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The semi-arid region is characterized by irregular distribution of rainfall and is exposed to long periods of drought. With this, spaces destined to dam water like dams (reservoirs and dams) are constructed to guarantee its multiple uses, especially in periods of drought. In these environments the environmental degradation of anthropic origin occurs, causing a change in the water quality. And the development of phytoplankton as well as that of aquatic plants is related to eutrophication. The aim of this study was to determine the composition of planktonic chlorophytes from the Rosário Reservoir, located in the municipality of Lavras da MangabeiraCE, aiming to contribute to the knowledge of the algal microflora, as well as to characterize the dynamics of these organisms in the ecosystem in which they are found. The samples were obtained through a plankton network (20 μm), stored, fixed with formal to 4% and transported to the Botanic Laboratory of the Regional University of Cariri (LaB/URCA), where the identification steps were carried out.The composition of planktonic chlorophyceae was represented by 40 taxa, which were distributed in four taxonomic classes, six orders and 11 families.The Chlorophyceae family was the most representative with 27 taxa, followed by Zygnemaphyceae with 11, Chlamydophyceae and Oedogoniophyceae with one taxon each. Among the taxa identified, they present ecological habits for nutrient rich environments, signaling the need for monitoring, and it is important to study the microalgae to understand the functioning of aquatic ecosystems, since they are considered bioindicators of water quality.

MICROALGAS PLANCTÔNICAS (CLOROFÍCEAS) COMO BIOINDICADORAS DA QUALIDADE DA ÁGUA EM RESERVATÓRIO DO SEMIÁRIDO CEARENSE