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Influence of food quantity on the kinetics of cadmium uptake and loss via food and seawater in Mytilus edulis

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Abstract

The difference between the cadmium uptake via food and seawater in Mytilus edulis has been studied. This was done by labelling algae with Cd-109 and seawater with Cd-115m. Mussels were fed on six different quantities of Isochrysis galbana. Cadmium uptake via algae was more efficient at low food levels, while accumulation from seawater was linearly correlated with food quantities. Cadmium from food contributed only little to the body burden (0.2–0.5%). Half-lives for the elimination of cadmium ranged from 96–190 d and increased with decreasing availability of algae, presumably due to slowed down metabolism. Differences in elimination patterns suggest a release of both isotopes from different storage depots. A computer model shows that the food pathway can only play a significant role if algae are highly contaminated. It also demonstrates the paradox that in long-term studies the highest contribution of food-derived cadmium to the body burden must be expected near maintenance food concentrations.

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Communicated by O. Kinne, Hamburg

Labor für Radioökologie der Gewässer

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Borchardt, T. Influence of food quantity on the kinetics of cadmium uptake and loss via food and seawater in Mytilus edulis . Marine Biology 76, 67–76 (1983). https://doi.org/10.1007/BF00393057

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  • DOI: https://doi.org/10.1007/BF00393057

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