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首页> 外文期刊>Marine biology >High genetic diversity of the symbiotic dinoflagellates in the coral Pocillopora meandrina from the South Pacific
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High genetic diversity of the symbiotic dinoflagellates in the coral Pocillopora meandrina from the South Pacific

机译：南太平洋Pocillopora meandrina珊瑚中共生鞭毛藻的高遗传多样性

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摘要

Symbioses between dinoflagellates in the genus Symbiodinium (commonly referred to as zooxanthellae) and scleractinian corals are an essential feature for the maintenance of coral reefs. The fine-scale diversity and population structure of the zooxanthellae inhabiting the coral Pocillopora meandrina, a major reef building species in Polynesia, was examined. We used two polymorphic microsatellites to study seven populations from the South Pacific, whose host structuring has been previously investigated. The symbionts of P. meandrina showed high levels of diversity, with more than one zooxanthella genotype being identified in most of the host individuals. Genetic differentiation between sym- biont populations was detected at a large scale (2,000 km) between the Tonga and the Society Archipelagos. Within the Society Archipelago, the two most remote populations (Tahiti and Bora-Bora; 200 km apart) were only weakly differentiated from each other. Statistical tests demonstrated that the symbiont genetic structure was not correlated with that of its host, suggesting that dispersal of the symbionts, whether they are transported within a host larva or free in the water, depends mainly on distance and water currents. In addition, the data suggests that hosts may acquire new symbionts after maternal transmission, possibly following a disturbance event. Lastly, the weak differentiation between symbiont populations of P. verrucosa and P. meandrina, both from Moorea, indicated that there was some host-symbiont fine-scale specificity detectable at the genetic resolution offered by microsatellites.
机译：共生菌属（通常称为兽黄藻）中的鞭毛藻与巩膜珊瑚之间的共生是维持珊瑚礁的基本特征。研究了栖息在波利尼西亚主要珊瑚礁物种Pocillopora Meandrina的人兽黄藻的精细尺度多样性和种群结构。我们使用两个多态微卫星研究了南太平洋的七个种群，这些种群的宿主结构先前已被调查过。 P. Meandrina的共生体显示出高水平的多样性，在大多数寄主个体中鉴定出一种以上的虫黄藻基因型。在汤加和群岛群岛之间大规模（2,000公里）发现了共生种群之间的遗传分化。在社会群岛内，两个最偏远的人口（大溪地和波拉波拉岛；相距200公里）彼此之间的区别很小。统计测试表明，共生体的遗传结构与其宿主的遗传结构不相关，这表明共生体的扩散，无论是在宿主幼体中运输还是在水中游离，主要取决于距离和水流。另外，数据表明宿主可能在发生干扰事件后在母亲传播后获得新的共生体。最后，来自Moorea的疣状假单胞菌和卑鄙的假单胞菌共生种群之间的微弱区分表明，在微卫星提供的遗传分辨率下，可以检测到一些宿主共生体细尺度特异性。

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