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The importance of food as radionuclide source for the crustaceanDaphnia magna was investigated using a planktonic food chain composed of young pre-adult daphnids and two algal species(Scenedesmus obliquus and Cyclotella meneghiana). Daphnids placed in a tank containing natural 0.45 μm filteredwater were fed on algae previously kept during 4 days in natural water contaminated by 110mAg, 60Co, 137Cs...
The theoretical values of the steady-state trophic transfer factor, expressed on a wet weight basis in trout, are 0.0766 for 54 Mn, 0.0777 for 60 Co and 1.45 for 137 Cs. The two corresponding half-lives of the depuration kinetics for these elements are 8 and 1120 days, 4 and 170 days and 11 and 940 days, respectively. At the end of the uptake phase, the...
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