title: Aquatic life protection index of an urban river Bacanga basin in northern Brazil, São Luís - MA.
abstract: 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.
authors.affiliation: Laboratório de Ficologia - LABFIC, Departamento de Oceanografia e Limnologia - DEOLI, Universidade Federal do Maranhão - UFMA, Av. dos Portugueses, 1966, Bacanga, CEP 65080-805, São Luís, MA, Brazil.
authors.forename: A K
authors.initials: AK
authors.lastname: Duarte-Dos-Santos
authors.affiliation: Laboratório de Ficologia - LABFIC, Departamento de Oceanografia e Limnologia - DEOLI, Universidade Federal do Maranhão - UFMA, Av. dos Portugueses, 1966, Bacanga, CEP 65080-805, São Luís, MA, Brazil.
authors.forename: M V J
authors.initials: MVJ
authors.lastname: Cutrim
authors.affiliation: Laboratório de Ficologia - LABFIC, Departamento de Oceanografia e Limnologia - DEOLI, Universidade Federal do Maranhão - UFMA, Av. dos Portugueses, 1966, Bacanga, CEP 65080-805, São Luís, MA, Brazil.
authors.forename: F S
authors.initials: FS
authors.lastname: Ferreira
authors.affiliation: Laboratório de Ficologia - LABFIC, Departamento de Oceanografia e Limnologia - DEOLI, Universidade Federal do Maranhão - UFMA, Av. dos Portugueses, 1966, Bacanga, CEP 65080-805, São Luís, MA, Brazil.
authors.forename: R
authors.initials: R
authors.lastname: Luvizotto-Santos
authors.affiliation: Laboratório de Biologia Vegetal e Marinha - LBVM, Departamento de Química e Biologia - DQB, Universidade Estadual do Maranhão - UEMA, Cidade Universitária Paulo VI, s/n, Tirirical, CEP 65055-000, São Luís, MA, Brazil.
authors.forename: A C G
authors.initials: ACG
authors.lastname: Azevedo-Cutrim
authors.affiliation: Laboratório de Ficologia - LABFIC, Departamento de Oceanografia e Limnologia - DEOLI, Universidade Federal do Maranhão - UFMA, Av. dos Portugueses, 1966, Bacanga, CEP 65080-805, São Luís, MA, Brazil.
authors.forename: B O
authors.initials: BO
authors.lastname: Araújo
authors.affiliation: Laboratório de Ficologia - LABFIC, Departamento de Oceanografia e Limnologia - DEOLI, Universidade Federal do Maranhão - UFMA, Av. dos Portugueses, 1966, Bacanga, CEP 65080-805, São Luís, MA, Brazil.
authors.forename: A L L
authors.initials: ALL
authors.lastname: Oliveira
authors.affiliation: Laboratório de Ficologia - LABFIC, Departamento de Oceanografia e Limnologia - DEOLI, Universidade Federal do Maranhão - UFMA, Av. dos Portugueses, 1966, Bacanga, CEP 65080-805, São Luís, MA, Brazil.
authors.forename: J A
authors.initials: JA
authors.lastname: Furtado
authors.affiliation: Laboratório de Ficologia - LABFIC, Departamento de Oceanografia e Limnologia - DEOLI, Universidade Federal do Maranhão - UFMA, Av. dos Portugueses, 1966, Bacanga, CEP 65080-805, São Luís, MA, Brazil.
authors.forename: S C D
authors.initials: SCD
authors.lastname: Diniz
mesh_terms: D059001:Aquatic Organisms; D001938:Brazil; D003247:Conservation of Natural Resources; D014507:Urbanization; D060753:Water Quality