title: Evaluation of surface water quality using an ecotoxicological approach: a case study of the Piracicaba River (São Paulo, Brazil).
abstract: A long-term study was conducted to evaluate Piracicaba River water (São Paulo state, Brazil) using different methodologies and organisms. During 1 year (February 2011 to January 2012), water samples were collected monthly at six different locations and exposed under laboratory conditions to the microcrustaceans Ceriodaphnia dubia and Ceriodaphnia silvestrii for 7 days and to the fish Danio rerio for 4 days to evaluate effects on reproduction and on gill morphology, respectively. Physical-chemical parameters of the water were also measured. Physical-chemical characteristics demonstrated decreasing water quality from upstream to downstream of the river. Effects on the reproduction of C. dubia and C. silvestrii were observed in 3 months (February and March 2011 and January 2012) and occurred in samples collected close to industrialized cities like Americana and Piracicaba. Evaluation of the gills showed normal function of the organ during all months, except in February, September, and October for some locations.
authors.affiliation: Laboratório de Ecotoxicologia Aquática, Centro de Energia Nuclear na Agricultura, Universidade de São Paulo-CENA/USP, Avenida Centenário, 303, 13416-000 São Dimas, Piracicaba, SP, Brazil. rbotelho@cena.usp.br
authors.forename: R G
authors.initials: RG
authors.lastname: Botelho
authors.forename: M L
authors.initials: ML
authors.lastname: Rossi
authors.forename: L A
authors.initials: LA
authors.lastname: Maranho
authors.forename: R A
authors.initials: RA
authors.lastname: Olinda
authors.forename: V L
authors.initials: VL
authors.lastname: Tornisielo
mesh_terms: D000818:Animals; D001938:Brazil; D055598:Chemical Phenomena; D002947:Cities; D033361:Cladocera / Q000187:drug effects; D054750:Ecotoxicology / Q000379:methods*; D004784:Environmental Monitoring / Q000379:methods*; D005618:Fresh Water / Q000032:analysis / Q000737:chemistry; D005880:Gills / Q000187:drug effects / Q000473:pathology; D045483:Rivers / Q000737:chemistry*; D036401:Toxicity Tests, Chronic; D014874:Water Pollutants, Chemical / Q000009:adverse effects / Q000032:analysis / Q000737:chemistry*; D060753:Water Quality / Q000592:standards*; D015027:Zebrafish
chemical_list: D014874:Water Pollutants, Chemical