| contaminant exposure of birds nesting in green bay, wisconsin, usa. | in earlier studies, elevated concentrations of polychlorinated biphenyl (pcb) and p,p'-dichlorodiphenyldichloroethylene (dde) were reported in double-crested cormorant (phalacrocorax auritus) eggs and tree swallow (tachycineta bicolor) eggs and nestlings collected from lower green bay (wi, usa) in 1994 and 1995 and black-crowned night-heron (nycticorax nycticorax) eggs collected in 1991. comparable samples collected in 2010 and 2011 indicated that concentrations of pcbs were 35%, 62%, 70%, and 8 ... | 2014 | 24733712 |