Influence of the Amazon Hydrological Regime on Eutrophication Indicators of a Hydroelectric Power Plant Reservoir

• Published in: Bulletin of environmental contamination and toxicology Vol. 98; no. 5; pp. 677 - 681
• Main Authors: Freire, Jean Carlos A., Hauser-Davis, Rachel Ann, da Costa Lobato, Tarcísio, de Morais, Jefferson M., de Oliveira, Terezinha F., F. Saraiva, Augusto Cesar
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.05.2017; Springer Nature B.V
• Subjects: Ammonium Compounds - analysis; Anthropogenic factors; Aquatic Pollution; Brazil; Earth and Environmental Science; Ecotoxicology; Environment; Environmental changes; Environmental Chemistry; Environmental Health; Environmental impact; Environmental management; Environmental Monitoring - methods; Eutrophication; Hydroelectric plants; Hydroelectric power; Hydrogen-Ion Concentration; Hydrologic analysis; Hydrologic cycle; Hydrologic regime; Land use; Nitrates - analysis; Phosphates - analysis; Pollution; Power Plants; Reservoirs; Soil Science & Conservation; Temperature; Trophic status; Turbidity; Waste Water Technology; Water Management; Water Pollutants, Chemical - analysis; Water Pollution Control; Water Quality; Water Resources; Amazon Basin; Eutrophication parameters; Hydrological regime; Amazon reservoir
• ISSN: 0007-4861; 1432-0800
• DOI: 10.1007/s00128-017-2030-9

Dam constructions in the Amazon have increased exponentially in the last decades, causing several environmental impacts and serious anthropogenic impacts in certain hydroelectric power plant reservoirs in the region have been identified. The assessment of the trophic status of these reservoirs is of interest to indicate man-made changes in the environment, but must take into account the hydrological cycle of the area. This can be relevant for environmental management actions, aiding in the identification of the ecological status of water bodies. In this context, physico-chemical parameters and eutrophication indicators were determined in a hydroelectric power plant reservoir in the Brazilian Amazon to assess trophic variations during the regional hydrological regime phases on the reservoir, namely dry, filling, full and emptying stages. The local hydrological regimes were shown to significantly influence TSS and turbidity, as well as NH 4 , NO 3 , PO 4 , with higher values consistently observed during the filling stage of the reservoir. In addition, differences among the sampling stations regarding land use, population and anthropogenic activities were reflected in the PO 4 3− values during the different hydrological phases.