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The Sinos River encompasses a wide area of natural habitats and, at the same time, supports one of the highest population densities of southern Brazil. Consequently, natural habitats along the Basin present a high degree of habitat disturbance. Despite of the existence of threatened species, information about diversity of amphibians in that area is scarce. Thus, we aimed to catalogue the amphibian species of the Sinos River Basin from records in scientific collections and compilation of published articles. We recorded 52 species, all with geographic coordinates validated at the collection point, indicating that the Sinos River Basin harbours about 50% of the amphibian species of the State of Rio Grande do Sul. Three anuran species were classified as having some degree of threat: Melanophryniscus cambaraensis, Melanophryniscus dorsalis and Thoropa saxatilis. We also expected other 18 species with a high probability of occurrence in the Basin. This work shows that, despite the intense human impact, the Sinos River Basin has a relevant role for the maintenance of a considerable fraction of the amphibian biodiversity in southern Brazil. [ABSTRACT FROM AUTHOR]

The article offers a study of the taxonomic identification and intrageneric chromosome number variation in Pseudopaludicola frogs. It says that the karyotypes of P. falcipes have 2n = 22 chromosomes, while P. ameghini and P. ternetzi consisted 2n = 20. It suggests that the karyotypic patterns in P. ameghini indicate a distinction from P. mystacalis with 2n = 16 chromosomes.

The article explores the spatial and temporal distribution of Pseudis minuta and the role of environmental factors in its reproduction in Reserva Biológica do Lami, Porto Alegre, southern Brazil. There were significant differences in border distance and water depth among age-sex classes of Pseudis minuta. No significant difference was found in the presence of calling males and non-calling males in relation to monthly relative humidity but opposite was noted in relation to total monthly rainfall, mean monthly air temperature and water temperature. The number of females was related with daily air temperature, relative humidity and water temperature.