Veeries如何变化:全基因组测序解析了一种长途迁徙鸟类的遗传结构

Abigail A Kimmitt, Teresa M Pegan, Andrew W Jones, Kevin Winker, Benjamin M Winger
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摘要

在具有高扩散能力的高纬度物种(如长途迁徙鸟类)中,由于高基因流或最近的冰川后扩张,种群通常被认为几乎不表现出遗传结构。我们对一种长距离迁徙鸟类 Veery(Catharus fuscescens)的整个繁殖范围内的 120 多个低覆盖率全基因组进行了测序,发现了距离隔离的有力证据。此外,我们还发现北方、美国西部山地和阿巴拉契亚山脉南部采样区域之间的遗传结构截然不同。我们认为,这种高度迁徙物种的种群遗传结构可以通过全基因组数据提供的高分辨率检测到,因为与许多迁徙鸟类类似,Veery表现出高度的繁殖地忠诚度,这很可能限制了基因流动。在该物种鲜为人知的南美洲非繁殖地采样的个体,其在繁殖地的距离隔离分辨率足以确定其可能的繁殖起源,这表明利用基因组数据评估该物种迁徙连通性的潜力。由于Veery的繁殖地横跨北美洲历史上冰川融化和未冰川融化的地区,我们还评估了当代的结构和遗传多样性模式是否与冰川避难所的历史种群隔离一致。我们发现,遗传多样性模式并不支持南部山地地区(阿巴拉契亚山脉南部或美国西部山区)作为冰川避难所。总之,我们的研究结果表明,即使在没有明显的历史变迁或当代扩散障碍的情况下,距离隔离也会在这一高度变异物种的繁殖地产生遗传结构与地理之间的微妙联系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
How Veeries vary: Whole genome sequencing resolves genetic structure in a long-distance migratory bird
In high-latitude species with high dispersal ability, such as long-distance migratory birds, populations are often assumed to exhibit little genetic structure due to high gene flow or recent postglacial expansion. We sequenced over 120 low-coverage whole genomes from across the breeding range of a long-distance migratory bird, the Veery (Catharus fuscescens), revealing strong evidence for isolation by distance. Additionally, we found distinct genetic structure between boreal, western montane U.S., and southern Appalachian sampling regions. We suggest that population genetic structure in this highly migratory species is detectable with the high resolution afforded by whole-genomic data because, similar to many migratory birds, the Veery exhibits high breeding-site fidelity, which likely limits gene flow. Resolution of isolation by distance across the breeding range was sufficient to assign likely breeding origins of individuals sampled in this species’ poorly understood South American nonbreeding range, demonstrating the potential to assess migratory connectivity in this species using genomic data. As the Veery’s breeding range extends across both historically glaciated and unglaciated regions in North America, we also evaluated whether contemporary patterns of structure and genetic diversity are consistent with historical population isolation in glacial refugia. We found that patterns of genetic diversity did not support southern montane regions (southern Appalachians or western U.S. mountains) as glacial refugia. Overall, our findings suggest that isolation by distance yields subtle associations between genetic structure and geography across the breeding range of this highly vagile species even in the absence of obvious historical vicariance or contemporary barriers to dispersal.
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