O processo de colonização por macrófitas aquáticas em reservatórios da bacia hidrográfica do rio Tocantins

Abstract

Considering the increasing number of aquatic vegetation in disturbed environments by forming reservoirs, this study analyzes information available in the literature and in monitoring of hydropower projects documents in order to investigate the evolution studies on aquatic macrophytes and the possibility of using the data available for the succession in new reservoirs in the watershed Rio Tocantins prediction process. The study was conducted through a literature review, including documentary research. In the case of this work dealt with the documentary research data already processed, seeking information in the EIA / RIMA, the monitoring of each hydroelectric project, in books, journals, loose publications, specialist websites, print media and electronically available on the Internet or in libraries. In the first chapter studies indicate that monitoring, particularly within the Operating Permit, are not being implemented satisfactorily, falling short in several aspects needed and important to a survey, analysis and comparison of this information. In the second chapter the results show that the species of aquatic weeds: Salvinia auriculata, Cyperus spp, Oxycaryum cubenses and Najas microcarpa, were the pioneers in the reservoirs monitored the Tocantins River Basin. Also showed that the ecological types tend to differentiate themselves from the river stage for the reservoir phase, while in the river stage dominated emerging in the reservoir phase space sampling areas for free-floating, submerged, and were giving epiphytes. Thus the systematic monitoring of the process contributes to the development of models to predict the occurrence of macrophytes in reservoirs or other planned initial construction phase.