Ancient hybridization and underestimated species diversity in Asian striped squirrels(genus Tamiops): inference from paternal, maternal and biparental markers
Ancient hybridization and underestimated species diversity in Asian striped squirrels(genus Tamiops): inference from paternal, maternal and biparental markers
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亚洲条纹松鼠（Tamiops属）的古代杂交和低估的物种多样性：来自父本、母本和双亲标记的推断
DOI：
10.1111/j.1469-7998.2011.00822.x
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
L.-K.
中科院分区：
文献类型：
--
作者：
Chang;S.-W.;Oshida;T.;Endo;H.;Nguyen;S. T.;Dang;C. N.;Nguyen;D. X.;Jiang;Z.;Li;Z.-J. and Lin;L.-K.
目前对genusTamiopsis的分类主要基于皮毛颜色模式，这种模式容易发生季节变化或对环境选择的趋同适应。由于物种划分困难，特别是后两个物种的划分被认为是暂定的。我们基于父本（Y染色体sryandsmcy7）、母本（线粒体细胞染色质基因）和双亲本（常染色体irbp、rag1和prkci）序列构建了所有四种tamiops物种的多位点系统发育。最大似然和贝叶斯树构建方法导致系统发育具有相似的拓扑结构。所有遗传标记均支持三种主要世系的多样化；mcclellandii;(2) T。rodolphii;(3) T。swinhoei-maritimuscomplex。以24T为基础。来自五个地方和10个地方的海洋。来自四个地方的猪。swinhoeiandT。海洋生物不是相互单系的。t的六个种群。除1个常染色体位点外，所有位点均为单系。来自越南潭岛的海上人口。常染色体系统发生更类似于Y染色体而不是线粒体系统发生。核系统发育与线粒体系统发育的不一致表明两者都不是。来自台湾的海事。产自越南富延，可能是古代杂交的后代。据估计，三种主要的tamiops世系的多样化发生在880万至670万年前（mya），可能受到喜马拉雅山脉西部地区快速隆起的影响。从5.8万年到1.7万年的多次分化可能导致了现代tamiops物种的形成。所有6个种群。Swinhoei-maritimuscomplex可以看作是一个独特的物种。散度amongT。线粒体DNA居群也处于种间水平。我们的分析强调了对物种多样性的低估。
Current classification of the genusTamiopsis mainly based on pelage color pattern that is prone to seasonal variation or convergent adaptation to environmental selection. The arrangement of four species,Tamiops mcclellandii, Tamiops rodolphii, Tamiops swinhoeiandTamiops maritimus, is regarded as tentative due to difficulty in delineating species, especially the latter two species. We constructed multi‐locus phylogenies of all fourTamiopsspecies on the basis of paternal (Y‐chromosomalSRYandSMCY7), maternal (mitochondrial cytochromebgene) and biparental (autosomalIRBP, RAG1andPRKCI) sequences. Maximum likelihood and Bayesian tree‐constructing methods resulted in phylogenies with similar topologies. All genetic markers supported diversification of three main lineages: (1)T. mcclellandii; (2)T. rodolphii; (3)T. swinhoei–maritimuscomplex. On the basis of 24T. maritimusfrom five localities and 10T. swinhoeifrom four localities,T. swinhoeiandT. maritimuswere not reciprocally monophyletic. The six populations of theT. swinhoei–maritimuscomplex were monophyletic in all loci, except for autosomal loci in oneT. maritimuspopulation from Tam Dao, Vietnam. Autosomal phylogenies were more similar to Y‐chromosomal than to mitochondrial phylogenies. Incongruence between nuclear and mitochondrial phylogenies indicates that eitherT. maritimusfrom Taiwan orT. maritimusfrom Phu Yen, Vietnam probably descended from ancient hybridization. Diversification of the three mainTamiopslineages was estimated to occur 8.8–6.7 million years ago (mya) and may have been affected by rapid uplift of the Himalayan Mountains in the western part of their range. Multiple divergences from 5.8 to 1.7 mya likely led to the formation of modernTamiopsspecies. All six populations ofT. swinhoei–maritimuscomplex could be regarded as distinct species. Divergence amongT. rodolphiipopulations in mitochondrial DNA was also at the interspecies level. Our analyses highlight the underestimation of species diversity in the genusTamiops.