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By: Moura, Ariadne do Nascimento - Bittencourt-Oliveira, Maria do Carmo. - Dantas, Ênio Wocyli - Arruda Neto, João Dias de ToledoType: ArticleIn: Acta Botanica BrasilicaVolume:Series:Issue:Date: 2007-09-01Page Range:Publication Info:Subjects: drinking water reservoirs Northeast Brazil phytoplankton associations