Uptake and elimination of hydrophobic organic contaminants in estuarine copepods: An experimental study

Authors

  • Kévin Cailleaud,

    1. Université Bordeaux 1, CNRS, ISM-LPTC-UMR 5255, 351 cours de la Libération, 33405 Talence, France
    2. Université des Sciences et Technologies de Lille—Lille 1, UMR CNRS 8187 LOG, Station Marine de Wimereux, 28 avenue Foch, 62930 Wimereux, France
    3. Université du Havre, LEMA-UPRES EA3222, GDR IMOPHYS, 25 rue Philippe Lebon, 76058 Le Havre, France
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  • Hélène Budzinski,

    1. Université Bordeaux 1, CNRS, ISM-LPTC-UMR 5255, 351 cours de la Libération, 33405 Talence, France
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  • Karyn Le Menach,

    1. Université Bordeaux 1, CNRS, ISM-LPTC-UMR 5255, 351 cours de la Libération, 33405 Talence, France
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  • Sami Souissi,

    1. Université des Sciences et Technologies de Lille—Lille 1, UMR CNRS 8187 LOG, Station Marine de Wimereux, 28 avenue Foch, 62930 Wimereux, France
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  • Joëlle Forget-Leray

    Corresponding author
    1. Université du Havre, LEMA-UPRES EA3222, GDR IMOPHYS, 25 rue Philippe Lebon, 76058 Le Havre, France
    • Université du Havre, LEMA-UPRES EA3222, GDR IMOPHYS, 25 rue Philippe Lebon, 76058 Le Havre, France
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Abstract

Polycyclic aromatic hydrocarbons (PAHs) are considered to be rapidly biotransformed by organisms, whereas poly-chlorinated biphenyls (PCBs) are strongly bioaccumulated. In the present study, the estuarine copepod Eurytemora affinis was exposed in a continuous flow-through system to dissolved PAH (500 ng/L) and PCB (300 ng/L) mixtures for 86 h, whereas control groups were placed in a continuous flow-through system with clean water. Both PCB and PAH body residues were measured and compared in exposed and in nonexposed copepods to assess the uptake and the elimination of these two contaminant classes in this copepod species. After the exposure, exposed copepods exhibited concentration factors, based on a dry-weight basis, of 25, 750, and 1,200, respectively, for total PCBs and PAHs. The lower concentrations of PAHs in the nonexposed versus exposed copepods in contrast to small differences for PCBs suggest a higher rate of metabolism of PAHs compared with PCBs and could explain the differences observed in the accumulation. Furthermore, uptake as well as elimination of both PCBs and PAHs were compound selective in E. affinis. Therefore, higher-molecular-weight PCBs and PAHs were preferentially accumulated, while lower-molecular-weight compounds were preferentially eliminated. These results suggest the importance of copepods in the biogeochemical cycles of hydrophobic organic contaminants in estuarine ecosystems.

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