Accumulation of nine metals and one metalloid in the tropical scallop Comptopallium radula from coral reefs in New Caledonia

Marc Metian (1, 2) , Paco Bustamante (1, 3) , Laetitia Hédouin (1, 2, 4) , Michel Warnau (2)

1 LIENSs - LIttoral ENvironnement et Sociétés
2 IAEA-MEL - Marine Environment Laboratories [Monaco]
3 CRELA - Centre de Recherche sur les Ecosystèmes Littoraux Anthropisés
4 CAMELIA - Caractérisation et modélisation des échanges dans des lagons soumis aux influences terrigènes et anthropiques

Uptake of waterborne Cd, Co, Mn and Zn was determined in laboratory experiments using radiotracer techniques (109Cd, 57Co, 54Mn and 65Zn). Labelled Zn was mainly accumulated in the digestive gland (65%) and Co in kidneys (81%); Cd and Mn were similarly distributed in digestive gland and gills. In a complementary field study, Ag, As, Cd, Co, Cr, Cu, Fe, Mn, Ni, and Zn were analysed in scallops collected at two stations showing different contamination levels. Digestive gland and kidneys displayed the highest concentrations. Ag, As, Cd, and Fe differed in soft tissues from the two stations, suggesting that C. radula could be a valuable local biomonitor species for these elements. Low Mn and Zn concentrations found in kidneys suggest that their content in calcium-phosphate concretions differs from the other pectinids. Preliminary risk considerations suggest that As would be the only element potentially leading to exposure of concern for seafood consumers.

Mots clés: tropical environment; trace elements; arsenic; radiotracers; Pectinidae; risk assessment; bioindicator species

Domaines: Ecotoxicologie

Marc Metian, Paco Bustamante, Laetitia Hédouin, Michel Warnau. Accumulation of nine metals and one metalloid in the tropical scallop Comptopallium radula from coral reefs in New Caledonia. Environmental Pollution, 2008, 152 (3), pp.543-552. ⟨10.1016/j.envpol.2007.07.009⟩. ⟨hal-00273868⟩