Abstract
The Black-necked grebe (Podiceps nigricollis) is a migratory and dispersive birds species. Its breeding areas are located in central and eastern Europe; its wintering quarters are in western Europe, around the Mediterranean, Adriatic, Black and Caspian Seas. Recently Focardi et al. (1984) have reported that specimens of Black-necked grebes accumulate polychlorinated biphenyls and mercury in their tissues during their wintering in the Northern Adriatic lagoon of Marano. Residues of some chlorinated hydrocarbons and the levels of the mixed function oxidases (one of the most efficient hepatic detoxication systems) have been evaluated in specimens of Black-necked grebes collected in the lagoon of Marano during the wintering period (October and December 1984; April 1985) and are the subject of this report.
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