title: Organochlorine pollution in tropical rivers (Guadeloupe): role of ecological factors in food web bioaccumulation.
abstract: Concentrations of organochlorine pesticides and stable isotope ratios of nitrogen and carbon were measured in a tropical freshwater ecosystem to evaluate the contamination level of biota and examine the bioaccumulation patterns of pollutants through the food web. Chemical analyses showed a general and heavy contamination of the entire food web. They revealed the strong accumulation of pollutants by juveniles of diadromous fishes and shrimps, as they re-enter the river. The role of ecological factors in the bioaccumulation of pesticides was evaluated. Whereas the most persistent pollutants (chlordecone and monohydro-chlordecone) were related to the organisms diet and habitat, bioaccumulation of β-HCH was only influenced by animal lipid content. The biomagnification potential of chlordecone through the food chain has been demonstrated. It highlighted the importance of trophic transfer in this compound bioaccumulation process. In contrast, bioconcentration by passive diffusion from water seemed to be the main exposure route of biota to β-HCH.
authors: EA 926 DYNECAR, Laboratoire de Biologie Marine, UFR Sciences, Université des Antilles et de la Guyane, BP592, 97159 Pointe-à-Pitre Cedex, France. coatsophie@gmail.com
authors: Sophie
authors: S
authors: Coat
authors: Dominique
authors: D
authors: Monti
authors: Pierre
authors: P
authors: Legendre
authors: Claude
authors: C
authors: Bouchon
authors: Félix
authors: F
authors: Massat
authors: Gilles
authors: G
authors: Lepoint
mesh_terms: D000818:Animals; D059001:Aquatic Organisms / Q000378:metabolism*; D058448:Biota; D007631:Chlordecone / Q000032:analysis / Q000378:metabolism; D033364:Decapoda / Q000378:metabolism; D017753:Ecosystem; D004784:Environmental Monitoring; D005399:Fishes / Q000378:metabolism; D020387:Food Chain; D001556:Hexachlorocyclohexane / Q000032:analysis / Q000378:metabolism; D006843:Hydrocarbons, Chlorinated / Q000032:analysis* / Q000378:metabolism; D008800:Mexico; D008974:Mollusca / Q000378:metabolism; D010575:Pesticides / Q000032:analysis* / Q000378:metabolism; D045483:Rivers / Q000737:chemistry*; D014329:Tropical Climate; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000378:metabolism; D014877:Water Pollution, Chemical / Q000706:statistics & numerical data
chemical_list: D006843:Hydrocarbons, Chlorinated; D010575:Pesticides; D014874:Water Pollutants, Chemical; D001556:Hexachlorocyclohexane; D007631:Chlordecone; C023888:beta-hexachlorocyclohexane