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      Organochlorine pollution in tropical rivers (Guadeloupe): role of ecological factors in food web bioaccumulation.

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          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.

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          Author and article information

          Journal
          Environ. Pollut.
          Environmental pollution (Barking, Essex : 1987)
          Elsevier BV
          1873-6424
          0269-7491
          Jun 2011
          : 159
          : 6
          Affiliations
          [1 ] 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
          Article
          S0269-7491(11)00110-2
          10.1016/j.envpol.2011.02.036
          21440344
          36afcefd-7e22-4cf6-9d9e-1bcfbe41a614
          History

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