期刊
JOURNAL OF HEREDITY
卷 100, 期 3, 页码 322-328出版社
OXFORD UNIV PRESS INC
DOI: 10.1093/jhered/esn105
关键词
amazonian savanna; phylogeography; Zygodontomys
资金
- Fundo Brasileiro para a Biodiversidade (Funbio)
- Amazon Region Protected Areas Project (ARPA) [2006022308523714]
- Department of Tropical Medicine
- FIOCRUZ ( Fundacao Instituto Oswaldo Cruz)
- CNPq (Ministerio da Ciencia e Tecnologia, Brazil)
Northern South America presents a diverse array of nonforest or savanna-like ecosystems that are patchily distributed. The distribution of these open habitats has been quite dynamic during Quaternary glacial-interglacial cycles; yet, the relevance of climatically driven vicariance events to the diversification of nonforest Amazonian vertebrates remains poorly known. We analyzed karyologic and mitochondrial DNA sequence data of the genus Zygodontomys, a small cricetid rodent distributed throughout nonforest habitats of northern Amazonia. Samples analyzed represented 4 Brazilian Amazonian localities and 2 French Guiana localities. Karyologic variation among Amazonian Brazilian Zygodontomys populations is high, with, at least, 3 karyomorphotypes. Molecular phylogenetic analyses recovered 3 major clades congruent with known karyotypes, a finding that suggests the existence of 3 species, 2 of which currently undescribed. The French Guiana and Suruma clade, identified as Zygodontomys brevicauda microtinus, is characterized by 2n = 86 and is sister to the clade formed by the 2 nondescribed forms. The Rio Negro-Rio Branco form is characterized by 2n = 82, and the Ferreira Gomes-Itapoa form is characterized by 2n = 84. The distribution of the 3 Zygodontomys lineages identified is in accordance with the geography of the open vegetation patches in Northern Amazonia, and divergence time estimates relate speciation events to the middle-upper Pleistocene, supporting the prominent role of Quaternary climatically driven vicariance events in the diversification of the genus.
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