Degree and pattern of gene flow in several scleractinian corals in the Ryukyu Archipelago, southern Japan
Degree and pattern of gene flow in several scleractinian corals in the Ryukyu Archipelago, southern Japan
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DOI：
10.2984/1534-6188(2008)62
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发表时间：
2008-07-01
期刊：
影响因子：
0.7
通讯作者：
Nishikawa, Akira
中科院分区：
文献类型：
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作者：
Nishikawa, Akira
珊瑚礁生物浮游幼虫的扩散距离受珊瑚礁生物的生态特征和环境因素（如水流和生物礁的物理结构）的影响。本文综述了琉球群岛石珊瑚的遗传分化程度和模式，并与其他地区进行了比较。小规模的遗传异质性，但广泛的同质性，在一些物种，包括在琉球的育雏和产卵。与其他地区的比较表明，有限的基因流动在一个小的空间尺度（即，自我招募）似乎在许多区域都有发生。然而，在更大的距离基因流的程度是复杂的和物种依赖性。与琉球的保护，幼虫来源假说，其中指出，珊瑚幼虫招募从Kerama群岛的冲绳群岛的含义，是一致的结果，说明在一些物种的高基因流。因此，Kerama群岛的珊瑚保护是高度优先事项。琉球南部和中部之间的遗传断裂的检测是不常见的物种。在珊瑚中观察到的遗传结构是高度可变的，取决于琉球群岛的物种和空间尺度。此外，珊瑚复杂的遗传结构可能与珊瑚特有的破坏性事件有关，如漂白、棘冠海星的爆发和疾病。进一步的研究将通过使用不同的标记（例如，这将为珊瑚礁的养护提供有用的信息。
Dispersal distance of planktonic larvae of coral reef organisms is influenced by their ecological characteristics and environmental factors such as current flow and physical structure of reefs. This study reviews the degree and pattern of genetic differentiation in scleractinian corals in the Ryukyu Archipelago, compared with other regions. Small-scale genetic heterogeneity, but broadscale homogeneity, was detected in some species, including brooders and spawners in the Ryukyus. Comparison with other regions indicated that limited gene flow on a small spatial scale (i.e., self-recruitment) seemed to occur in many regions. However, the degree of gene flow over larger distances was complex and species-dependent. With an implication for conservation in the Ryukyus, the larval source hypothesis, which states that coral larvae were recruited from the Kerama Islands to the Okinawa Islands, was consistent with results illustrating high gene flow in some species. Thus, conservation of corals in the Kerama Islands is high priority. Detection of genetic breaks between the southern and central Ryukyus was not common among species. The genetic structure observed in corals is highly variable and depends on both species and spatial scale in the Ryukyus. In addition, the complex genetic structures of corals may be related to coral-specific destructive events, such as bleaching, outbreaks of crown-of-thorns starfish, and disease. Further studies will provide new insights and a more detailed view of die genetic structure of corals by using different markers (e.g., microsatellites) and approaches (assignment tests and clustering analysis), which will provide useful information for coral reef conservation.