Delineation of 134 Cs uptake pathways (seawater and food) in the variegated scallop Mimachlamys varia

Abstract : Among bivalves, scallops have been shown to be good bioindicator species for radionuclide monitoring. The present paper looked at the Cs bioaccumulation capacities of the variegated scallop Mimachlamys varia exposed separately via seawater and food under laboratory conditions. Results were compared with data previously obtained for the king scallop Pecten maximus, the only Pectinid species for which Cs accumulation has been studied in laboratory. Results indicated that M. varia has higher uptake capacity (CF: 1.86 ± 0.08) but lower absorption efficiency (A0l: 33 ± 5%) than P. maximus when exposed to waterborne Cs (CF of P. maximus: 0.94 ± 0.05 and A0l: 45 ± 3%). When scallops were fed radiolabeled phytoplankton, the assimilation efficiency of Cs was similar for the two species (AE: 24 ± 3% for M. varia and 28 ± 4% for P. maximus). Interspecific differences in terms of accumulation and retention, can be explained by physiological factors (including size of individuals) and/or difference in storage mecha- nisms. Indeed, organotropism differed between the two scallop species, suggesting the occurrence of specific redistribution mechanisms towards the tissues involved in Cs storage, excretion and detoxification. Finally, the present study examined the relative contribution of the different exposure pathways (seawater and food) to global 134Cs bioaccumulation for M. varia. Results showed that food constitutes the main accumulation pathway, contributing for 77% of the global 134Cs bioaccumulation.
Type de document :
Article dans une revue
Journal of Environmental Radioactivity, Elsevier, 2015, 148, pp.74-79
Liste complète des métadonnées

Littérature citée [34 références]  Voir  Masquer  Télécharger

https://hal.archives-ouvertes.fr/hal-01223701
Contributeur : Paco Bustamante <>
Soumis le : mercredi 4 novembre 2015 - 22:32:26
Dernière modification le : jeudi 11 janvier 2018 - 06:23:35
Document(s) archivé(s) le : vendredi 5 février 2016 - 10:25:31

Fichier

Pouil et al 2015 JER.pdf
Fichiers produits par l'(les) auteur(s)

Identifiants

  • HAL Id : hal-01223701, version 1

Collections

Citation

Simon Pouil, Paco Bustamante, Michel Warnau, François Oberhansli, Jean-Louis Teyssié, et al.. Delineation of 134 Cs uptake pathways (seawater and food) in the variegated scallop Mimachlamys varia. Journal of Environmental Radioactivity, Elsevier, 2015, 148, pp.74-79. 〈hal-01223701〉

Partager

Métriques

Consultations de la notice

214

Téléchargements de fichiers

83