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Year : 2002
Tome : 153
Volume : 6
Pages : 425-432
Title : Contaminants in marine foodwebs
Authors : A. ABARNOU, V. LOIZEAU, A.-M. LE GUELLEC and A. JAOUEN-MADOULET
Summary : The occurrence of organic contaminants in the environment raises important questions on their fate in trophic chains and thus on the exposition of end consumers to such potentially harmful substances. This brief presentation of our studies begins with results obtained within the french marine monitoring programme whose main objectives are the evaluation of status and trends of contaminants. Examples are given for PCBs for which higher contamination level are measured close to estuaries in relation with large inputs from their whole catchment area. During last decade, decreasing trends of the contamination are observed in most situations, similar improvements have been also observed in other developed countries, at least for organic contaminants which are commonly monitored. The bioaccumulation model is presented; it has been validated for PCBs in the seabass foodweb in the Seine estuary and relies upon detailed biological functions of the various species and the appropriate parameterisation of these functions. The model demonstrates the importance of food as a major source of contamination for higher consumers. The improvement of the model and its use in the case of less persistent compounds requires further studies in order to take into account biotransformation. At last, recent results are given concerning the contamination dioxins (PCCDs/Fs) and dioxin-like PCBs ; it appears that this group of dioxin-like contribute the most to the dioxin toxicity.
Keywords : PCBs - PAHs - dioxins - foodweb - monitoring - bioaccumulation model - Seine.
Correspondence : A. ABARNOU
Adress : FREMER, Centre de Brest, B.P. 70, F-29280 Plouzan, Direction de lEnvironnement et de lAmnagement du Littoral, Dpartement dcologie Ctire e-mail : Alain.Abarnou@ifremer.fr
Link : pdf

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