Phylogenetic and biogeographic relationships of the mouse opossum Thylamys (Didelphimorphia, Didelphidae) in southern South America.
Phylogenetic and biogeographic relationships of the mouse opossum Thylamys (Didelphimorphia, Didelphidae) in southern South America.
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南美洲南部小鼠负鼠Thylamys（Didelphimorphia，Didelphidae）的系统发育和生物地理学关系。
DOI：
10.1016/s1055-7903(02)00242-7
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发表时间：
2002
影响因子：
4.1
通讯作者：
Meynard,AndrésP
中科院分区：
文献类型：
--
作者：
EduardoPalma,R;Rivera-Milla,Eric;Yates,TerryL;Marquet,PabloA;Meynard,AndrésP
利用线粒体细胞色素B基因的核苷酸序列分析了袋鼠属负鼠种间的系统发育关系。根据该属6个种中5个种的约1000bp的序列，并考虑到其中一些种的不同位置，我们得出结论：T.产于巴拉圭东部亚热带森林的macrura是最原始的分类单元，该属随后的辐射主要通过创始者效应物种形成来解释。这一进化过程可以解释T. pusilla、细叶木霉T. venusta，T. pallidior和T.分别在查科、玻利维亚南部和北方阿根廷、安第斯高原、智利沿海沙漠和秘鲁沿海发现了秀丽隐杆线虫。分子钟的校准将更新世设定为袋鼠物种分化的时期。分子结果证实了居住在智利北方“前科迪勒拉”地区的种群之间的强烈遗传联系（T。帕莱迪奥）和贯穿阿塔卡马沙漠到智利北方低地的峡谷。我们的研究结果证实了两种Thylamys在智利的存在，T。pallidior和T.分别在阿塔卡马沙漠内和南部。
Nucleotide sequence data from the mitochondrial cytochrome b gene were used to evaluate the phylogenetic relationships among mouse opossum species of the genus Thylamys. Based on approximately 1000bp in five of the six species of the genus and including different localities for some of the species, we concluded that T. macrura from the subtropical forests of eastern Paraguay is the most primitive taxon. Subsequent radiation of the genus is explained mainly via founder effect speciation. This evolutionary scenario would account for the speciation of T. pusilla, T. venusta, T. pallidior, and T. elegans in the Chaco, southern Bolivia and northern Argentina, the Andean Altiplano, the Coastal Desert of Chile, and coastal Perú, respectively. Calibration of a molecular clock set the Pleistocene as the period for the differentiation of Thylamys species. The molecular results confirm the strong genetic connection between populations that inhabit the “pre-cordillera” of northern Chile (T. pallidior) and the canyons that run through the Atacama Desert to the lowlands in northern Chile. Our results confirm the occurrence of two Thylamys species in Chile, T. pallidior and T. elegans, within and south to the Atacama Desert, respectively.