Custer, C. M., and Custer, T. W., 2000, Organochlorine and trace element contamination in wintering and migrating diving ducks in the southern Great Lakes, USA, since the zebra mussel invasion: Environmental Toxicology and Chemistry, v. 19, no. 11, p. 2821-2829. Abstract Keywords Lesser scaup, Diving ducks, Organochlorine contaminants, Trace elements, Selenium