Anuran diversity in an Araucaria Forest fragment and associated grassland area in a sub-tropical region in Brazil

Nathalie Edina Foerster, Carlos Eduardo Conte

Abstract


Considering the rapid advancement of forest fragmentation and habitat destruction, understanding species composition, richness and distribution is crucial for the development of conservation strategies. In this context, the main goal of this study is to provide an inventory of anuran species using different sampling methods (survey at breeding sites, transect sampling and pitfall traps) and to evaluate the assemblage structure of anurans in an Araucaria Forest and its associated grasslands in a subtropical region in Brazil. For the analyses, 21 breeding sites were classified into three categories: open area (OA; n=7), forest interior (FI; n=7) and forest edge (FE; n=7). A diversity profile analysis was performed to evaluate alpha diversity. ANOSIM and SIMPER analyses were carried out to verify differences regarding species composition (beta diversity) between the categories. A total of 33 species comprising nine families were recorded, representing ca. 80% of the estimated richness for the region. The greatest alpha diversity was observed in FI, whereas OA and FE did not differ in terms of diversity. Regarding beta diversity, all categories differed amongst themselves (dissimilarity 80%), which may be related to the presence of exclusive species in each category, requiring specific habitat characteristics, due to specific reproductive modes. Furthermore, many species showed high abundance due to their generalist habits. The presence of exclusive species at OA and FI reinforces the importance of preserving different habitats for the maintenance of local species richness and diversity.


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