Barriers to gene flow in the deepest ocean ecosystems: Evidence from global population genomics of a cosmopolitan amphipod.
Barriers to gene flow in the deepest ocean ecosystems: Evidence from global population genomics of a cosmopolitan amphipod.
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DOI：
10.1126/sciadv.abo6672
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发表时间：
2022-10-28
期刊：
影响因子：
13.6
通讯作者：
中科院分区：
文献类型：
--
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最深的海洋生态系统，哈达尔地带，拥有由于地理隔离和环境选择压力而产生的特有生物多样性。然而，一些动物的泛海洋分布对哈达尔地带是一系列孤立的岛状栖息地的概念提出了挑战。这在种群基因组水平上是否仍然成立还有待检验。我们调查了横跨太平洋、大西洋、印度洋和南大洋的12个哈达尔特征的双足类Bathycalisoma schellenbergi的系统地理模式，并分析了全基因组的单核苷酸多态标记和两个线粒体区域。尽管种群分布在世界各地，但种群高度局限于个体特征，只有有限的基因在地形相连的特征之间流动。这种连接的缺乏表明，种群处于不同的进化轨迹上，有证据表明阿塔卡马海沟存在潜在的神秘物种形成。总而言之，这项全球研究表明，较浅的海底分隔哈达尔特征构成了强大的扩散障碍，推动了遗传隔离，并创造了需要保护的多样性。片足动物的种群基因组学支持海洋最深处的生态系统拥有孤立的地方性生物多样性区块。
The deepest marine ecosystem, the hadal zone, hosts endemic biodiversity resulting from geographic isolation and environmental selection pressures. However, the pan-ocean distribution of some fauna challenges the concept that the hadal zone is a series of isolated island-like habitats. Whether this remains true at the population genomic level is untested. We investigated phylogeographic patterns of the amphipod, Bathycallisoma schellenbergi, from 12 hadal features across the Pacific, Atlantic, Indian, and Southern oceans and analyzed genome-wide single-nucleotide polymorphism markers and two mitochondrial regions. Despite a cosmopolitan distribution, populations were highly restricted to individual features with only limited gene flow between topographically connected features. This lack of connectivity suggests that populations are on separate evolutionary trajectories, with evidence of potential cryptic speciation at the Atacama Trench. Together, this global study demonstrates that the shallower ocean floor separating hadal features poses strong barriers to dispersal, driving genetic isolation and creating pockets of diversity to conserve. Population genomics of an amphipod supports that the ocean’s deepest ecosystems host isolated pockets of endemic biodiversity.
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DOI：
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发表时间：
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影响因子：
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