Communication Dans Un Congrès Année : 2024

Linking life traits and Dynamic Energy Budget parameters to better understand domoic acid contamination in five pectinid species.

Résumé

Species of the Pectinidae family are among the most fished and cultured molluscs species worldwide. Thus, investigating the links between environmental conditions and their life traits is important for a better management. Mechanistic models, based on Dynamic Energy Budget (DEB) theory, consider bioenergetics at the individual level. They allow to examine links between environmental conditions and physiological characteristics for each species, and life trait differences between species. One of the strengths of DEB theory, is the possibility to compare species based on parameter values for a similar model structure. To better constrain parameter estimation, multi-species estimation allows to estimate parameters for all species studied at the same time. Harmful algae are one example of links between environment and organism physiology. By their filtration activity, pectinid species can accumulate toxins produced by their prey. Particularly, domoic acid (DA), the amnesic shellfish toxin produced by diatoms of the genus Pseudo-nitzschia. The king scallop, Pecten maximus, accumulates the highest concentrations and when contaminated retains the toxin for a very long time. The Atlantic deep-sea scallop, Placopecten magellanicus, also bioaccumulates and relatively slowly decontaminates DA. They are known as “slow depurators”. In contrast, the variegated scallop, Mimachlamys varia, the Chilean scallop, Argopecten purpuratus and the giant lion’s paw, Nodipecten subnodosus are known as “fast depurators” with lower DA concentrations accumulated and faster depuration. While some hypotheses have been made to explain the long retention of P. maximus and the differences between species, processes are not yet known. This is why, comparing “slow depurators” and “fast depurators” may help understanding these processes. Toxin kinetics are linked to the organism metabolism, and it is hypothesised that differences in the toxin retention between species can be explained by physiological differences. Thus, coupling toxin kinetic to DEB model will allow testing hypotheses on toxin accumulation and retention for several pectinid species. In this study, a multi-species parameter estimation method was applied for these species to understand their differences and similarities in terms of physiological traits. Emphasis was made on specific assimilation and maintenance costs for the toxin kinetic part. After a comparison of life traits, particularly age and length at life cycle transitions and reproduction strategy, physiological hypotheses were made to base the multi-species estimation. Method and species comparison will be presented in this communication.

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Dates et versions

hal-04668517 , version 1 (06-08-2024)

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Eline Le Moan, Laure Pecquerie, Helene Hegaret, Paulo Lagos, Léo Heyer, et al.. Linking life traits and Dynamic Energy Budget parameters to better understand domoic acid contamination in five pectinid species.. 23rd International Pectinid Workshop, Apr 2024, Douglas, Isle of Man. ⟨hal-04668517⟩
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