Ant species richness and diversity (Hymenoptera: Formicidae) in Atlantic Forest remnants in the Upper Tiete River Basin.

The objective of this study was to describe the diversity, composition and similarity of the ant fauna in seven remnants of Atlantic Forest of Upper Tiete River Basin. Two of these remnants belong to Conservation Units, four are under the protection and a fragment belongs to a private property. In each area, 50 m(2) litter samples were collected, which underwent mini-Winkler extractors, where they remained for 48 h. All collections occurred during the rainy season. In total were recorded 11 subfamilies, 44 genera and 158 morphospecies/species of ants. The most frequent species in all areas were Pheidole sp.7, Solenopsis sp.1, Hypoponera sp.1 and Strumigenys denticulata. The highest a diversity value was recorded in the conservation unit with characteristic Atlantic Forest floristic composition, the lowest value in forests with anthropogenic influence. The variation in species composition between areas indicates the replacement of species among remnants of dense rain forest of the Alto Tiete River Basin, which suggests the importance of preserving these areas for the conservation of the regional ant fauna.