Phylogeography and molecular systematics of the Peromyscus aztecus species group (Rodentia: Muridae) inferred using parsimony and likelihood.
Phylogeography and molecular systematics of the Peromyscus aztecus species group (Rodentia: Muridae) inferred using parsimony and likelihood.
复制标题
使用简约法和似然法推断 Peromyscus aztecus 物种组（啮齿目：鼠科）的系统发育地理学和分子系统学。
DOI：
10.1093/sysbio/46.3.426
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发表时间：
1997
影响因子：
6.5
通讯作者：
C. W. Kilpatrick
中科院分区：
文献类型：
--
作者：
J. Sullivan;A. Jeffrey;Markert;C. W. Kilpatrick
在美国中部(墨西哥和中美洲)高地的几个山脉中，常见于中高海拔地区，这是一个具有高度地方性的地区。我们通过对线粒体细胞色素b(Cytb)基因的668bp进行系统发育分析，研究了这一群体的生物地理分布。简约性和似然性框架下的系统发育分析产生了相同的拓扑结构，但在加权简约性分析中，对节点支持的估计被人为地提高了。这种差异归因于简约在评估拓扑时无法优化分支长度。这些数据表明，目前被归类为瓦哈卡氏原虫的特环特佩克地峡南部和东部的类阿兹特克斯虫种群代表着一个不同的物种，遗传距离高达0.091。此外，P.hylocetes与P.aztecus的墨西哥种群(遗传距离为0.044-0.069)非常不同，支持将该分类群识别为一个独特的种。这一群的分化历史可以用一系列与冰川旋回有关的明显早至中更新世的交替事件来解释。马德雷西部山脉和科迪莱拉跨火山山脉似乎都是动物群孤立的，特万特佩克的地峡似乎是更新世的一个强大屏障，而马德雷东方山脉与南山山脉和瓦哈卡中部的高地有亲缘关系。
Mice of the Peromyscus aztecus species group occur at mid to high elevations in several mountain ranges in the highlands of Middle America (Mexico and Central America), a region of high endemicity. We examined the biogeography of this group by conducting phylogenetic analyses of 668 bp of the mitochondrial cytochrome b (cyt b) gene. Phylogenetic analyses under both parsimony and likelihood frameworks produced the same topologies, but estimates of nodal support were artificially high in weighted parsimony analyses. This difference is attributed to the inability of parsimony to optimize branch lengths when evaluating topologies. These data indicate that the P. aztecus-like populations from south and east of the Isthmus of Tehuantepec currently assigned to P. a. oaxacensis represent a distinct species, with genetic distances as high as 0.091. In addition, P. hylocetes is strongly divergent from Mexican populations of P. aztecus (genetic distances of 0.044-0.069), supporting the recognition of this taxon as a distinct species. The history of divergence in this group can be explained by a series of apparently early to middle Pleistocene vicariance events associated with glacial cycles. The Sierra Madre Occidental and Cordillera Transvolcanica each appear to be faunistically isolated, the Isthmus of Tehuantepec appears to have been a strong Pleistocene barrier, and the Sierra Madre Oriental has affinities with the Sierra Madre del Sur and the highlands of central Oaxaca.