五种通道形目植物在不同环境梯度下的遗传多样性分布模式

IF 1.7 2区 生物学 Q1 ORNITHOLOGY
Marcela Restrepo-Arias , Héctor F. Rivera-Gutiérrez , Iván Darío Soto-Calderón , Ernesto Pérez-Collazos , Catalina González-Quevedo
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引用次数: 0

摘要

了解影响自然种群遗传多样性分布的进化过程是进化生物学的一个关键问题。物种的分布范围和环境梯度都可以通过基因流动、选择和遗传漂变等机制影响这种多样性。为了探索这些力量是如何相互作用的,我们评估了三种广泛分布和两种狭窄分布的鸟类的中性和适应性遗传变异,这些鸟类共同分布在哥伦比亚安蒂奥基亚的考卡河峡谷,这是一个明显的环境异质性地区。我们在峡谷梯度的8个地点对个体进行了采样,并使用微卫星和toll样受体(TLRs)分析了遗传多样性和结构,TLRs是一个参与先天免疫的基因家族。与分布较窄的物种相比,分布较广的物种在两种标记类型上均表现出较高的遗传多样性。微卫星杂合度与TLR杂合度之间的关系虽不显著,但分布较广的物种呈负相关,分布较窄的物种呈正相关。这一结果表明,遗传漂变对分布狭窄的物种的影响更大。我们的研究结果强调了分布范围在维持遗传多样性中的作用,并表明环境梯度通过与基因流动和选择的相互作用,可能影响适应性变异的模式。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Patterns of genetic diversity in five species of Passeriformes co-distributed in an environmental gradient
Understanding the evolutionary processes that influence the distribution of genetic diversity in natural populations is a key issue in evolutionary biology. Both species' distribution ranges and environmental gradients can influence this diversity through mechanisms such as gene flow, selection, and genetic drift. To explore how these forces interact, we assessed neutral and adaptive genetic variation in three widely distributed and two narrowly distributed bird species co-occurring along the Cauca River canyon in Antioquia, Colombia—a region of pronounced environmental heterogeneity. We sampled individuals across eight sites spanning the canyon's gradient and analyzed genetic diversity and structure using microsatellites and toll-like receptors (TLRs), a gene family involved in innate immunity. Widely distributed species consistently exhibited higher genetic diversity at both marker types compared to their narrowly distributed counterparts. Although we did not find a significant relationship between microsatellite heterozygosity and TLR heterozygosity, we evidenced a negative trend for widely distributed species and a positive trend for narrowly distributed species. This result suggests that there is a stronger effect of genetic drift in narrowly distributed species. Our results highlight the role of distribution range in maintaining genetic diversity and suggest that environmental gradients, by interacting with gene flow and selection, may influence patterns of adaptive variation.
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来源期刊
Avian Research
Avian Research ORNITHOLOGY-
CiteScore
2.90
自引率
16.70%
发文量
456
审稿时长
46 days
期刊介绍: Avian Research is an open access, peer-reviewed journal publishing high quality research and review articles on all aspects of ornithology from all over the world. It aims to report the latest and most significant progress in ornithology and to encourage exchange of ideas among international ornithologists. As an open access journal, Avian Research provides a unique opportunity to publish high quality contents that will be internationally accessible to any reader at no cost.
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