Considered an endangered biome, the Pampa has one of the lowest percentages of legally protected areas. Furthermore, knowledge on anuran communities in this biome is still scarce. In this context, the aim of this study was to determine the composition of frogs in an area of Pampa in southern Brazil. Between January 2009 and February 2010 an inventory was conducted at the Fundação Estadual de Pesquisa Agropecuária in São Gabriel, Rio Grande do Sul. The search for specimens was held in permanent, semi-permanent and temporary ponds by survey method in breeding site. We recorded 21 species belonging to five families, which corresponds to approximately 20% of the species found in the state and 42% of the species cited for the Uruguayan Savanna ecoregion. Ten species were frequent, seven were considered common and four of them were considered rare. Three different reproductive modes were recorded, with 57% of the species using the first mode that appears to be related to the homogeneity of the area. Cluster analysis comparing the composition of anurans of four separate locations showed a greatest similarity with the municipality of Candiota (region of Campanha). These species are associated to grasslands in the state and neighbor countries, and might be considered typical from the Pampa biome.
Amphibia; cluster analysis; region of Campanha; community; southern fields
