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Consommation de bivalves marins et pollution à l'arsenic : le risque lié à deux espèces comestibles en Martinique

Abstract : In Martinique, some coastal species bivalves are harvested in mangrove swamps and beaches for consumption. Due to their habitat distribution and their life habits, these species are highly bio-accumulators of pollutants. Thus, these fisheries considered a priori, as localized by some authors, provide food resources potentially contaminated by pollutants. However, there is little data on the importance and characteristics of these fisheries; the quantitative assessment of the stock and the health status of the bivalves being unknown. In addition, since 2011, floating clumps of sargassum are more frequent and therefore lead to increased mortality in coastal biocenosis. These Sargassum algae are known for their ability to accumulate a large amount of metals in their tissues. The released of these substances and in particular arsenic by desorption or by decomposing algal biomass constitute a risk of contamination for coastal biocenoses but also for consumers of bivalves.In this thesis, the importance and characteristics of fisheries as well as of the main species caught were described. The impact of strandings on a bivalve population has been outlined and the state of contamination of the bivalves has highlighted the presence of significant contamination by some metals but especially by arsenic. The exposure of bivalve consumers to these metals has been estimated. These results reveal consumer exposure as the daily intake ranged from 1.6 mg.day-1 to 6 mg. day-1 for a meal of 240 g of bivalves. As arsenic has very toxic chemical species, the proportions of which in the flesh of bivalves could increase in the context of sargassum strandings, the consumption of these bivalves must be limited and away from periods of sargassum stranding. In order to preserve the health of consumers, toxicologic reference doses for all arsenic species present in the flesh of these bivalves are proposed and discussed
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Submitted on : Wednesday, September 7, 2022 - 2:42:10 PM
Last modification on : Thursday, September 8, 2022 - 3:53:48 AM

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  • HAL Id : tel-03771563, version 1

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Emma Modestin. Consommation de bivalves marins et pollution à l'arsenic : le risque lié à deux espèces comestibles en Martinique. Géographie. Université des Antilles, 2020. Français. ⟨NNT : 2020ANTI0770⟩. ⟨tel-03771563⟩

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