Genetic diversity and phylogenetic relationships of Malayan tapir (Tapirus indicus) populations in the Malay Peninsula based on mitochondrial DNA control region
Genetic diversity and phylogenetic relationships of Malayan tapir (Tapirus indicus) populations in the Malay Peninsula based on mitochondrial DNA control region
复制标题
基于线粒体DNA控制区的马来半岛马来貘（Tapirus indicus）种群遗传多样性和系统发育关系
DOI：
10.1007/s10531-021-02202-x
复制
发表时间：
2021
影响因子：
3.4
通讯作者：
Annavi Geetha
中科院分区：
文献类型：
--
作者：
Lim Qi Luan;Yong Christina Seok Yien;Ng Wei Lun;Ismail Ahmad;Rovie-Ryan Jeffrine J.;Rosli Norsyamimi;Annavi Geetha
马来亚貘（Tapirus indicus）是东南亚（SEA）的濒危物种。多年来，对其种群遗传结构和进化历史的研究报道较少。特别是，虽然近年来泰国圈养的马来亚貘种群得到了相当多的研究，但自过去十年以来，在马来半岛还没有任何大规模的种群遗传研究。在这项研究中，我们报告了遗传多样性，并试图利用线粒体DNA控制区，包括以前研究的数据，对马来半岛马来亚貘的系统地理学进行推断。我们在马来西亚半岛（即马来半岛南部）样本中发现了12个新的单倍型和两个不同的马来亚貘分支，其分化时间为1460万年前（mya），而在泰国（即泰国西部边境和马来半岛北部）圈养个体中只发现了一个分支，其核苷酸多样性几乎是后者的两倍。这两个谱系在马来半岛南部同时出现，表明东南亚地区偶发性冰期和古环境变化导致了种群隔离、迁移和混合的历史事件。只有一个单倍型在这两个地区的种群之间共享，这表明在马来半岛狭窄的走廊上，基因流动受到了进一步的限制。
The Malayan tapir (Tapirus indicus) is an endangered species in Southeast Asia (SEA). Over the years, there has only been a few reports on its population genetic structure and evolutionary history in SEA. In particular, while the captive Malayan tapir population in Thailand has received fairly more research in recent years, there has not been any wide-scale population genetic study in the Malay Peninsula since the last decade. In this study, we report on the genetic diversity and attempt to make inferences on the phylogeography of the Malayan tapir in the Malay Peninsula, using the mitochondrial DNA control region, including also data from previous studies. We identified 12 novel haplotypes and two distinct Malayan tapir clades with a divergence time of 14.6 million years ago (mya) in the Peninsular Malaysia (i.e. southern Malay Peninsula) samples, as opposed to only one clade found in the Thai (i.e. Thailand western border and northern Malay Peninsula) captive individuals, with an almost two-fold higher nucleotide diversity compared to the latter. The co-occurrence of the two lineages in southern Malay Peninsula suggested past historical events of population isolation, migration and admixture as a result of episodic glacial periods and paleoenvironmental changes in SEA. Only one haplotype shared between the populations of the two regions suggested further gene flow restriction at the narrow corridor of the Malay Peninsula as of present day.