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Journal of Heredity Advance Access published online on December 5, 2008
Journal of Heredity, doi:10.1093/jhered/esn099
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© The American Genetic Association. 2008. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.

Phylogenetic and Phylogeographic Patterns in Sigmodontine Rodents of the Genus Oligoryzomys

Gustavo B. Miranda, Luiz F. B. Oliveira, Jaqueline Andrades-Miranda, Alfredo Langguth, Sidia M. Callegari-Jacques, and Margarete S. Mattevi

From the Programa de Pós-Graduação em Genética e Biologia Molecular, Universidade Federal do Rio Grande do Sul, Caixa Postal 15053, 91501-970, Porto Alegre, Rio Grande do Sul, Brazil (Miranda and Callegari-Jacques); the Museu Nacional, Setor de Mastozoologia, Universidade Federal do Rio de Janeiro, 20940-040, Rio de Janeiro, Brazil (Oliveira); the Curso de Pós-Graduação em Genética e Toxicologia Aplicada, Universidade Luterana do Brasil, Av. Farroupilha, 8001, 92420-280, Canoas, Rio Grande do Sul, Brazil (Andrades-Miranda, Miranda, and Mattevi); the Departamento de Sistemática e Ecologia, Universidade Federal da Paraíba, Campus Universitário, 58059-900 João Pessoa, Paraíba, Brazil (Langguth); the Departamento de Estatística, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, 91509-900 Porto Alegre, Rio Grande do Sul, Brazil (Callegari-Jacques)

Address correspondence to M. S. Mattevi at the address above, or e-mail: mattevi{at}terra.com.br.

The sigmodontine South American rodent genus Oligoryzomys was first described as a subgenus of the genus Oryzomys to group together species distinguished by morphological measurements. To describe the dispersion patterns of this genus in South America, in this study, a total of 100 sequences were analyzed and compared with sequences of 9 Oligoryzomys species from GenBank. The sequences comprised 90 mitochondrial cytochrome b genes and 10 nuclear interphotoreceptor retinoid-binding protein genes, from 75 individuals of 7 species from 27 localities. Topologies of different phylogenetic trees revealed Oligoryzomys as a monophyletic genus containing 2 main species groups, one designated as the "Amazon–Cerrado" assemblage and the second as the "Pampa–Andean" clade. The north-to-south geographic pattern observed supports the hypothesis that the genus started from the northern Andes, occupied the Amazon and the Cerrado, and later inhabited the more southern regions of South America.

Key Words: cytochrome b • IRBP • Oligoryzomys • phylogeography • phylogenetics • Sigmodontinae

Corresponding Editor: William Modi

Received August 25, 2008
Revised October 9, 2008
Accepted October 22, 2008


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