THE DIVERSIFICATION OF SOUTH-AMERICAN MURID RODENTS - EVIDENCE FROM MITOCHONDRIAL-DNA SEQUENCE DATA FOR THE AKODONTINE TRIBE
THE DIVERSIFICATION OF SOUTH-AMERICAN MURID RODENTS - EVIDENCE FROM MITOCHONDRIAL-DNA SEQUENCE DATA FOR THE AKODONTINE TRIBE
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DOI：
10.1111/j.1095-8312.1993.tb00924.x
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发表时间：
1993-11-01
影响因子：
1.9
通讯作者：
PATTON, JL
中科院分区：
文献类型：
--
作者：
SMITH, MF;PATTON, JL
基于线粒体细胞染色质基因801碱基对（bp），研究了南美鼠阿齿族8属28种的系统发育关系。akodontine部落约占Sigmodontinae亚科总多样性的35%，但由于缺乏对传统形态学特征变异和趋势的通用诊断和评估，目前几乎所有级别的分类都不确定。基于与其他三个部落（Oryzomyini， Phyllotini和Thomasomyini）的群外分类群的比较，该部落的单系性无法通过序列数据解决。然而，在各种简约性和距离分析中获得了高度证实的组内单系单位。其中包括一个被重新定义并在数量上占主导地位的属Akodon（与microxusand hypsimysas同义），Bolomys, Lenoxus, oxymyterus，以及一个得到强有力支持的组合，包括安第斯山脉中部的chroeomyss和‘ Akodon ’和inusand南部的nabrothrix， ‘ Akodon ’ olivaceus，以及anotiomys属，Geoxus属和chelemys属的长爪小鼠。物种内部的序列差异通常小于5%，尽管在一些高度多型的物种中可以达到10%。根据修正后的估计，部落内各属之间的差异达到35%，这一水平与不同部落代表之间的差异一样大。根据这些资料，提出了目前阿科顿人分类的变化，并讨论了该部落的起源时间和地点及其辐射。
Phylogenetic relationships based on 801 base pairs (bp) of the mitochondrial cytochromebgene are examined for eight genera and 28 species of the akodontine tribe of South American murid rodents. The akodontine tribe comprises some 35% of the total diversity of the subfamily Sigmodontinae, but the current taxonomy at virtually all levels is uncertain because of inadequate generic diagnoses and assessments of variation and trends in traditional morphological characters. Monophyly of the tribe cannot be resolved by the sequence data, based on comparisons to outgroup taxa in three other tribes (Oryzomyini, Phyllotini, and Thomasomyini). However, highly corroborated monophyletic units within the group are obtained in a variety of both parsimony and distance analyses. These include a redefined and numerically dominant genusAkodon(withMicroxusandHypsimysas synonyms),Bolomys, Lenoxus, Oxymycterus,and a strongly supported assemblage that includes the central AndeanChroeomysand‘Akodon’ andinusand the southernAbrothrix, ‘Akodon’ olivaceus,and the long-clawed mice of the generaNotiomys, Geoxus,andChelemys.Sequence divergence within species is typically less than 5%, although levels can reach 10% for some highly polytypic forms. Divergence among genera within the tribe reaches 35% in corrected estimates, a level that is as great as that among representatives of different tribes. Changes in the current classification of akodontines are suggested based on these data, and the timing and place of origin of the tribe and its radiation is discussed.