Limits to gene flow in a cosmopolitan marine planktonic diatom
Limits to gene flow in a cosmopolitan marine planktonic diatom
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DOI：
10.1073/pnas.1001380107
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发表时间：
2010-07-20
影响因子：
11.1
通讯作者：
Vyverman, Wim
中科院分区：
文献类型：
--
作者：
Casteleyn, Griet;Leliaert, Frederik;Vyverman, Wim
地理隔离在海洋微生物物种形成中的作用引起了激烈的争论，因为浮游微生物的高扩散潜力和大种群规模，以及在公海中明显缺乏强有力的扩散屏障。在这里，我们表明，全球分布的，开花形成硅藻物种伪菱形藻（进化枝I）的遥远的人口之间的基因流是有限的，并遵循强烈的隔离距离模式。此外，系统发育分析表明，在适当的地理和环境条件下，如更新世的明显气候变化，人口结构可能会导致物种形成，因此可能在海洋浮游微生物的多样化中发挥重要作用。因此，更好地了解控制种群结构的因素对于揭示海洋微生物中异域物种形成的作用至关重要。
The role of geographic isolation in marine microbial speciation is hotly debated because of the high dispersal potential and large population sizes of planktonic microorganisms and the apparent lack of strong dispersal barriers in the open sea. Here, we show that gene flow between distant populations of the globally distributed, bloom-forming diatom species Pseudo-nitzschia pungens (clade I) is limited and follows a strong isolation by distance pattern. Furthermore, phylogenetic analysis implies that under appropriate geographic and environmental circumstances, like the pronounced climatic changes in the Pleistocene, population structuring may lead to speciation and hence may play an important role in diversification of marine planktonic microorganisms. A better understanding of the factors that control population structuring is thus essential to reveal the role of allopatric speciation in marine microorganisms.