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 ...)
DOI:
https://doi.org/10.26848/rbgf.v6.5.p1050-1068Keywords:
Comunidade Fitoplanctônica, Bioindicador, Monitoramento, Parâmetros Físico-Químicos.Abstract
O fitoplâncton é uma comunidade aquática utilizada como bioindicador ambiental com função de destaque no estudo de ecossistemas aquáticos, e importante na avaliação de mudanças no meio ambiente e no funcionamento de reservatórios. Desta forma este trabalho tem o intuito de caracterizar a flora da comunidade fitoplanctônica das bacias do Rio São Francisco, Moxotó e Paraíba, inseridas no Programa de Integração do rio São Francisco, que compreende reservatórios e rios da região semiárida do Nordeste brasileiro. As coletas foram realizadas, nessas bacias, no período de outubro de 2011 a agosto de 2012, com frequência trimestral. Como resultado verificou-se que a grande maioria dos parâmetros físico-químicos analisados, encontra-se acima do permitido pela Resolução CONAMA 357/2005. Em relação à comunidade fitoplanctônica, a divisão Chlorophyta apresentou o maior número de táxons, enquanto que a Cynophyta dominou em todo o período de estudo, com os maiores valores de densidade. As espécies Cylindrospermopsis raciborskii e Oscillatoria sp., foram dominantes em todo o período de estudo, o que merece atenção visto que, são potencialmente produtoras de toxinas, podendo gerar um grave problema de saúde pública. 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 São Francisco River basin, Moxotó and Paraíba, inserted in the Integration Program of São 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 parametersDownloads
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