Biodiversity under rocks in disturbed habitats: the role of microhabitats in landscape heterogeneity and community maintenance

摘要: The construction of reservoirs for electric power generation is becoming a frequent action in Brazil. In these modified environments, the water level suffers seasonal and stochastic oscillations. difference among maximum minimum levels forms depletion zone, which oscillations represent disturbance installed communities. Analyzing 30 shelters zone Tres Marias Reservoir, we aimed to evaluate richness diversity associated communities verify relationship between shelter’s area, distance from water, concentration organic matter humidity communities’ traits. We collected 183 individuals distributed 64 morfo-species 33 families orders Acarina, Araneida, Scorpionida, Lithobiomorpha, Scolopendromorpha, Coleoptera, Collembola, Dermaptera, Dictyoptera, Diptera, Ensifera, Homoptera, Hymenoptera, Lepidoptera, Zygentoma. Araneida was richest order (40.4%), represented mainly by Salticidae Theridiidae. Hymenoptera (18%) Diptera (13.1%) were abundant. Nearly 68% species are predators, others basically scavengers. Most (73%) use more than shelter obtaining resources. similarity varied 0 0.5, most presented values less 0.3. Soil moisture significantly related also matter. No correlation observed physical biological variables. Shelters seem be important reservoir, offering conditions resources that make permanence possible strongly area subject disturbances.