Cadmium kinetics in freshwater clams. III. Effects of zinc on uptake and distribution of cadmium inAnodonta cygnea
- 44 Downloads
Freshwater clams (Anodonta cygnea) were exposed to Cd2+ (25 μg/L) or to Cd2+ (25 μg/L) plus Zn2+ (2.5 mg/L). In the presence of zinc, uptake of cadmium in whole clam was halved. In organs such as the gills, mantle, and labial palps a still larger reduction of Cd accumulation occurred. By contrast, accumulation in midgut gland and kidney was hardly affected by the presence of zinc. It is shown that in the gills zinc competes with cadmium for metal binding sites both within the particulate fraction and the high-molecular weight fraction of the cytosol. Zinc probably did not induce an enlarged synthesis of specific metal-binding, metallothionein-like, proteins. In conclusion, zinc exerts antagonistic effects on uptake of cadmium by gills, and accelerates Cd transport from the gills towards the internal organs.
KeywordsZinc Waste Water Cadmium Water Pollution Cytosol
Unable to display preview. Download preview PDF.
- Ahsanullah M, Negilski DS, Mobley MC (1981) Toxicity of zinc, cadmium and copper to the shrimpCallianassa australiensis. III. Accumulation of metais. Mar Biol 64:311–316Google Scholar
- Bryan GW, Hummerstone LG (1973) Adaptation of the polychaeteNereis diversicolor to estuarine sediments containing high concentrations of zinc and cadmium. J Mar Biol Assoc U.K. 53:839–857Google Scholar
- Carpené E, George SG (1981) Absorption of cadmium by gills ofMytilus edulis (L.). Molec Physiol 1:23–34Google Scholar
- Eisler R, Gardner GR (1973) Acute toxicology to an estuarine teleost of mixtures of cadmium, copper and zinc salts, J Fish Biol 5:131–142Google Scholar
- Fowler SW, Benayoun G (1974) Experimental studies on cadmium flux through marine biota. In: Comparative studies of food and environmental contamination IAEA-SM 175/10. International Atomic Energy Agency, Vienna, pp 159–178Google Scholar
- Jackim E, Morrison G, Steele R (1977) Effects of environmental factors on radiocadmium uptake by four species of marine bivalves. Mar Biol 40:303–308Google Scholar
- Phillips DJH (1976) The common mussleMytilus edulis as an indicator of pollultion by zinc, cadmium, lead and copper. I. Effects of environmental variables on uptake of metals. Mar Biol 38:59–69Google Scholar
- Ray S, McLeese DW, Pezzack D (1979) Chelation and interelemental effects on the bioaccumulation of heavy metals by marine invertebrates. In: Proc Int Conf, Management and Control of Heavy Metals in the Environment. CEP Consultants, Edinburg, pp 35–38Google Scholar
- RIWA: Rijncommissie Waterleidingbedrijven (1983) Annual report of the cooperating Rhine and Meuse Water Supply Companies in the Netherlands and Belgium, Amsterdam (in Dutch)Google Scholar