Population Differentiation in the Open Sea: Insights from the Pelagic Copepod Pleuromamma xiphias
Population Differentiation in the Open Sea: Insights from the Pelagic Copepod Pleuromamma xiphias
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DOI：
10.1093/icb/icr104
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发表时间：
2011-10-01
影响因子：
2.6
通讯作者：
Goetze, Erica
中科院分区：
文献类型：
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作者：
Goetze, Erica
虽然最近的一些海洋全浮游生物的研究报告了显着的遗传结构之间的人口，目前知之甚少的生物和海洋学过程，影响人口的连接在海洋浮游生物。为了研究深度偏好如何影响海洋浮游生物的扩散，我的特点是桡足类的遗传结构与昼夜垂直迁移（DVM）（Pleuromamma xiphias），在其全球分布，并将这些结果与预期的相互作用，这种物种的栖息地深度与海洋环流和测深。来自印度洋、太平洋和大西洋28个地点的651个个体的线粒体COI序列揭示了海洋盆地内和海洋盆地之间高度显著的遗传分化。不同的远洋省份之间的有限扩散似乎发挥了重要作用，在这个物种的种群分化，在所有三个海洋盆地的已知的海洋前沿或电流系统观察到强烈的遗传断裂。印度-西太平洋（IWP）拥有一个高度独特的遗传种群，该种群在西太平洋和东印度洋都进行了采样。这表明，IWP不作为一个强大的障碍，盆地之间的基因流，正如预期的那样，尽管相对较浅的水深（400米）昼夜迁移的这个物种。在印度洋中观察到一种距离隔离的模式，样品之间的遗传分化下降到类似于800公里的空间尺度，表明在剑形剑水蚤中实现的扩散发生在比以前报道的海洋全浮游生物小得多的空间尺度上。鉴于其高度区域化的种群遗传结构，剑突棘鲷可能具有一定的适应当地海洋条件的能力，不应假定该物种在不同的远洋生物群落中的种群将以相同的方式对共同的物理或气候强迫作出反应。
Although a number of recent studies of marine holoplankton have reported significant genetic structure among populations, little is currently known about the biological and oceanographic processes that influence population connectivity in oceanic plankton. In order to examine how depth preferences influence dispersal in oceanic plankton, I characterized the genetic structure of a copepod with diel vertical migration (DVM) (Pleuromamma xiphias), throughout its global distribution, and compared these results to those expected given the interaction of this species' habitat depth with ocean circulation and bathymetry. Mitochondrial COI sequences from 651 individuals from 28 sites in the Indian, Pacific, and Atlantic Oceans revealed highly significant genetic differentiation both within and among ocean basins. Limited dispersal among distinct pelagic provinces seems to have played a major role in population differentiation in this species, with strong genetic breaks observed across known oceanographic fronts or current systems in all three ocean basins. The Indo-West Pacific (IWP) holds a highly distinct genetic population of this species that was sampled in both the western Pacific and eastern Indian Oceans. This suggests that the IWP does not act as a strong barrier to gene flow between basins, as expected, despite the relatively shallow water depth (400 m) diel migration of this species. A pattern of isolation by distance was observed in the Indian Ocean with genetic differentiation among samples down to spatial scales of similar to 800 km, indicating that realized dispersal in P. xiphias occurs over much smaller spatial scales than in previously reported oceanic holoplankton. Given its highly regionalized population genetic structure, P. xiphias may have some capacity to adapt to local oceanographic conditions, and it should not be assumed that populations of this species in distinct pelagic biomes will respond in the same way to shared physical or climatic forcing.