Phylogeny and evolution of the neotropical rodent genus Calomys: inferences from mitochondrial DNA sequence data.
Phylogeny and evolution of the neotropical rodent genus Calomys: inferences from mitochondrial DNA sequence data.
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新热带啮齿动物 Calomys 属的系统发育和进化：线粒体 DNA 序列数据的推论。
DOI：
10.1006/mpev.2001.0965
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
Yates,TL
中科院分区：
文献类型：
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作者：
Salazar-Bravo,J;Dragoo,JW;Tinnin,DS;Yates,TL
美鼠属野鼠体型较小，主要是食谷啮齿动物，常见于南美洲的几个栖息地。迄今为止，已提出的形态，染色体和生化数据的基础上，该属的单基因，往往与矛盾的结果，由于不完整的物种采样或方法的缺陷。本文根据细胞色素B基因全序列分析了10种甘鼠属植物之间的亲缘关系。我们的分析表明，Calomys是由两个主要的分支，一个主要与山地栖息地与随后的入侵低地栖息地和另一个物种仅限于低地栖息地北部和南部的亚马逊流域。该属的进化可能伴随着染色体二倍体数量的减少，这在两个进化谱系中独立发生。根据Auliscomys和Loxodontomys之间的分裂校准的“时钟”表明，该属几乎不存在的化石记录大大低估了其物种之间的分歧时间。
Field mice of the genus Calomys are small, mostly granivorous rodents common to several habitats in South America. To date, phylogenies for the genus have been proposed on the basis of morphological, chromosomal, and biochemical data, often with contradictory results due to incomplete species sampling or methodological shortcomings. In this paper, we propose relationships among 10 species of Calomys based on the complete cytochrome b gene sequence. Our analyses show that Calomys is constituted by two major clades, one mostly associated with mountain habitats with subsequent invasions to lowland habitats and another with species restricted to lowland habitats both north and south of the Amazon basin. The evolution of the genus was likely accompanied by a reduction of chromosome diploid numbers that occurred independently in each of the two evolutionary lineages. A “clock” calibrated on the split between Auliscomys and Loxodontomys suggests that the almost nonexistent fossil record for the genus greatly underestimates divergence times among its species.