Horizon / Plein textes La base de ressources documentaires de l'IRD

IRD

 

Publications des scientifiques de l'IRD

Pousse E., Flye-Sainte-Marie J., Alunno-Bruscia M., Hegaret H., Rannou E., Pecquerie Laure, Marques G. M., Thomas Y., Castrec J., Fabioux C., Long M., Lassudrie M., Hermabessiere L., Amzil Z., Soudant P., Jean F. (2019). Modelling paralytic shellfish toxins (PST) accumulation in Crassostrea gigas by using Dynamic Energy Budgets (DEB). Journal of Sea Research, 143 (Special Issue), 152-164. ISSN 1385-1101

Accès réservé (Intranet IRD) Demander le PDF

Lien direct chez l'éditeur doi:10.1016/j.seares.2018.09.002

Titre
Modelling paralytic shellfish toxins (PST) accumulation in Crassostrea gigas by using Dynamic Energy Budgets (DEB)
Année de publication2019
Type de documentArticle référencé dans le Web of Science WOS:000453497600015
AuteursPousse E., Flye-Sainte-Marie J., Alunno-Bruscia M., Hegaret H., Rannou E., Pecquerie Laure, Marques G. M., Thomas Y., Castrec J., Fabioux C., Long M., Lassudrie M., Hermabessiere L., Amzil Z., Soudant P., Jean F.
SourceJournal of Sea Research, 2019, 143 (Special Issue), p. 152-164. ISSN 1385-1101
RésuméAs other filter-feeders, Crassostrea gigas can concentrate paralytic shellfish toxins (PST) by consuming dino-flagellate phytoplankton species like Alexandrium minutum. Intake of PST in oyster tissues mainly results from feeding processes, i.e. clearance rate, pre-ingestive sorting and ingestion that are directly influenced by environmental conditions (trophic sources, temperature). This study aimed to develop a mechanistic model coupling the kinetics of PST accumulation and bioenergetics in C. gigas based on Dynamic Energy Budget (DEB) theory. For the first time, the Synthesizing Units (SU) concept was applied to formalize the feeding preference of oysters between non-toxic and toxic microalgae. Toxin intake and accumulation were both dependent on the physiological status of oysters. The accumulation was modelled through the dynamics of two toxin compartments: (1) a compartment of ingested but non-assimilated toxins, with labile toxins within the digestive gland eliminated via faeces production; (2) a compartment of assimilated toxins with a rapid detoxification rate (within a few days). Firstly, the DEB-PST model was calibrated using data from two laboratory experiments where oysters have been exposed to A. minutum. Secondly, it was validated using data from another laboratory experiment and from three field surveys carried out in the Bay of Brest (France) from 2012 to 2014. To account for the variability in PST content of A. minutum cells, the saxitoxin (STX) amount per energy units in a toxic algae (ppsT) was adjusted for each dataset. Additionally, the effects of PST on the oyster bioenergetics were calibrated during the first laboratory experiment. However, these effects were shown to depend on the strain of A. minutum. Results of this study could be of great importance for monitoring agencies and decision makers to identify risky conditions (e.g. production areas, seawater temperature), to properly assess detoxification step (e.g. duration, modalities) before any commercialization or to improve predictions regarding closing of shellfish areas.
Plan de classementSciences fondamentales / Techniques d'analyse et de recherche [020] ; Substances naturelles [035] ; Limnologie biologique / Océanographie biologique [034]
Descr. géo.FRANCE ; ATLANTIQUE ; BREST BAIE
LocalisationFonds IRD [F B010074830]
Identifiant IRDfdi:010074830
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010074830

Export des données

Disponibilité des documents

Télechargment fichier PDF téléchargeable

Lien sur le Web lien chez l'éditeur

Accès réservé en accès réservé

HAL en libre accès sur HAL


Accès aux documents originaux :

Le FDI est labellisé CollEx

Accès direct

Bureau du chercheur

Site de la documentation

Espace intranet IST (accès réservé)

Suivi des publications IRD (accès réservé)

Mentions légales

Services Horizon

Poser une question

Consulter l'aide en ligne

Déposer une publication (accès réservé)

S'abonner au flux RSS

Voir les tableaux chronologiques et thématiques

Centres de documentation

Bondy

Montpellier (centre IRD)

Montpellier (MSE)

Cayenne

Nouméa

Papeete

Abidjan

Dakar

Niamey

Ouagadougou

Tunis

La Paz

Quito