Comparative phylogeography reveals consistently shallow genetic diversity in a mitochondrial marker in Antarctic bdelloid rotifers
Comparative phylogeography reveals consistently shallow genetic diversity in a mitochondrial marker in Antarctic bdelloid rotifers
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比较系统发育地理学揭示了南极蛭形轮虫线粒体标记始终存在浅层遗传多样性
DOI：
10.1111/jbi.14116
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发表时间：
2021
影响因子：
3.9
通讯作者：
Rebecchi, Lorena
中科院分区：
文献类型：
--
作者：
Cakil, Zeyneb Vildan;Garlasché, Giuseppe;Iakovenko, Nataliia;Di Cesare, Andrea;Eckert, Ester M.;Guidetti, Roberto;Hamdan, Lina;Janko, Karel;Lukashanets, Dzmitry;Rebecchi, Lorena
目的南极大陆长期孤立的历史，加上冰冻温度的恶劣生态条件，可能影响生活在那里的生物的遗传多样性模式。我们的目标是(a)测试这种模式是否可以在蛭形轮虫的线粒体标记中看到，蛭形轮虫是一组微观水生和陆生动物，(b)推测驱动这种模式的潜在机制。地点聚焦南极洲。TaxonRotifera Bdelloidea。方法分析了不同的遗传多样性指标，包括单倍型数量、积累曲线、遗传距离、到最近共同祖先的时间、DNA分类中独立进化单位的数量、地理和遗传距离的相关性强度、群体遗传中性和分化指数、潜在的历史过程、遗传多样性的多样性。从蛭形轮虫获得的大量细胞色素氧化酶亚基I （COI）序列样本中获得。我们将来自23个物种的2242个个体纳入南极和非南极分类群的比较中，在分析中直接校正样本量，然后仅使用9个采样良好的物种的有限数据集来确认结果。结果尽管南极物种在样本量、地理范围、中立性和分化指数以及遗传与地理距离的相关性等方面相似，但其遗传多样性和潜在相对年龄均低于非南极物种。主要结论：对南极蛭形类一个线粒体标记遗传多样性的广泛调查支持了其他生物先前提出的南极陆生动物的起源和维持与其他大陆不同的观点。以蛭形轮虫为例，这种差异可以推测是由于与非南极物种相比，生活在那里的物种起源更晚。
AimThe long history of isolation of the Antarctic continent, coupled with the harsh ecological conditions of freezing temperatures, could affect the patterns of genetic diversity in the organisms living there. We aim (a) to test whether such pattern can be seen in a mitochondrial marker of bdelloid rotifers, a group of microscopic aquatic and limno‐terrestrial animals and (b) to speculate on the potential mechanisms driving the pattern.LocationFocus on Antarctica.TaxonRotifera Bdelloidea.MethodsWe analysed different metrics of genetic diversity, also spatially explicit ones, including number of haplotypes, accumulation curves, genetic distances, time to the most recent common ancestor, number of independently evolving units from DNA taxonomy, strength of the correlation between geographical and genetic distances, population genetics neutrality and differentiation indices, potential historical processes, obtained from an extensive sample of cytochrome oxidase subunit I (COI) sequences obtained from bdelloid rotifers. We included 2242 individuals from 23 species in a comparison between Antarctic and non‐Antarctic taxa, correcting for sample size directly in the analyses and then by confirming the results also using only a restricted dataset of nine well‐sampled species.ResultsAntarctic species had consistently lower genetic diversity and potential younger relative age than non‐Antarctic species, even if they were similar in sample size, geographical extent, neutrality and differentiation indices, and correlation between genetic and geographical distances.Main conclusionsThe extensive survey of genetic diversity in one mitochondrial marker in Antarctic bdelloids supports previous suggestions from other organisms that the origin and maintenance of terrestrial Antarctic fauna are different from those of other continents. Such differences could be speculated to be due, in the case of bdelloid rotifers, to the more recent origin of the species living there in comparison to non‐Antarctic species.
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