THE USE OF FOUR MOLLUSCAN BIVALVES TO ASSESS THE PRESENCE OF CADMIUM AND LEAD AND THEIR DISTRIBUTION IN KHNIFISS LAGOON
- Institut National de Recherche Halieutique, Bd Sidi Abderrahmane 2 Ain Diab, Casablanca, Morocco.
- Faculté des sciences et Techniques, Route de Rabat, Mohammedia, Morocco.
- Université de Limoges, Groupement de Recherche Eau Sol Environnement (GRESE), Faculté des Sciences & Techniques, 123 avenue Albert Thomas, 87060 Limoges (France).
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The aim of this study was to investigate the presence and distribution of two potentially toxic trace metals cadmium (Cd) and lead (Pb) in a prominent ecosystem for aquaculture which is Khnifiss lagoon in southern coast of Morocco. Concentrations of Cadmium (Cd) and Lead (Pb) were examined in four species of bivalves; two transplanted species: Oysters (Crassostrea Gigas), mussels (Mytilus Galloprovincialis) and two native species: Clams (Ruditapes Decussates) and Cockles (Cardum Edule) collected from 5 stations covering the entire Khnifiss Lagoon from June 2006 and July 2007, in order to assess the presence, distribution and seasonal variation of both cadmium and lead. The sampling was conducted monthly to take into account variations into season and between seasons. The significant value of cadmium concentration was recorded in oysters near the lagoon inlet (station S1)1.30±0.41 mg/kg w.wt. The highest significant value of lead, of1.36±0.30 mg/kg w.wt, was recorded at station S3 in the middle of the lagoon. Oysters and mussels accumulate much more cadmium than clams and cockles (oyster?mussel??clam?cockle), but for lead the order was reversed (clam?cockle??mussel?oyster). A statistical analysis indicated that the cadmium level is affected by both "station" and "species" factors, while lead is affected only by the "species" factor.
[R. CHFIRI, S. BENBRAHIM, S. SOUABI, H. BAALI, M. BAUDU (2015); THE USE OF FOUR MOLLUSCAN BIVALVES TO ASSESS THE PRESENCE OF CADMIUM AND LEAD AND THEIR DISTRIBUTION IN KHNIFISS LAGOON Int. J. of Adv. Res. 3 (Oct). 1430-1440] (ISSN 2320-5407). www.journalijar.com
