Anuros de serrapilheira em diferentes fitofisionomias na Floresta Ombrófila Mista, Rio Grande do Sul, Brasil

Abstract

Anuran amphibians are animals that most directly respond to environmental changes, in virtue of its peculiar physiological characteristics. In this study, we provided the first data on a community of litter anurans in the state of Rio Grande do Sul. objective was to verify the influence of phytophysiognomy on the composition of the in three different environments (Araucaria, Nativa and Pinus) in the Ombrophilous Forest Mixed and was carried out in the National Forest of Passo Fundo (FLONA). We use pitfall traps for collecting anurans and invertebrates (evaluated for the availability of food for anurans). We collect monthly litter collections for the evaluation of dry biomass and record of climatic variables (relative humidity, precipitation rainfall and temperature). We evaluated the diversity of anurans between phytophysiognomies and influence of independent variables (litter biomass, richness and abundance of invertebrates, rainfall, humidity and temperature) on abundance, richness and biomass of anurans through simple linear regressions. We sampled 311 individuals from nine species of anurans, with greater abundance and richness in the native area, although these results were statistically significant. Our results showed that it would be necessary to increase in the sample effort, because according to the species rarefaction curve, there are still species of litter anurans to be recorded. The abundance and richness of invertebrates were associated with the anurans' richness only in the phytophysio- araucaria. Dry litter biomass had no influence on the anurans community and was lower in native compared to other areas. Rainfall and humidity influenced the abundance of anurans, while temperature influenced wealth. All variables presented seasonal pattern, with higher values ​​in the hot season. Our results demonstrated that habitat change influenced the litter anurofauna.