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Six lakes/lagoons of the North Coast of Rio Grande do Sul state and the Tramandaí-Armazém estuarylagoon complex were selected in this study. The objective was to provide basic information for ecosystem management, through the relationships between spatial-temporal variations of the zooplankton community and water quality. Samplings were performed at seventeen points along this system during autumn, winter and spring of 1996. Besides the zooplankton analysis, water samples were taken to analyze the physiochemical variables used in the water quality index (WQI) set up by the National Sanitation Foundation (NSF). The WQI values usually decreased seasonally from N→S, towards the estuary, showing a spatial gradient. Approximately 87 species constituted the zooplankton community richness. Dominance of the microzooplankton (protists and rotifers) in the community was characteristic for this system, with indicator species of the environmental variations. Rotifer species were indicative of WQI spatial variations during the autumn (Brachionus calyciflorus) and winter (Keratella tropical), while ciliate species were indicative during the spring (Tintinnidium sp2.). Key-words: zooplankton, coastal lakes and lagoons, WQI, South of Brazil.

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Relações do Índice de Qualidade de Água (IQA) com a Variação Temporal e Espacial da Comunidade Zooplanctônica do Sistema Lagunar de Tramandaí (Litoral Norte do Rio Grande do Sul - RS Brasil)