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Evaluation of water and sediment quality of urban streams in Santa Cruz do Sul County, RS, Brasil, using ecotoxicological assays/Avaliação da qualidade da água e sedimento de arroios urbanos no município de Santa Cruz do Sul, RS, Brasil, utilizando ensaios ecotoxicológicos
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Evaluation of water and sediment quality of urban streams in Santa Cruz do Sul County, RS, Brasil, using ecotoxicological assays/Avaliação da qualidade da água e sedimento de arroios urbanos no município de Santa Cruz do Sul, RS, Brasil, utilizando ensaios ecotoxicológicos
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Evaluation of water and sediment quality of urban streams in Santa Cruz do Sul County, RS, Brasil, using ecotoxicological assays/Avaliação da qualidade da água e sedimento de arroios urbanos no município de Santa Cruz do Sul, RS, Brasil, utilizando ensaios ecotoxicológicos
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Journal Article
Evaluation of water and sediment quality of urban streams in Santa Cruz do Sul County, RS, Brasil, using ecotoxicological assays/Avaliação da qualidade da água e sedimento de arroios urbanos no município de Santa Cruz do Sul, RS, Brasil, utilizando ensaios ecotoxicológicos
2014
Overview
This study aimed to assess the quality of water and sediment of urban streams located in Santa Cruz do Sul County, RS, Brazil, using the microcrustacean Ceriodaphnia dubia as test-organism. Quarterly scientific excursions to the streams were held on August and November 2011, February and May of 2012 in order to collect water and sediment samples, in the upper reaches and lower reaches, totalizing 8 points. To evaluate the toxicity, the microcrustacean C. dubia was used. The results indicated high toxicity levels detected in samples P2, P6 and P8, as they caused the mortality of 100% of organisms in the water samples and sediment samples, denoting acute effect. Yet, all upstream sites showed chronic effects in sediment samples, at least for one collection period, with the highest significant toxicity level among all samples, which indicates the presence of contamination even in upper areas.
Publisher
Associação Brasileira de Limnologia
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