Bioaccumulation of cadmium, copper and zinc in some tissues of three species of marine turtles stranded along the French Atlantic coasts

Cadmium, copper and zinc have been analysed in some tissues and organs of L oggerhead, Kemp's Ridley (only muscle for this species) and Leatherback tur tles stranded along the Atlantic coasts of France. The pancreas analysed on ly in Leatherback turtles exhibited the highest metal concentrations, which is very surprising for an organ which does not play a role in the detoxifi cation processes. The distribution of these elements in kidney, liver and m uscle were quite similar to that found in marine mammals or seabirds. Never theless, mean cadmium concentrations in the kidney were as high as 13.3 mu g g(-1) wet weight in the Loggerhead turtles and 30.3 mu g g(-1) wet weight in the Leatherback turtles. Such high concentrations in the Leatherback tu rtles have never been recorded before. The main source of cadmium for marin e turtles is probably the food. The Leatherback turtles are known to feed m ainly on jellyfish in this area. Ten times higher cadmium concentrations ha ve been determined in jellyfish compared to fish, This would imply a greate r exposure to cadmium for Leatherback turtles, which probably need to eat g reat quantities of jellyfish to cover their needs. (C) 1999 Elsevier Scienc e Ltd. All rights reserved.