Delineation of Pb contamination pathways in two Pectinidae: the variegated scallop Chlamys varia and the king scallop Pecten maximus

Marc Metian (1, 2) , Michel Warnau (1, 2) , François Oberhänsli (2) , Paco Bustamante (1)

1 LIENSs - LIttoral ENvironnement et Sociétés
2 IAEA-MEL - Marine Environment Laboratories [Monaco]

Bioaccumulation of Pb was determined in Chlamys varia and Pecten maximus exposed to 210Pb via seawater, food and sediment. Both scallops readily concentrated dissolved Pb with whole-body 7-d concentration factors of 250 ± 40 and 170 ± 70, respectively. In both species, more than 70% of Pb taken up from seawater was strongly retained within tissues (biological half-life > 1.5 month) whereas Pb ingested with phytoplankton was poorly assimilated (< 20%). As P. maximus lives buried in the sediment, this exposure pathway was assessed and showed low bioaccumulation efficiency for sediment-bound Pb (transfer factor < 0.015). Despite the poor transfer efficiency of Pb from food and sediment, the use of a global bioaccumulation model indicated that the particulate pathway (food and/or sediment) constituted the major bioaccumulation route of Pb in both scallops. Whatever the exposure pathway, the digestive gland and kidneys always played a major role in Pb accumulation. In scallop tissues, Pb was predominantly associated with the insoluble subcellular fraction, suggesting a low bioavailability of Pb for scallop consumers.

Mots clés: Metal; Uptake kinetics; Retention; Bioavailability; Mollusc

Domaines: Ecotoxicologie

Marc Metian, Michel Warnau, François Oberhänsli, Paco Bustamante. Delineation of Pb contamination pathways in two Pectinidae: the variegated scallop Chlamys varia and the king scallop Pecten maximus. Science of the Total Environment, 2009, 407 (11), pp.3503-3509. ⟨10.1016/j.scitotenv.2009.02.010⟩. ⟨hal-00383936⟩