Patterns of genetic variation do not correlate with geographical distance in the reef-building coral Pocillopora meandrina in the South Pacific
Patterns of genetic variation do not correlate with geographical distance in the reef-building coral Pocillopora meandrina in the South Pacific
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DOI：
10.1111/j.1365-294x.2005.02430.x
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发表时间：
2005-06-01
影响因子：
4.9
通讯作者：
Veuille, M
中科院分区：
文献类型：
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作者：
Magalon, H;Adjeroud, M;Veuille, M
扩散可能是造礁珊瑚在重大干扰后恢复能力的一个关键因素。我们研究了地理结构的模式，使用四个微卫星标记在7个南太平洋人口的Pocillopora meandrina，一个主要的珊瑚物种从波利尼西亚。种群内的变异表明杂合子缺乏的证据。在汤加和社会群岛之间的大规模（2000公里）检测到种群之间的遗传分化。在社会群岛内，来自波拉波拉岛、莫雷阿岛和塔希提岛的五个研究群体中有四个彼此之间没有显著差异。出乎意料的是，在莫雷阿岛调查的三个种群之一在遗传上与该岛的其他两个种群（相距5公里和10公里）以及该群岛中其他两个被调查岛屿的种群不同。我们不能排除这种模式是一种平衡状态的可能性，即短程扩散在当地比长程扩散更有差异，正如其他研究报告的类似模式所表明的那样。另一种与所有观察结果一致的解释是，这是一次大规模破坏事件的标志，例如漂白事件，随后是新殖民者最近恢复的人口。
Dispersal may be a critical factor in the ability of reef-building corals to recover after major disturbances. We studied patterns of geographical structure using four microsatellite markers in seven South Pacific populations of Pocillopora meandrina, a major coral species from Polynesia. Variation within populations showed evidence of heterozygote deficiency. Genetic differentiation between populations was detected at a large scale (2000 km) between the Tonga and the Society Islands. Within the Society Islands, four of the five studied populations from Bora Bora, Moorea and Tahiti were not significantly different from each other. Unexpectedly, one of the three populations surveyed in Moorea was genetically different from the other two populations of this island (that were 5 and 10 km apart), and from the populations of the other two surveyed islands in this archipelago. We cannot rule out the possibility that this pattern is an equilibrium state, whereby short-range dispersal is locally more differentiating than long-range dispersal, as has been suggested by similar patterns reported in other studies. An alternative explanation that is globally consistent with all observations is that this is the signature of a large-scale destruction event, as for instance a bleaching event, followed by the recent restoration of populations by new colonists.