Organic chlorine insecticide residues in Goosanders and Red-breasted Mergansers

Abstract

Appreciable quantities of residues of organic chlorine insecticides or their metabolites were found in eleven Goosanders and nine Red-breasted Mergansers collected in Scotland from March to July, 1964. The levels of contamination with dieldrin, which is very toxic to birds, were in most cases low compared with those reported in other birds feeding on freshwater fish in other areas of Britain.