Considerações espaciais quanto os efeitos da presença de vegetação ripária na estrutura e funcionamento de ecossistemas de riachos de Mata Atlântica

Abstract

The objective of this thesis was to evaluate the impact of land use and cover in streams, under an approach at different spatial scales. In Chapter 1 a bibliographical review on the subject was carried out in order to systematize the knowledge available in the literature on the subject. In Chapter 2 the responses of physical-chemical and biological variables to soil use and cover at different spatial scales were investigated. In Chapter 3, the responses of the community structure and functional and structural indicators of macroinvertebrate communities were evaluated to the variables that were altered by land use and cover, and evaluated which of these metrics are more susceptible to spatial autocorrelation. In chapter 4 a structural equation modeling was performed to indicate through which mechanisms the use and cover of soils affect the structural and functional variables of streams ecosystems. In Chapter 5, the impacts of an abrupt transition between land uses on environmental factors and the community of aquatic invertebrates in an Atlantic Forest creek with a nonlinear modeling approach were investigated