Integrated analysis of water quality from two rivers used for public supply in south Brazil

Flávia Bernado Chagas, Camila Fátima Rutkoski, Gregori Betiato Bieniek, Gean Delise Leal Pasquali Vargas, Gregori Betiato Bieniek, Paulo Afonso Hartmann, Marilia Teresinha Hartmann

Resumo


Abstract: Aim: This study aimed to evaluate the water quality of streams that are used for public supply, through an integrated analysis using a biotic index, as well as physicochemical and microbiological parameters. Methods: The data were obtained monthly, from November 2014 to April 2015, at eight locations in two rivers in the south of Brazil. The landscape is predominantly rural, with the occurrence of small reforested areas, as well as yerba mate and grape cultivations. Macroinvertebrate samples were collected monthly using a Surber sampler. Water temperature and dissolved oxygen concentration were measured in the field using a portable oximeter. The following parameters were measured in the laboratory: pH, Turbidity, BOD, Conductivity and Nitrate. Results: The evaluation carried out in the rivers showed good water, but some sample sites presented decreasing water quality. The waters of the Leãozinho River were classified as doubtful in site 1 and as good in sites 2, 3 and 4. Ligeirinho River presented an acceptable rating in sites 1 and 4 and was classified as good in sites 2 and 3. The BMWP' showed significant correlation with the abundance of organisms and richness of EPT, and no significant correlation with abiotic parameters. The abundance of macroinvertebrates in Leãozinho and Ligeirinho Rivers was not strongly influenced by the physical, chemical and microbiological parameters evaluated, and was weakly defined by dissolved oxygen, conductivity, water temperature, pH, turbidity, total coliforms, fecal coliforms, BOD and nitrate. The richness of macroinvertebrates in Leãozinho and Ligeirinho Rivers was more strongly influenced by conductivity and dissolved oxygen. Conclusion: This study reinforces the importance of biomonitoring in the evaluation of water quality for human consumption, considering that environmental management and monitoring practices should integrate physicochemical, microbiological and biological parameters.


Palavras-chave


macroinvertebrates; BMWP’; physicochemical parameters; human consumption



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