Abstract
The population genetic structure of two sympatric species of sigmodontine rodents (Oligoryzomys nigripes and Euryoryzomys russatus) was examined for mitochondrial DNA (mtDNA) sequence haplotypes of the control region. Samples were taken from three localities in the Atlantic Rain Forest in southern Brazil, along an altitudinal gradient with different types of habitat. In both species there was no genetic structure throughout their distribution, although levels of genetic variability and gene flow were high.
Highlights
The genetic structure of populations is a necessary and important task for better understanding the history and future evolutionary potential of a species and its populations, especially from a conservation perspective (Burgman et al 1993; Patton et al 1996)
Oryzomyini is a specious assemblage (Reig 1984, 1986) that encompasses 15 genera, including Euryoryzomys Weksler et al, 2006 and Oligoryzomys Bangs, 1900, the latter being first proposed as a subgenus of Euryoryzomys
Oligoryzomys nigripes (Olfers, 1818) is a small mouse that occurs in grasslands and forests in Brazil (Mares et al 1989; Stallings 1989; Vieira and Marinho-Filho 1998), and is considered a habitat-generalist species (Dalmagro and Viera 2005)
Summary
Genetic structure of sigmodontine rodents (Cricetidae) along an altitudinal gradient of the Atlantic Rain Forest in southern Brazil. Marinho and Thales R.O. Freitas1,2 1Departamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil. Freitas1,2 1Departamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil. 2Departamento de Zoologia, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
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