Ecologia de insetos aquáticos em córregos do Cerrado: do nicho hutchinsoniano ao distúrbio intermediário

• Autor(a) principal: GODOY, Bruno Spacek
• Data de Publicação: 2010
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tde/2637
• topic: Inferência Bayesiana; EPT; Impactos ambientais; Bayesian inference; EPT; Enviromental impacts; CNPQ::CIENCIAS BIOLOGICAS::ECOLOGIA

The Cerrado region is the second largest biome in Brazil, covering nearly 22% of the national territory. Due to a facility provided this biome for handling and cultivating the soil, the Cerrado has been suffering an intense change in its landscape, increasing the impact in all it s natural systems. Thru a systemized sampling of 101 streams in the Rio das Almas River Basin region, center of Goias, it was observed how such change in landscape changes the community of benthonic water insects. Initially it was not observed changes in the number of genres for different river sizes. Impact raise, especially in the riparian zone leads to a reduction in the number of genres of Ephemeroptera, Plecoptera and Trichoptera. The communities in impacted streams are subsets of communities in pristine localities, showed a nestedness pattern. Despite the number of genres reduction in impacted locations, the expected richness expressed by the sum of the probability of genre occurrence in certain integrity value, is larger in preserved and degraded locations. Therefore, the genre substitution rate tends to be larger in very impacted and well preserved areas. The environmental matrix of the Cerrado is composed largely of already impacted areas, which explains this large number or genres that live in degraded locations thru simple area effect. Ultimately, we compared the results of two indexes used for ecological monitoring proposes of streams, that aim to observe different impacts in the environment. There was no relation between the Index of Habitat Integrity and an index that measures the pollution in the water (BMPW ), indicating that there is a need to use the two together for an effective monitoring.