欧亚领旅鼠的种群动态和人口历史。

Edana Lord, Aurelio Marangoni, Mateusz Baca, Danijela Popović, Anna V Goropashnaya, John R Stewart, Monika V Knul, Pierre Noiret, Mietje Germonpré, Elodie-Laure Jimenez, Natalia I Abramson, Sergey Vartanyan, Stefan Prost, Nickolay G Smirnov, Elena A Kuzmina, Remi-André Olsen, Vadim B Fedorov, Love Dalén
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引用次数: 0

摘要

背景:古DNA研究表明,晚更新世的气候变化对北极物种的种群动态有重大影响。欧亚领旅鼠(Dicrostonyx torquatus)是北极生态系统中的关键物种。先前的研究表明,过去的气候波动是该物种过去种群动态的重要驱动因素:在这里,我们分析了来自欧亚大陆的 59 个古代有丝分裂基因组和 54 个现代有丝分裂基因组,以及一个现代核基因组。我们的研究结果表明,在晚更新世早期出现了种群增长和基因多样化,这意味着领角旅鼠可能在温暖的埃米安冰期经历了基因瓶颈。此外,我们还发现了晚更新世期间多个具有时间结构的有丝分裂基因组支系,这与早先发现的冰川晚期动态种群历史相一致。最后,我们在西伯利亚东北部发现了一个种群,该种群在更新世末期保持了遗传多样性和恒定的种群数量,这表明在全新世开始后气温不断升高的时期,该地区的领旅鼠生活在适宜的条件下:本研究强调了过去的气候变暖,尤其是埃米间冰期对领旅鼠进化史的影响,以及整个晚更新世的时空种群结构。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Population dynamics and demographic history of Eurasian collared lemmings.

Population dynamics and demographic history of Eurasian collared lemmings.

Population dynamics and demographic history of Eurasian collared lemmings.

Population dynamics and demographic history of Eurasian collared lemmings.

Background: Ancient DNA studies suggest that Late Pleistocene climatic changes had a significant effect on population dynamics in Arctic species. The Eurasian collared lemming (Dicrostonyx torquatus) is a keystone species in the Arctic ecosystem. Earlier studies have indicated that past climatic fluctuations were important drivers of past population dynamics in this species.

Results: Here, we analysed 59 ancient and 54 modern mitogenomes from across Eurasia, along with one modern nuclear genome. Our results suggest population growth and genetic diversification during the early Late Pleistocene, implying that collared lemmings may have experienced a genetic bottleneck during the warm Eemian interglacial. Furthermore, we find multiple temporally structured mitogenome clades during the Late Pleistocene, consistent with earlier results suggesting a dynamic late glacial population history. Finally, we identify a population in northeastern Siberia that maintained genetic diversity and a constant population size at the end of the Pleistocene, suggesting suitable conditions for collared lemmings in this region during the increasing temperatures associated with the onset of the Holocene.

Conclusions: This study highlights an influence of past warming, in particular the Eemian interglacial, on the evolutionary history of the collared lemming, along with spatiotemporal population structuring throughout the Late Pleistocene.

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