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Genetic structure of the endangered Irrawaddy dolphin (Orcaella brevirostris) in the Gulf of Thailand
Genetics and Molecular Biology ( IF 2.1 ) Pub Date : 2021-04-02 , DOI: 10.1590/1678-4685-gmb-2020-0365
Yufei Dai 1 , Rachawadee Chantra 2 , Kongkiat Kittiwattanawong 3 , Liyuan Zhao 1 , Watchara Sakornwimon 2 , Reyilamu Aierken 1 , Fuxing Wu 1 , Xianyan Wang 1
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Abstract The Irrawaddy dolphin (Orcaella brevirostris) is an endangered, small cetacean species which is widely distributed in rivers, estuaries, and coastal waters throughout the tropical and subtropical Indo-Pacific. Despite the extensive distribution of this species, little is known of individual movements or genetic exchange among regions in Thailand. Here, we evaluate the genetic diversity and genetic structure of O. brevirostris in the eastern, northern and western Gulf of Thailand, and Andaman Sea. Although phylogenetic relationships and network analysis based on 15 haplotypes obtained from 32 individuals reveal no obvious divergence, significant genetic differentiation in mitochondrial DNA (overall FST = 0.226, P < 0.001; ΦST = 0.252, P < 0.001) is apparent among regions. Of 18 tested microsatellite loci, 10 are polymorphic and successfully characterized in 28 individuals, revealing significant genetic differentiation (overall FST = 0.077, P < 0.05) among the four sampling sites. Structure analysis reveals two inferred genetic clusters. Additionally, Mantel analysis demonstrates individual-by-individual genetic distances and geographic distances follow an isolation-by-distance model. We speculate that the significant genetic structure of O. brevirostris in Thailand is associated with a combination of geographical distribution patterns, environmental and anthropogenic factors, and local adaptations.

中文翻译:

泰国湾濒危的伊洛瓦底海豚(Orcaella brevirostris)的遗传结构

摘要伊洛瓦底海豚(Orcaella brevirostris)是一种濒临灭绝的小型鲸类,广泛分布于整个热带和亚热带印度洋-太平洋的河流,河口和沿海水域。尽管该物种分布广泛,但对泰国各地区之间的个体运动或遗传交换知之甚少。在这里,我们评估了泰国东部,北部和西部海湾以及安达曼海中短小O. brevirostris的遗传多样性和遗传结构。尽管基于32个个体的15个单倍型的系统发育关系和网络分析没有发现明显的差异,但线粒体DNA的显着遗传分化(总体FST = 0.226,P <0.001;ΦST= 0.252,P <0.001)在各地区之间很明显。在18个经过测试的微卫星基因座中,10个位点是多态性的,成功地表征了28个个体,揭示了四个采样位点之间的显着遗传分化(总体FST = 0.077,P <0.05)。结构分析揭示了两个推断的遗传簇。此外,Mantel分析还显示了逐个个体的遗传距离和地理距离遵循了逐距离隔离模型。我们推测泰国O. brevirostris的重要遗传结构与地理分布模式,环境和人为因素以及本地适应性的组合有关。壁炉架分析表明逐个个体的遗传距离和地理距离遵循逐个距离的模型。我们推测泰国O. brevirostris的重要遗传结构与地理分布模式,环境和人为因素以及本地适应性的组合有关。壁炉架分析表明逐个个体的遗传距离和地理距离遵循逐个距离的模型。我们推测泰国O. brevirostris的重要遗传结构与地理分布模式,环境和人为因素以及本地适应性的组合有关。
更新日期:2021-04-02
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