Aquatic life protection index of an urban river Bacanga basin in northern Brazil, São Luís - MA

Bacanga River Basin faces environmental problems related to urbanization and discharge of untreated domestic sewage, which compromise its ecosystem health. Due to the small number of studies that assessed its water quality, the present study aimed to assess the current status of this ecosystem based...

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Bibliographic Details
Published in:Brazilian journal of biology 2017-07, Vol.77 (3), p.602-615
Main Authors: Duarte-Dos-Santos, A K, Cutrim, M V J, Ferreira, F S, Luvizotto-Santos, R, Azevedo-Cutrim, A C G, Araújo, B O, Oliveira, A L L, Furtado, J A, Diniz, S C D
Format: Article
Language:English
Subjects:
Aquatic animals
Aquatic biota
Aquatic communities
Aquatic ecosystems
Aquatic life
Aquatic Organisms
Aquatic plants
BIOLOGY
Biota
Brazil
Chlorophyll
Climate change
Conservation of Natural Resources
contamination
Dissolved oxygen
domestic sewage
Environmental impact
Eutrophication
Hazards
Household wastes
Nutrients
Quality assessment
River basins
Rivers
Sewage
Studies
Surfactants
Urbanization
Water analysis
Water Quality
Water quality assessments
Water sampling
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Summary:Bacanga River Basin faces environmental problems related to urbanization and discharge of untreated domestic sewage, which compromise its ecosystem health. Due to the small number of studies that assessed its water quality, the present study aimed to assess the current status of this ecosystem based on the aquatic life protection index. Samples were carried out every two months, in a total of six events, in six sites along the basin, where the water samples were collected to assess physicochemical parameters and calculate the trophic state index and the index of minimum parameters for the protection of aquatic communities. The data were also compared with values determined by the resolution National Environment Council - CONAMA 357/05. Our results reveal significant changes in the water quality of Bacanga River Basin. An increase in nutrients and chlorophyll-a concentration led it to eutrophication. The surfactant values were high and put in danger the aquatic biota. Dissolved oxygen rates were below the values allowed by the resolution in most sites sampled. The current water quality is terrible for the protection of aquatic life in 61.92% of the sites sampled.
ISSN:1519-6984
1678-4375
1678-4375
DOI:10.1590/1519-6984.01016