Biogeographically dynamic genetic structure bridging two continents in the monotypic Central American rodent Ototylomys phyllotis
Biogeographically dynamic genetic structure bridging two continents in the monotypic Central American rodent Ototylomys phyllotis
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单一型中美洲啮齿动物叶耳鼠连接两大洲的生物地理动态遗传结构
DOI：
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
E. Vázquez‐Domínguez
中科院分区：
文献类型：
--
作者：
T. Gutiérrez;E. Vázquez‐Domínguez
中美洲是一个理想的地区，在其中研究的历史分歧和种群遗传分化的模式，因为其非常动态的地理，构造和气候的历史。啮齿动物Ototylomys phyllotis是Ototylomys属的唯一现存物种，分布在从墨西哥特万特佩克地峡到哥斯达黎加中部的这一区域内，为研究该物种种群结构的时空格局和解释这些格局的生态和进化过程提供了极好的机会。我们估计的遗传多样性和结构内和之间的O. phyllotis，时间的分歧，并使用线粒体DNA和系统发育和地理计算分析的综合组合的迁移模式。我们的研究结果支持单系的耳鼠属。我们确定了O. phyllotis内的三个主要的地理谱系，这些谱系与其多样化有关，并与形成中美洲的主要地质特征相吻合。该属的起源是在3.35 Mya之前，在大美洲生物交换（GABI）之前，它最初出现在其目前分布的中心（洪都拉斯/萨尔瓦多）附近，后来在一系列GABI脉冲之后传播（3.20-2.84 Mya）。该物种最初向北扩散到恰帕斯和危地马拉高地（2.27 Mya），然后多样化。后来的扩散（1.82 Mya）发生在南部（尼加拉瓜，哥斯达黎加）和北部（伯利兹）。尤卡坦半岛被来自伯利兹的人殖民（0.8百万年）。在整个范围内都发生了极高的辐射和范围扩展，其中最高的是尤卡坦半岛（0.125 Mya）。
Central America is an ideal region in which to study patterns of historical divergence and population genetic differentiation, because of its extraordinarily dynamic biogeographical, tectonic, and climatic history. The rodent Ototylomys phyllotis is the only extant species of the genus Ototylomys and is distributed within this region from the Isthmus of Tehuantepec, Mexico, to central Costa Rica, offering an excellent opportunity to study spatial and temporal patterns of population structure of the species and to explain the ecological and evolutionary processes responsible for those patterns. We estimated the genetic diversity and structure within and between populations of O. phyllotis, times of divergence, and migration patterns using mitochondrial DNA and a comprehensive combination of phylogenetic and phylogeographical computational analyses. Our results support monophyly of the genus Ototylomys. We identified three major phylogeographical lineages within O. phyllotis that are linked to its diversification and coincide with the main geological features that shaped Middle America. The origin of the genus was before 3.35 Mya, prior to the Great American Biotic Interchange (GABI), and its initial occurrence was near the centre of its current distribution (Honduras/El Salvador), from which it later spread (3.20–2.84 Mya) following a series of GABI pulses. The species showed an initial northward dispersal to the Chiapas and Guatemala highlands (2.27 Mya) followed by diversification. A later dispersal (1.82 Mya) occurred toward both the south (Nicaragua, Costa Rica) and the north (Belize). The Yucatan peninsula was colonized (0.8 Mya) by individuals from Belize. Extremely high radiation and range expansion occurred throughout the entire range, the highest of which was in the Yucatan peninsula (0.125 Mya). © 2012 The Linnean Society of London, Biological Journal of the Linnean Society, 2012, 107, 593–610.
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影响因子：
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