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2030-01-01
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- IOC - Artigos de Periódicos [12908]
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DIVERGENCE IN ZYGODONTOMYS (RODENTIA: SIGMODONTINAE) AND DISTRIBUTION OF AMAZONIAN SAVANNAS
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Instituto Nacional de Câncer. Programa de Genética. Rio de Janeiro, RJ, Brasil / Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Biologia e Parasitologia de Mamíferos Reservatórios Silvestres. Rio de Janeiro, RJ, Brasil.
Universidade Federal do Rio de Janeiro. Departamento de Genética. Rio de Janeiro, RJ, Brasil.
Universidade Federal do Rio de Janeiro. Museu Nacional. Setor de Mamíferos. Rio de Janeiro, RJ, Brasil.
Universidade Federal do Rio de Janeiro. Museu Nacional. Setor de Mamíferos. Rio de Janeiro, RJ, Brasil.
Universidade Luterana do Brasil. Laboratório de Pesquisa em Biodiversidade Animal. Programa de Pós-Graduação em Genética. Canoas, RS, Brasil.
Universidade Federal do Rio de Janeiro. Departamento de Genética. Rio de Janeiro, RJ, Brasil.
Universidade Federal do Rio de Janeiro. Museu Nacional. Setor de Mamíferos. Rio de Janeiro, RJ, Brasil.
Universidade Federal do Rio de Janeiro. Museu Nacional. Setor de Mamíferos. Rio de Janeiro, RJ, Brasil.
Universidade Luterana do Brasil. Laboratório de Pesquisa em Biodiversidade Animal. Programa de Pós-Graduação em Genética. Canoas, RS, Brasil.
Abstract
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 Surumu´ clade, identified
as Zygodontomys brevicauda microtinus, is characterized by 2n 5 86 and is sister to the clade formed by the 2 nondescribed
forms. The Rio Negro–Rio Branco form is characterized by 2n 5 82, and the Ferreira Gomes–Itapoa´ form is characterized
by 2n 5 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 themiddle-upper Pleistocene,
supporting the prominent role of Quaternary climatically driven vicariance events in the diversification of the genus.
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