SCHOLTEN M & FOEKEMA E (1989) Current research: Pollution threatens waterfowl breeding. LIMOSA 62 (3): 159-160.

The pollution of river silt settles areas (sedimentation), poses a serious threat to waterfowl who find their food. Especially birds fish and / or soil animals eat, get Lovel environmentally substances within these scarcely or not can reproduce. This is the result of an under loek conducted by the Department of Biology of the RIP Laboratory for Applied Marine Research in The Clear. To the load of contaminants in waterfowl Identifying, was raised by various species of waterfowl the amount of environmentally harmful substances in the liver determined. The material consisted drowned in nets birds. The study showed that metals (with exception of arsenic, cadmium and mercury) not a threat for waterfowl form. It is different with organochlorine compounds (OCY: PCBs and several pesticides). This is especially the diet that determines the ability waterbirds OCY exposed. It was found that the levels Grebes at OCY for fish-eating three to five times higher than in crested and scaup, mainly

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