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Benthic macroinvertebrates indicate loss of water quality in a urban influenced area of Río Negro (Uruguay). River systems are subject to strong anthropogenic pressure that affects their water quality and biodiversity. The Río Negro is the largest inland river in Uruguay. It crosses the country from east to west after being born in Brazil. It receives the effluents from some cities such as Paso de los Toros and it drains a basin with agricultural, livestock and forestry uses. The National Environment Directorate has been monitoring the water quality of the Río Negro since 2009 with results that indicate an acceptable quality throughout the course (except for phosphorus). Nevertheless, the river captures from their small tributaries, mainly organic matter and domestic effluents from the cities located on the main courses. The present study seeks to assess the urban impact and the self-purification capacity of the river by comparing the benthic macroinvertebrates communities upstream (control) and downstream Paso de Los Toros city (pollution and self-purification) zones.

MACROINVERTEBRADOS BENTONICOS INDICAN EMPEORAMIENTO DE LA CALIDAD DE AGUA EN UNA ZONA DE INFLUENCIA URBANA EN EL RÍO NEGRO