Preditores da diversidade beta de adultos de Odonata (insecta) na Amazônia brasileira

Abstract

The general objective of the dissertation was to evaluate the beta diversity of Odonata adults based on the contribution of species (SCBD) and sites (LCBD). In addition to analyzing which environmental predictors are responsible for the variation of species composition. We collected biotic and abiotic variables in 117 streams in the eastern region of the Brazilian Amazon. All analyzes were performed separately for the order (Odonata) and suborders (Anisoptera/Zygoptera). We collected 4,187 individuals distributed among 156 species. Fifty-three sites had a high contribution to Odonata diversity. Forty-two sites contributed above average to Anisoptera diversity and fifty-four sites to Zygoptera. Forty species contributed above average to the diversity of Odonata. Since the Zygoptera species presented a greater contribution to the diversity than the Anisoptera species. The Odonata community was not influenced by any of the environmental variables analyzed. However, Anisoptera diversity was determined by dissolved oxygen and habitat integrity (HII). E of Zygoptera was determined by depth, water temperature, pH and HII. Our results suggest substituting sensitive species for species tolerant to environmental changes, due to the suborders having presented opposite responses to the gradient of habitat integrity. The integrity of the habitat is closely related to the structure of the Odonata community, especially that of the suborders. This relationship makes it possible to generate predictions about the processes that structure and maintain the community.