Multi-locus phylogeny and species delimitations of the striped-back shrew group (Eulipotyphla: Soricidae): implications for cryptic diversity, taxonomy and multiple speciation patterns.
Multi-locus phylogeny and species delimitations of the striped-back shrew group (Eulipotyphla: Soricidae): implications for cryptic diversity, taxonomy and multiple speciation patterns.
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DOI：
10.1016/j.ympev.2022.107619
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发表时间：
2022-08
影响因子：
4.1
通讯作者：
Shun-de Chen;Keyi Tang;Xu-ming Wang;Fengjun Li;Changkun Fu;Yang Liu;Abu ul Hassan Faiz;Xuelong Jiang;Shaoying Liu
中科院分区：
文献类型：
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作者：
Shun-de Chen;Keyi Tang;Xu-ming Wang;Fengjun Li;Changkun Fu;Yang Liu;Abu ul Hassan Faiz;Xuelong Jiang;Shaoying Liu
斑背鼠群体在头骨和身体大小、尾巴长度和背纹亮度方面表现出显著的差异；近年来有报道称核型和DNA变异。在这项研究中，我们调查了该群的系统发育结构，以及中国西南山脉和邻近山脉，包括南喜马拉雅山脉的物种形成模式和人口学历史。巴山、巫山、秦岭。我们对该群体已知范围内126个地点的462个样本进行了测序，并基于来自两个线粒体、六个核和两个Y染色体标记的6.2kb的序列数据进行了测序和分析。对连接的mtDNA数据进行的系统发育分析显示，在条纹背鹭群体中有14个共域和独立进化的谱系，包括Sorex bedfordiae、S.Cylindricauda、S.Exelsus、S.sinalis和几个神秘物种。所有串联的数据(10个基因)显示了与该群体的mtDNA谱系相比一致的遗传结构，而核和Y染色体数据显示了与横纹脊椎动物群体的mtDNA谱系相比不一致的遗传结构。物种划分分析和较深的遗传距离清楚地支持了14个进化谱系的物种地位。分异时间估算表明，条纹鼠种群开始从中更新世(2.34 Ma)开始多样化，然后在2.14 Ma左右繁盛，随后在更新世经历了一系列快速的多样化。我们的结果还揭示了西南中国山脉及其邻近山区复杂的地形和气候条件下物种形成的多种机制。青藏高原的隆升、第四纪的气候振荡、河流屏障、生态海拔梯度、地形多样性以及它们自身的低扩散能力可能推动了斑腿鼠类的物种形成、遗传结构和系统地理格局。
The striped-back shrew group demonstrates remarkable variation in skull and body size, tail length, and brightness of the dorsal stripe; and karyotypic and DNA variation has been reported in recent years. In this study, we investigated the phylogenetic structure of the group, as well as speciation patterns and demographic history in Mountains of Southwestern China and adjacent mountains, including the southern Himalayas, Mts. Bashan, Wushan, and Qinling. We sequenced a total of 462 specimens from 126 localities in the known range of the group, which were sequenced and analyzed based on 6.2 kb of sequence data from two mitochondrial, six nuclear, and two Y chromosome markers. Phylogenetic analyses of the concatenated mtDNA data revealed 14 sympatric and independently evolving lineages within the striped-back shrew group, includingSorex bedfordiae,S. cylindricauda,S. excelsus,S. sinalisand several cryptic species. All concatenated data (ten genes) showed a consistent genetic structure compared to the mtDNA lineages for the group, whereas the nuclear and the Y chromosome data showed a discordant genetic structure compared to the mtDNA lineages for the striped-back shrew group. Species delimitation analyses and deep genetic distance clearly support the species status of the 14 evolving lineages. The divergence time estimation suggested that the striped-back shrew group began to diversify from the middle Pleistocene (2.34 Ma), then flourished at approximately 2.14 Ma, followed by a series of rapid diversifications through the Pleistocene. Our results also revealed multiple mechanisms of speciation in the Mountains of Southwestern China and Adjacent Mountains with complex landscapes and climate. The uplifting of the Qinghai-Tibetan Plateau, Quaternary climate oscillations, riverine barriers, ecological elevation gradients, topographical diversity, and their own low dispersal capacity may have driven the speciation, genetic structure, and phylogeographic patterns of the striped-back shrew group.