多样化。
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来源期刊
Systematic Biology
Systematic Biology 生物-进化生物学
CiteScore
13.00
自引率
7.70%
发文量
70
审稿时长
6-12 weeks
期刊介绍: Systematic Biology is the bimonthly journal of the Society of Systematic Biologists. Papers for the journal are original contributions to the theory, principles, and methods of systematics as well as phylogeny, evolution, morphology, biogeography, paleontology, genetics, and the classification of all living things. A Points of View section offers a forum for discussion, while book reviews and announcements of general interest are also featured.
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