Yann Berthelot

French National Centre for Scientific Research, Lutetia Parisorum, Île-de-France, France

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Publications (2)1.96 Total impact

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    ABSTRACT: Bioaccumulation of cadmium, copper, and zinc was examined in common ragworms Hediste diversicolor from control (Bay of Somme, Blackwater) and metal-rich (Seine estuary, Boulogne harbor, Restronguet Creek) sites in France and the United Kingdom. The degree of exposure in the field was assessed by considering both total concentrations in superficial sediment and the quantities of metals which may be released in vitro at different pH levels. Among the three contaminated sites, release of the three metals was not detectable in Boulogne harbor, in correlation with limited enhancement of the metal concentrations in the common ragworms from this site. Even at those sites where zinc could be released in vitro from the sediment, zinc concentrations were not enhanced in common ragworms, in agreement with previous findings indicating that the body content of this metal is regulated in H. diversicolor. At all the studied sites, bioaccumulated zinc was mainly in cytosolic form. The distribution of cadmium and copper varied according to the origin of the common rag-worms, the insoluble fraction increasing with the degree of contamination (cadmium in the Restronguet Creek, copper in the Seine estuary, and even more in Restronguet Creek). In the cytosolic fraction, metals were partly linked to cytosolic heat-stable thiolic compounds (CHSTC) with molecular masses (5-6 kDa and about 12 kDa) consistent with metallothionein-like proteins (MTLP). Metal-binding to MTLP varied with the degree of contamination and with the metal studied. In contrast to many invertebrates, the presence of metal-binding CHSTC (MM about 2 kDa) other than MTLP seems to be a peculiar feature of H. diversicolor.
    Archives of Environmental Contamination and Toxicology 12/2003; 45(4):468-78. · 1.96 Impact Factor
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    ABSTRACT: In the framework of the Oslo convention, the first step of the assessment of the ecological risk induced by dredged contaminated sediments relies upon the determination of global concentrations of the most common contaminants. They are compared to guideline levels of contamination : under level 1, sediment-bound contaminants are considered as having negligible impact whereas above level 2 a possible negative impact must be envisaged. Paired sites, contaminated vs control, were investigated in the Gulf of Biscay and the Channel. Despite of concentrations well below level 1 (French regulation), sediments from Fier d'Ars showed toxicity towards mussel embryogenesis. On the contrary, Boulogne harbor sediments showed metal concentrations higher than level 2 but did not induce any additional metal accumulation in worms Hediste diversicolor compared to specimens from the Bay of Somme. This lack of effect has been explained by the low mobility of sediment-bound metals in Boulogne harbor.