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Communication Dans Un Congrès Année : 2023

Comparing two pectinid species as a fast and a slow depurators of amnesic shellfish toxin through a modelling approach

Résumé

Microalgae species of the genus Pseudo-nitzschia (Psn) may produce domoic acid, an amnesic shellfish toxin (AST), and form blooms. Bivalves, filter-feeding animals, can feed on these microalgae species in the water column or sedimented on the bottom. During blooms of domoic acid-producing Psn, bivalves will accumulate the AST in their tissues via nutrition. By being toxic for Humans, domoic acid concentration is monitored in exploited shellfish species such as Pecten maximus, the king scallop. In France, P. maximus is the second most captured species, representing an important part of the economy. Hence, when the sanitary threshold of AST concentration is exceeded, the fishing closure of the king scallop causes significant socio-economic losses. The French MaSCoET project aims to determinate the reasons for Psn blooms and why P. maximus depurates more slowly than other pectinid species such as the variegated scallop, Mimachlamys varia. The objectives of my PhD thesis are (i) to better understand the links between individual bioenergetics and accumulation, storage and depuration of AST, (ii) to determine the impacts of environmental conditions on these relationships and (iii) to explain the mechanisms behind the different depuration capacities of pectinid species. For this, a contamination and decontamination model of domoic acid will be linked to the bioenergetics of the organism, based on the Dynamic Energy Budget (DEB) theory. The calibration and the validation of the model are based on data from the MaSCoET project. The methodology used to compare the two species with their own toxin retention, and how we could tackle the questions of depuration predictions depending on environmental conditions through model scenarios will be presented. The final goal will be to develop a tool to predict decontamination duration depending on environmental conditions and organism physiology, in order to help fishermen managing their fishing activity.
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Dates et versions

hal-04180049 , version 1 (11-08-2023)

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Paternité - Pas d'utilisation commerciale - Partage selon les Conditions Initiales

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  • HAL Id : hal-04180049 , version 1

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Eline Le Moan, Laure Régnier-Brisson, Laure Pecquerie, Caroline Fabioux, Fred Jean, et al.. Comparing two pectinid species as a fast and a slow depurators of amnesic shellfish toxin through a modelling approach. Conférence annuelle GdR Phycotox - GIS Cyanobactéries 2023, May 2023, Nantes, France. ⟨hal-04180049⟩
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