Journal of Food, Agriculture and Environment

Influence of water hardness (calcium concentration) on the absorption of cadmium by the mangrove oyster Crassostrea gaster (Ostreidae; Bivalvia)

Author(s):

Arash Javanshir ^1*, Maryam Shapoori ²

Recieved Date: 2010-12-18, Accepted Date: 2011-03-27

Abstract:

Bioaccumulation of cadmium as a function of its concentration and exposure time in Crassostrea gaster (Ostreidae; Bivalvia) was studied in filtered sea water and in laboratory. Results showed that the accumulation of Cd in gills was greater than in other organs such as visceral mass. At 150 µg/L saturation as a function of time appeared in uptake of cadmium by gills, all binding sites for Cd may be occupied and cadmium redistributed to the other organs. Also total calcium concentration in gills of control animals was decreased by 20% by verapamil. Comparisons (t-tests) between animals pre-exposed and not pre–exposed (after 48 h and after 85 h) were significant at p<0.05. The fact that verapamil decreased total calcium concentration in gills of C. gaster may imply that calcium channels are present in this organ. The only significant effect was that of cadmium concentration in the medium (P<0.05) on calcium content of gills. After 85 h Cd exposure showed a significant effect on calcium concentration in gills (p<0.05). Results concerning gills after 48 h Cd exposure showed a decrease in calcium concentration at 150 µg Cd/L (referred to -VP) compared to control (t-test significant at p<0.01). No significant effect was noted when animals were pre–exposed with verapamil (referred to as +VP).

Keywords:

Bioaccumulation, cadmium, verapamil, Crassostrea gaster, metal uptake

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Journal: Journal of Food, Agriculture and Environment
Year: 2011
Volume: 9
Issue: 2
Category: Environment
Pages: 724-727

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