title: Dicofol residues in eggs and carcasses of captive American kestrels.
abstract: American kestrels (Falco sparverius) were fed diets containing 0 (control), 1, 3, 10, and 30 microgram/g (wet wt) of Kelthane. Residues of dicofol and its metabolites were then analyzed in the eggs and carcasses of females. Significant differences occurred among treatments for residues of both p,p'-dicofol and p,p'-dechlorodicofol (DCD) in both eggs and carcasses and for p,p'-dicholorbenzophenone (DCBP) in eggs. Residue concentrations increased with increasing treatment exposure. Residues of p,p'-dicofol, p,p'-DCD, and p,p'-DCBP in eggs were significantly correlated with eggshell quality parameters. Significant correlations also occurred among contaminants in eggs and for individual contaminants between eggs and carcasses. The lowest-observed-dietary-effect concentration for eggshell thinning was 3 microgram/g, whereas 1 microgram/g may be considered to be near a no-observable-adverse-effect concentration. Concentrations of dicofol in potential prey items and eggs of wild birds generally have been lower than dietary-effect concentrations or concentrations in tissues or eggs associated with eggshell thinning and reduced reproductive success.
authors.affiliation: Biological Resources Division, U.S. Geological Survey, Patuxent Wildlife Research Center, Laurel, Maryland 20708, USA. stanley_wiemeyer@fws.gov
authors.forename: S N
authors.initials: SN
authors.lastname: Wiemeyer
authors.forename: D R
authors.initials: DR
authors.lastname: Clark
authors.forename: J W
authors.initials: JW
authors.lastname: Spann
authors.forename: A A
authors.initials: AA
authors.lastname: Belisle
authors.forename: C M
authors.initials: CM
authors.lastname: Bunck
mesh_terms: D000818:Animals; D004010:Dicofol / Q000032:analysis / Q000493:pharmacokinetics*; D004531:Eggs; D004781:Environmental Exposure; D005260:Female; D007306:Insecticides / Q000032:analysis / Q000493:pharmacokinetics*; D010573:Pesticide Residues; D020304:Raptors; D012098:Reproduction / Q000187:drug effects; D014018:Tissue Distribution
chemical_list: D007306:Insecticides; D010573:Pesticide Residues; D004010:Dicofol