title: Detoxification and recovery capacities of Corbicula fluminea after an industrial metal contamination (Cd and Zn): a one-year depuration experiment.
abstract: This study aimed to assess the recovery capacity of the freshwater bivalve Corbicula fluminea subjected to industrial metal discharges (Cd, Zn). After a 24-day exposure in a metal-contaminated river, bivalves were transferred and maintained in the laboratory for one year under metal-free conditions. Metal accumulation, metallothionein production and genetic expressions of genes involved in metal stress were studied. Results demonstrated the high persistence of Cd in tissues (only 73% eliminated after 365 days) whereas Zn was rapidly depurated. The Cd half-life was estimated around 240 days. Metallothioneins were strongly induced within the 28 first days of decontamination, then decreased by 45% after 365 days. The metal exposure of bivalves led to a significant gene induction. After 28 days, most of the genes were no longer overexpressed, suggesting that the bivalves may withstand small amounts of non-essential metals in their tissues without showing signs of detrimental effects on the tested genes.
authors.affiliation: University of Bordeaux 1, UMR CNRS 5805 EPOC, Place du Docteur Peyneau, 33120 Arcachon, France.
authors.forename: A
authors.initials: A
authors.lastname: Arini
authors.affiliation: CNRS, EPOC, UMR 5805, 33405 Talence, Cedex, France.
authors.forename: G
authors.initials: G
authors.lastname: Daffe
authors.affiliation: CNRS, EPOC, UMR 5805, 33405 Talence, Cedex, France.
authors.forename: P
authors.initials: P
authors.lastname: Gonzalez
authors.affiliation: University of Bordeaux 1, UMR CNRS 5805 EPOC, Place du Docteur Peyneau, 33120 Arcachon, France.
authors.forename: A
authors.initials: A
authors.lastname: Feurtet-Mazel
authors.affiliation: University of Bordeaux 1, UMR CNRS 5805 EPOC, Place du Docteur Peyneau, 33120 Arcachon, France. Electronic address: m.baudrimont@epoc.u-bordeaux1.fr.
authors.forename: M
authors.initials: M
authors.lastname: Baudrimont
mesh_terms: D000818:Animals; D049872:Bivalvia / Q000378:metabolism; D002104:Cadmium / Q000032:analysis / Q000633:toxicity*; D049874:Corbicula / Q000378:metabolism / Q000502:physiology*; D006207:Half-Life; D008658:Inactivation, Metabolic / Q000502:physiology*; D008668:Metallothionein / Q000378:metabolism; D045483:Rivers; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000633:toxicity*; D015032:Zinc / Q000032:analysis / Q000633:toxicity*
chemical_list: D014874:Water Pollutants, Chemical; D002104:Cadmium; D008668:Metallothionein; D015032:Zinc
keywords: Cadmium; Corbicula fluminea; Depuration; Gene expression; Metallothionein; Zinc