QUALIDADE DA ÁGUA COMO REFLEXO DE ATIVIDADES ANTRÓPICAS EM BACIAS HIDROGRÁFICAS DO NORDESTE, BRASIL.

Water sustainability establishes a key factor for human group development. This study aimed to verify the anthropic activities influence through the Water Quality Index (WQI), Trophic State Index (TSI), Recreational Water Quality Index (RWQI) and Phytoplankton Community Index (PCI) for water quality at São Francisco, Paraíba, Pajeú and Moxotó river basins stretches. Information were provided by Brazilian National Integration Ministry concerning to biannual samplings during 2013/2014. pH, turbidity, dissolved oxygen, fecal coliform, COD, total phosphorus and chlorophyll-a variables showed results outside the limits established by CONAMA Resolution 357/2005 for class II waters. These results showed a human influence on the water quality of rivers and reservoirs assessed, and they will be served as a support for future research development for water ecosystems management at Brazilian semiarid region. [ABSTRACT FROM AUTHOR]