[Effects of divergent habitat on genetic structure of population of Excoecaria agallocha, a mangrove associate].

Zhi-Hong Zhang, Tian Tang, Ren-Chao Zhou, Yu-Guo Wang, Shu-Guang Jian, Cai-Rong Zhong, Su-Hu Shi
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Abstract

Genetic diversity and population genetic structure of Excoecaria agallocha, a typical mangrove associate species,were surveyed at divergent habitats (intertidal and inland). In general, intertidal populations had higher genetic diversity than inland populations. Genetic differentiation among intertidal populations (G(ST) = 0.191) were smaller than that among inland populations (G(ST) = 0.218), suggesting that gene flow via seed among intertidal populations were stronger. In an analysis of molecular variance (AMOVA), we found that 15.13% of the genetic variance could be explained by the differentiation between habitats, as compared to only 11.63% to geographical effects among five sits 181 -759 km distant from each other. This implies that markedly selection regimes result in habitat adaptation. Isolation-by-distance, Southwest Monsoon Current,China Coastal Current and genetic drift played important role in genetic differentiation of China population of Excoecaria agalocha.

[生境差异对红树伴生物种褐条鱼种群遗传结构的影响]。
在不同生境(潮间带生境和内陆生境)对红树典型伴生种褐藻(Excoecaria agallocha)的遗传多样性和种群遗传结构进行了调查。总体而言,潮间带种群的遗传多样性高于内陆种群。潮间带种群间的遗传分化(G(ST) = 0.191)小于内陆种群间的遗传分化(G(ST) = 0.218),表明潮间带种群间通过种子的基因流动更强。在分子变异分析(AMOVA)中,我们发现15.13%的遗传变异可以用生境之间的差异来解释,而在相距181 ~ 759 km的5个地点之间,地理效应只能解释11.63%的遗传变异。这意味着明显的选择机制导致了生境适应。距离隔离、西南季风流、中国海岸流和遗传漂变对银果鱼中国居群的遗传分化起重要作用。
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