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首页> 外文期刊>Marine ecology >Inter- and intra-colonial genotypic diversity in hermatypic hydrozoans of the family Milleporidae
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Inter- and intra-colonial genotypic diversity in hermatypic hydrozoans of the family Milleporidae

机译：Milleporidae家族的生殖器动物的殖民间和殖民地内的基因型多样性

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Genetic diversity is the basis for adaptation and therefore of primary scientific interest, especially in species that are threatened by anthropogenic challenges, e.g. climate change and/or pollution. Coral reefs are among the most threatened but also the most diverse ecosystems and have therefore been studied quite extensively. So far, most investigations have focused on scleractinian corals while the equally important reef builders, the hydrozoans, have been less considered. Here we provide the first study of genotypic variability as well as intra-colonial genetic variability, the co-occurrence of more than one genotype within a single colony, in Milleporidae based on microsatellites. We analysed two geographically distinct populations from the Millepora dichotoma complex, one from the Red Sea and one from the Great Barrier Reef. Additionally, a population of Millepora platyphylla was analysed from French Polynesia. We compared microsatellite multilocus genotypes and cytochrome c oxidase subunit I haplotypes for each of the three field sites to detect levels of genotypic diversity at the intra- and inter-specific levels. Furthermore, we examined all species for the occurrence of intra-colonial genetic variability, a recently described mechanism in scleractinian corals that might enhance the adaptive potential of sessile organisms. We found both species and all field sites to be genotypically variable. Twelve mitochondrial haplotypes and 27 multilocus microsatellite genotypes were identified. In addition, intra-colonial genetic variability was detected in the M.dichotoma complex from the Great Barrier Reef as well as in M.platyphylla from French Polynesia. All of the intra-colonial genetically variable colonies consisted of one main genotype and a second divergent genotype caused by somatic mutations (mosaicism). Our study proves that Milleporidae are genetically variable and that the phenomenon of intra-colonial genetic variability also occurs in this important reef-building family.
机译：遗传多样性是适应的基础，因此是主要的科学兴趣，尤其是在受到人为挑战（例如人为挑战）威胁的物种中。气候变化和/或污染。珊瑚礁是最受威胁但也是最多样化的生态系统之一，因此已经进行了广泛的研究。到目前为止，大多数研究都集中在巩膜珊瑚上，而同等重要的礁石建造者水生动物则没有被考虑。在这里，我们提供了基于微卫星的千足虫的基因型变异性以及殖民地内遗传变异性（单个菌落中多个基因型的共现）的首次研究。我们分析了Millepora dichotoma复合体中的两个地理上不同的种群，一个来自红海，一个来自大堡礁。另外，分析了来自法属波利尼西亚的千叶白粉菌的种群。我们比较了三个现场的每个站点的微卫星多基因座基因型和细胞色素C氧化酶亚基I单倍型，以检测种内和种间水平的基因型多样性水平。此外，我们检查了所有物种的殖民地内部遗传变异性的发生，这是一种最近描述的巩膜珊瑚中的机制，可能会增强无柄生物的适应能力。我们发现物种和所有野外站点都是基因型可变的。确定了十二种线粒体单倍型和27个多位点微卫星基因型。此外，在大堡礁和法属波利尼西亚的白僵菌中也发现了殖民地内部的遗传变异。所有殖民地内部的遗传变异菌落均由一种主要的基因型和由体细胞突变（马赛克主义）引起的第二种不同的基因型组成。我们的研究证明，千足虫是遗传变异的，并且在这个重要的造礁家庭中也发生了殖民地内遗传变异现象。

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