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首页> 外文期刊>Genetica >Genetic variation and population structuring in two brooding coral species ( Siderastrea stellata and Siderastrea radians ) from Brazil
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Genetic variation and population structuring in two brooding coral species ( Siderastrea stellata and Siderastrea radians ) from Brazil

机译：来自巴西的两种育成珊瑚物种（Siderastrea stellata和Siderastrea radians）的遗传变异和种群结构

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摘要

Siderastrea stellata and S. radians are scleractinian coral species that present a remarkable overlap of diagnostic characteristics and sympatric distribution. Moreover, both are viviparous with similar reproductive strategies and with a gregarious larval behavior. Samples of both species from the Brazilian coast were analyzed using 18 isozymic loci to quantify their genetic variability and populational structure. Results confirmed species identity, high intrapopulational variability and revealed moderate genetic structuring among all samples (S. stellata: F ST = 0.070; S. radians: F ST = 0.092). Based on genotypic diversity analysis, there was evidence that local recruitment may have a minor role in the populations (mean, G o :G e = 1.00 ± 0.0003 SD for S. stellata and 0.99 ± 0.0023 SD for S. radians). Deviations towards heterozygote deficiencies found in both Siderastrea species could be explained by the Wahlund effect, since there was evidence that populations might be composed of colonies of different ages. In S. radians it is also likely that there is some inbreeding occurring in the studied populations. Despite the brooding pattern and the gregarious larval behavior, our data suggest the occurrence of gene flow along the Brazilian coast. This is the first study on population genetics of Brazilian reef corals.
机译：Siderastrea stellata和S. radians是Scleractinian珊瑚物种，表现出明显的诊断特征和同胞分布。而且，它们都具有相似的繁殖策略和具群居性的幼虫行为。使用18个同工酶基因座分析了来自巴西海岸的两个物种的样本，以量化其遗传变异性和种群结构。结果证实了所有物种之间的物种同一性，高种群内变异性和揭示了适度的遗传结构（S. stellata：F ST = 0.070； S。radians：F ST = 0.092）。根据基因型多样性分析，有证据表明，本地招募在人群中可能起着较小的作用（平均值，对于S，G o ：G e = 1.00±0.0003 SD。弧度和0.99±0.0023 SD（弧度）。 Wahlund效应可以解释两种Siderastrea物种中杂合子缺乏的差异，因为有证据表明种群可能由不同年龄的菌落组成。在弧菌中，研究种群中也有可能发生近交。尽管有育雏模式和幼虫群居行为，但我们的数据表明沿巴西海岸发生了基因流动。这是对巴西礁珊瑚种群遗传学的首次研究。

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