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O fitoplâncton e uma comunidade aquatica utilizada como bioindicador ambiental com funcao de destaque no estudo de ecossistemas aquaticos, e importante na avaliacao de mudancas no meio ambiente e no funcionamento de reservatorios. Desta forma este trabalho tem o intuito de caracterizar a flora da comunidade fitoplanctonica das bacias do Rio Sao Francisco, Moxoto e Paraiba, inseridas no Programa de Integracao do rio Sao Francisco, que compreende reservatorios e rios da regiao semiarida do Nordeste brasileiro. As coletas foram realizadas, nessas bacias, no periodo de outubro de 2011 a agosto de 2012, com frequencia trimestral. Como resultado verificou-se que a grande maioria dos parâmetros fisico-quimicos analisados, encontra-se acima do permitido pela Resolucao CONAMA 357/2005. Em relacao a comunidade fitoplanctonica, a divisao Chlorophyta apresentou o maior numero de taxons, enquanto que a Cynophyta dominou em todo o periodo de estudo, com os maiores valores de densidade. As especies Cylindrospermopsis raciborskii e Oscillatoria sp., foram dominantes em todo o periodo de estudo, o que merece atencao visto que, sao potencialmente produtoras de toxinas, podendo gerar um grave problema de saude publica. AB S T R A C T The phytoplankton community is used as a bioindicator aquatic environment with prominent role in the study of aquatic ecosystems, and important in evaluating changes in the environment and operation of reservoirs. Thus this work aims to characterize the flora of the phytoplankton community of the Sao Francisco River basin, Moxoto and Paraiba, inserted in the Integration Program of Sao Francisco River, which includes reservoirs and rivers in the semiarid region of northeastern Brazil. Samples were collected in these basins, from October 2011 to August 2012, with quarterly frequency. As a result it was found that the vast majority of physico-chemical parameters analyzed, is above that allowed by CONAMA Resolution 357/2005. Regarding the phytoplankton community, the division Chlorophyta had the highest number of taxa, while Cynophyta dominated throughout the study period, with the highest density values. The species Cylindrospermopsis raciborskii and Oscillatoria sp., Were dominant throughout the study period, which deserves attention since, are potentially produce toxins, which can generate a serious public health problem. Keywords: Phytoplankton Community; Bioindicator; Monitoring.;Physical-chemical parameters

Caracterização do Fitoplâncton das Bacias do Rio São Francisco, Moxotó e Paraíba, Inseridas no Projeto de Integração do Rio São Francisco (Characterization of Phytoplankton Basins of the São Francisco River, Moxotó and Paraíba, Inserted in the ...)