to investigate interspecific and intersex differences in heavy metal levels , we analysed concentrations of cadmium , cobalt , chromium , copper , lead , mercury , manganese , nickel and zinc in the livers of male and female black duck ( anas rubripes ) , mallard ( a. platyrhynchos ) and greater scaup ( aythya marila ) collected in raritan bay , new jersey in december 1980 and january 1981 .
C0347988
heavy metal
C0043481
zinc