title: Seasonal changes of water quality in a tropical shallow and eutrophic reservoir in the metropolitan region of Recife (Pernambuco-Brazil).
abstract: This study investigated the water quality in an urban eutrophic reservoir in Northeastern Brazil, considering the influence of seasonality. Monthly, samples were collected in the sub-surface reservoir. The following abiotic variables were analyzed: temperature, pH, dissolved oxygen, apparent color, turbidity, conductivity, fluoride, total nitrogen, chlorides, total dissolved solids, total hardness, iron, copper, manganese, aluminum, chlorophyll-a and phaeophytin. Total and thermotolerant coliforms were analyzed according to APHA (2012). Cyanobacteria density was quantified through its biomass. The data were analyzed using one- way ANOVA and Pearson correlation test. Higher values mean phytoplankton biomass (26.3mm3.L-1) occurred in the dry season, especially Planktothrix agardhii and Geiterinema amphibium, which occurred in 100% of samples. High trophic state index was detected throughout the year. Seasonality exerted some influence on both biotic and abiotc variables, leading to changes in water quality of the reservoir.
authors.affiliation: Companhia Pernambucana de Saneamento, (COMPESA), Laboratório de Hidrobiologia, Recife, PE, Brasil.
authors.forename: Fábio H P C
authors.initials: FH
authors.lastname: De Oliveira
authors.affiliation: Universidade Federal Rural de Pernambuco, (UFRPE), Departamento de Gastronomia, Recife, PE, Brasil.
authors.forename: André L S Capela E
authors.initials: AL
authors.lastname: Ara
authors.affiliation: Universidade Federal Rural de Pernambuco, (UFRPE), Departamento de Ciências Biológicas, Recife, PE, Brasil.
authors.forename: Cesar H P
authors.initials: CH
authors.lastname: Moreira
authors.affiliation: Fundação Nacional da Saúde (FUNASA), Laboratório de Controle da Qualidade da Água, Recife, PE, Brasil.
authors.forename: Osman O
authors.initials: OO
authors.lastname: Lira
authors.affiliation: Universidade Federal Rural de Pernambuco, (UFRPE), Departamento de Gastronomia, Recife, PE, Brasil.
authors.forename: Maria Do Rosário F
authors.initials: Mdo R
authors.lastname: Padilha
authors.affiliation: Universidade Federal Rural de Pernambuco, (UFRPE), Departamento de Gastronomia, Recife, PE, Brasil.
authors.forename: Neide K S
authors.initials: NK
authors.lastname: Shinohara
mesh_terms: D018533:Biomass; D001938:Brazil; D000458:Cyanobacteria; D004784:Environmental Monitoring; D005618:Fresh Water / Q000737:chemistry* / Q000382:microbiology*; D010839:Phytoplankton; D012621:Seasons; D060753:Water Quality