Organochlorine pollution in tropical rivers (Guadeloupe): Role of ecological factors in food web bioaccumulation
2011
Coat, Sophie | Monti, Dominique | Legendre, Pierre | Bouchon, Claude | Massat, Félix | Lepoint, Gilles
Direction Régionale de l’Environnement de la Guadeloupe
Afficher plus [+] Moins [-]Centre Interfacultaire de Recherches en Océanologie - MARE
Afficher plus [+] Moins [-]Concentrations of organochlorine pesticides and stable isotope ratios of nitrogen and carbon weremeasured in a tropical freshwater ecosystem to evaluate the contamination level of biota and examinethe bioaccumulation patterns of pollutants through the food web. Chemical analyses showed a generaland heavy contamination of the entire food web. They revealed the strong accumulation of pollutants byjuveniles of diadromous fishes and shrimps, as they re-enter the river. The role of ecological factors in thebioaccumulation of pesticides was evaluated. Whereas the most persistent pollutants (chlordecone andmonohydro-chlordecone) were related to the organisms diet and habitat, bioaccumulation of b-HCH wasonly influenced by animal lipid content. The biomagnification potential of chlordecone through the foodchain has been demonstrated. It highlighted the importance of trophic transfer in this compound bioaccumulationprocess. In contrast, bioconcentration by passive diffusion from water seemed to be themain exposure route of biota to b-HCH.
Afficher plus [+] Moins [-]Linked papers: Coat et al. 2009 and Lefrançois et al. 2010
Afficher plus [+] Moins [-]Mots clés AGROVOC
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