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Analysis of the seasonal variation of the physical and chemical characteristics of the water of the Roosevelt River, Amazonas, Brazil

The goal of this work was to perform preliminary surveys over the abiotic factors of Roosevelt river, Amazonas, Brazil in four different periods: rising, flood, lowing, and dry. Four sites were monitored: P1, P2, P3 and P4. There were measured: depth, water transparency, conductivity, pH, surface water temperature and dissolved oxygen. Results showed a seasonality at the four sampling stations. The conductivity always showed high values in the flood at all sampling stations, except for P4. The pH showed low variation in all periods and sampling stations. Only depth and transparency were significant in P2. We conclude that studies are required that indicate the potential causes of conductivity variation: autochthonous or human activities. The explanation of the conductivity source is necessary since the studied area is located near a conservation area.