Elucidating the multiple genetic lineages and population genetic structure of the brooding coral Seriatopora (Scleractinia: Pocilloporidae) in the Ryukyu Archipelago
Elucidating the multiple genetic lineages and population genetic structure of the brooding coral Seriatopora (Scleractinia: Pocilloporidae) in the Ryukyu Archipelago
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DOI：
10.1007/s00338-017-1557-x
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发表时间：
2017-06-01
期刊：
影响因子：
3.5
通讯作者：
Mitarai, Satoshi
中科院分区：
文献类型：
--
作者：
Nakajima, Yuichi;Nishikawa, Akira;Mitarai, Satoshi
阐明物种多样性和连通性对于保护珊瑚礁群落和了解珊瑚种群的特征至关重要。本研究利用线粒体DNA控制区和微卫星对日本琉球群岛的10个地点进行了系统发育和种群遗传分析，以评估种群的物种多样性、种内遗传多样性和种群间的遗传分化。在我们的标本中至少检测到三个Seriatopora的遗传谱系(Seriatopora-A、-B和-C)。我们收集的菌落在形态上与海龙相似，但可能包括多个遗传上不同的物种。尽管有性繁殖保持了所有遗传谱系的种群，但Seriatopora-A和Seriatopora-C的遗传多样性低于Seriatopora-B。群体间的遗传分化关系为：成对F(ST)=0.064~0.116(P=0.001)，成对G‘(ST)=0.107~0.209(P=0.001)。此外，在Seriatopora-B中只有一名来自未抽样人口的移民在基因上被确认。由于Seriatopora仔鱼的定居高峰期在1d内，而几乎所有的仔鱼都在产卵后5d内定居，因此我们的观察可能与其扩散能力较低有关。琉球群岛的Seriatopora种群可能不会恢复，除非从遥远的种群中大量招募新的成员。
The elucidation of species diversity and connectivity is essential for conserving coral reef communities and for understanding the characteristics of coral populations. To assess the species diversity, intraspecific genetic diversity, and genetic differentiation among populations of the brooding coral Seriatopora spp., we conducted phylogenetic and population genetic analyses using a mitochondrial DNA control region and microsatellites at ten sites in the Ryukyu Archipelago, Japan. At least three genetic lineages of Seriatopora (Seriatopora-A, -B, and -C) were detected in our specimens. We collected colonies morphologically similar to Seriatopora hystrix, but these may have included multiple, genetically distinct species. Although sexual reproduction maintains the populations of all the genetic lineages, Seriatopora-A and Seriatopora-C had lower genetic diversity than Seriatopora-B. We detected significant genetic differentiation in Seriatopora-B among the three populations as follows: pairwise F (ST) = 0.064-0.116 (all P = 0.001), pairwise G''(ST) = 0.107-0.209 (all P = 0.001). Additionally, only one migrant from an unsampled population was genetically identified within Seriatopora-B. Because the peak of the settlement of Seriatopora larvae is within 1 d and almost all larvae are settled within 5 d of spawning, our observations may be related to low dispersal ability. Populations of Seriatopora in the Ryukyu Archipelago will probably not recover unless there is substantial new recruitment from distant populations.