Global molecular phylogeography reveals persistent Arctic circumpolar isolation in a marine planktonic protist
Global molecular phylogeography reveals persistent Arctic circumpolar isolation in a marine planktonic protist
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DOI：
10.1073/pnas.0700520104
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发表时间：
2007-03-20
影响因子：
11.1
通讯作者：
Wade, Christopher M.
中科院分区：
文献类型：
--
作者：
Darling, Kate F.;Kucera, Michal;Wade, Christopher M.
高纬度的浮游有孔虫已被证明是研究全球海洋地理分布和基因流动模式的特别有用的模式生物。这些研究表明，在远洋海洋环境中，基因流动可以发生在很远的地方，导致世界大同，但也表明，基因流动存在生态和地理障碍，无法产生地理结构。在这里，我们进行了一项全面的全球性研究的遗传多样性的海洋原生生物物种，高纬度的浮游有孔虫新globoquadrina厚皮。我们提出了广泛的新数据集，从北太平洋和北冰洋，结合我们以前的数据从北大西洋和南大洋，使我们能够确定该物种的全球海洋地理。新的基因数据揭示了北极环极隔离和大西洋和太平洋之间两极不对称的模式。我们表明，北太平洋N。厚皮病是最近才出现的。它位于南半球的上升流系统和副极地沃茨内，而明显地不在邻近的北冰洋内。相反，北冰洋种群与北大西洋种群形成了一个遗传连续体，北大西洋种群在北方半球冰川作用开始后，更早地与南部种群隔离开来。数据从南极有孔虫形态种Globigerina bulloides也被引入，以突出的隔离和特有现象，发现在亚极地北太平洋环流。这些数据为解释和讨论全球浮游生物基因流和物种形成模式提供了视角。
The high-latitude planktonic foraminifera have proved to be particularly useful model organisms for the study of global patterns of vicariance and gene flow in the oceans. Such studies demonstrate that gene flow can occur over enormous distances in the pelagic marine environment leading to cosmopolitanism but also that there are ecological and geographical barriers to gene flow producing biogeographic structure. Here, we have undertaken a comprehensive global study of genetic diversity within a marine protist species, the high-latitude planktonic foraminiferan Neo-globoquadrina pachyderma. We present extensive new data sets from the North Pacific and Arctic Oceans that, in combination with our earlier data from the North Atlantic and Southern Oceans, allow us to determine the global phylogeography of this species. The new genetic data reveal a pattern of Arctic circumpolar isolation and bipolar asymmetry between the Atlantic and Pacific Oceans. We show that the ancestry of North Pacific N. pachyderma is relatively recent. It lies within the upwelling systems and subpolar waters of the Southern Hemisphere and remarkably not within the neighboring Arctic Ocean. Instead, the Arctic Ocean population forms a genetic continuum with the North Atlantic population, which became isolated from the southern populations much earlier, after the onset of Northern hemisphere glaciation. Data from the planktonic foraminiferal morphospecies Globigerina bulloides is also introduced to highlight the isolation and endemism found within the subpolar North Pacific gyre. These data provide perspective for interpretation and discussion of global gene flow and speciation patterns in the plankton.