Instituto Internacional Of Ecologia E Gerenciamento Ambiental Iiega

São Carlos, Brazil

Instituto Internacional Of Ecologia E Gerenciamento Ambiental Iiega

São Carlos, Brazil

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Tundisi J.G.,Instituto Internacional Of Ecologia E Gerenciamento Ambiental Iiega | Tundisi J.G.,University Feevale | Matsumura-Tundisi T.,Instituto Internacional Of Ecologia E Gerenciamento Ambiental Iiega | Tundisi J.E.M.,Instituto Internacional Of Ecologia E Gerenciamento Ambiental Iiega | And 10 more authors.
Brazilian Journal of Biology | Year: 2015

In this paper the authors describe the limnological approaches, the sampling methodology, and strategy adopted in the study of the Xingu River in the area of influence of future Belo Monte Power Plant. The river ecosystems are characterized by unidirectional current, highly variable in time depending on the climatic situation the drainage pattern an hydrological cycle. Continuous vertical mixing with currents and turbulence, are characteristic of these ecosystems. All these basic mechanisms were taken into consideration in the sampling strategy and field work carried out in the Xingu River Basin, upstream and downstream the future Belo Monte Power Plant Units. © 2015, Instituto Internacional de Ecologia. All Rights Reserved.


Rodrigues-Filho J.L.,Instituto Internacional Of Ecologia E Gerenciamento Ambiental Iiega | Rodrigues-Filho J.L.,Progresso | Abe D.S.,Instituto Internacional Of Ecologia E Gerenciamento Ambiental Iiega | Gatti-Junior P.,Instituto Internacional Of Ecologia E Gerenciamento Ambiental Iiega | And 11 more authors.
Brazilian Journal of Biology | Year: 2015

The Xingu River, one of the most important of the Amazon Basin, is characterized by clear and transparent waters that drain a 509.685 km2 watershed with distinct hydrological and ecological conditions and anthropogenic pressures along its course. As in other basins of the Amazon system, studies in the Xingu are scarce. Furthermore, the eminent construction of the Belo Monte for hydropower production, which will alter the environmental conditions in the basin in its lower middle portion, denotes high importance of studies that generate relevant information that may subsidize a more balanced and equitable development in the Amazon region. Thus, the aim of this study was to analyze the water quality in the Xingu River and its tributaries focusing on spatial patterns by the use of multivariate statistical techniques, identifying which water quality parameters were more important for the environmental changes in the watershed. Data sampling were carried out during two complete hydrological cycles in twenty-five sampling stations. The data of twenty seven variables were analyzed by Spearman’s correlation coefficients, cluster analysis (CA), and principal component analysis (PCA). The results showed a high auto-correlation between variables (> 0.7). These variables were removed from multivariate analyzes because they provided redundant information about the environment. The CA resulted in the formation of six clusters, which were clearly observed in the PCA and were characterized by different water quality. The statistical results allowed to identify a high spatial variation in the water quality, which were related to specific features of the environment, different uses, influences of anthropogenic activities and geochemical characteristics of the drained basins. It was also demonstrated that most of the sampling stations in the Xingu River basin showed good water quality, due to the absence of local impacts and high power of depuration of the river itself. © 2015, Instituto Internacional de Ecologia. All Rights Reserved.


The weight-of-evidence - WOE approach was used to assess the environmental impact of sediments contaminated by metals in the São Francisco river and one of its tributaries, Consciência creek, both affected by anthropic activities, in the region of Três Marias (Minas Gerais/Brazil). The assessment provided support to a risk management decision. The WOE was based on bulk metal analysis, AVS-SEM assays, elutriate tests, ecotoxicity assays, benthic community assessment and a comparison for the reference area. Brazilian legislation and other available literature were used as criteria to evaluate the lines of evidence. All samples, except for the reference area, presented some contamination. However, geochemical testing for bioavailability studies showed that toxicity is unlikely as suggested by the chemical results. Ecotoxicity and benthic structure studies provided further information to support decision making. Metal acid volatile sulfide formation mechanisms were identified, which can eventually attenuate metal toxicity observed. The removal of active sources of contamination (for example, from tailings dumps) associated with Monitoring Natural Recovery could be sufficient to eventually lessen the risk of the biota in São Francisco river sediments.


Abe D.S.,Instituto Internacional Of Ecologia E Gerenciamento Ambiental Iiega | Sidagis-Galli C.,Instituto Internacional Of Ecologia E Gerenciamento Ambiental Iiega | Matsumura-Tundisi T.,Instituto Internacional Of Ecologia E Gerenciamento Ambiental Iiega | Tundisi J.E.M.,Instituto Internacional Of Ecologia E Gerenciamento Ambiental Iiega | And 3 more authors.
Brazilian Journal of Biology | Year: 2015

In this paper the authors present an additional list of aquatic macrophytes in the lower basin of the Xingu River. © 2015, Instituto Internacional de Ecologia. All Rights Reserved.

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