Data/hora: 11/06/2024 14:45:10

Provedor de dados: | Brazilian Archives of Biology and Technology
País: | Brazil
Título: | Trophic state and microorganisms community of major sub-basins of the middle Rio Doce basin, southeast Brazil
Autores: | Petrucio,Mauricio Mello; Medeiros,Adriana Oliveira; Rosa,Carlos Augusto; Barbosa,Francisco Antônio Rodrigues.
Data: | 2005-07-01
Ano: | 2005
Palavras-chave: | Microorganisms; Phosphorus; Rivers; Trophic state.
Resumo: | Total phosphorus concentration was used to define the trophic state of the main sub-basins of the middle Rio Doce, in Minas Gerais State (southeast Brazil) and physical, chemical, and microbiological variables of water were analyzed during 2000 to 2001. The study evaluated changes in water quality caused by seasonality and human activities. Water temperature, conductivity, pH, total alkalinity, dissolved oxygen, and concentrations of NH4-N, NO2-N, NO3-N, total-N, PO4-P, total-P, DOC, and chlorophyll-a were measured in seven rivers stretches (sampling stations). Total yeasts, faecal and total coliforms, and heterotrophic bacteria were also determined. The studied areas were considered to be under oligotrophic to eutrophic conditions. The variables that presented highest positive correlation with faecal coliforms were total-P and total-N, and heterotrophic bacteria density was identified as a good parameter to differentiate the ecosystems. These results suggested the inclusion of the trophic level and the distinct activities within a watershed as important elements when proposing conservation and restoration areas.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000500015
Editor: | Instituto de Tecnologia do Paraná - Tecpar
Relação: | 10.1590/S1516-89132005000500015
Formato: | text/html
Fonte: | Brazilian Archives of Biology and Technology  v.48 n.4 2005
Fonte: | info:eu-repo/semantics/openAccess