Genetic history, structure and gene flow among populations of Belgica antarctica, the only free-living insect in the western Antarctic Peninsula

Genetic history, structure and gene flow among populations of Belgica antarctica, the only free-living insect in the western Antarctic Peninsula
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南极半岛西部唯一自由生活的昆虫 Belgica antarctica 种群的遗传历史、结构和基因流

DOI:
10.1016/j.polar.2023.100945
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发表时间:
2023
期刊:
影响因子:
1.8
通讯作者:
Michel, Andy
Michel, Andy
中科院分区:
地球科学4区
文献类型:
--
作者:
Edgington, Hilary;Pavinato, Vitor A.C.;Spacht, Drew;Gantz, J.D.;Convey, Peter;Lee, Richard E.;Denlinger, David L.;Michel, Andy

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气候和环境的变化会影响人口和生物多样性的可持续性。了解过去和现在的种群遗传多样性可以帮助我们更好地预测物种对未来环境变化的反应。南极洲经历了剧烈的环境变化,威胁到其生物多样性。本研究对南极半岛西部特有的无翅蠓(belgica antarctica)进行了系统地理学和种群遗传结构分析。这种昆虫具有适应极端温度、盐度、湿度、缺氧和ph的特征,南极比利时虫广泛分布在无冰栖息地的分散岛屿上,但关于其遗传历史、多样性和基因流动的问题仍然存在。我们创建了基于核的单核苷酸多态性(SNP)标记,并对来自11个种群的229个个体进行了基因分型,以检查历史和当前种群的遗传模式。我们的研究结果支持最近在过去1000万年中不同岛屿上的人口之间的分化。此外,尽管没有翅膀,B。南极洲表现出频繁的岛屿间迁徙,可能是通过洋流或南极脊椎动物(如海鸟)的传播。b .的进化史与b。南极洲和该地区的环境和生态强调了了解其种群动态对预测其在环境变化下的持久性的重要性。
Changes in climate and environment can impact the sustainability of populations and biodiversity. Understanding population genetic diversity in the past and present can help us better predict species' responses to future environmental change. Antarctica has experienced drastic environmental change which threatens its biodiversity. In this study, we characterized the phylogeography and population genetic structure ofBelgica antarctica, a wingless midge that is endemic to the western Antarctic Peninsula. This insect has adaptive features to withstand extremes in temperature, salinity, humidity, anoxia and pH.Belgica antarcticais widespread on widely dispersed islands of ice-free habitat, but questions remain regarding its genetic history, diversity and gene flow. We created nuclear-based, single nucleotide polymorphism (SNP) markers and genotyped 229 individuals from 11 populations to examine historical and current population genetic patterns. Our results support recent divergence among populations on different islands within the last 1 Mya. Furthermore, despite a lack of wings,B. antarcticaexhibited frequent migration among islands, perhaps via ocean currents or phoresy with Antarctic vertebrates (e.g.seabirds). The close link between the evolutionary history ofB. antarcticaand the region's environment and ecology emphasize the importance of understanding its population dynamics to predict its persistence under environmental change.
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