title: Mercury and selenium concentrations in livers and eggs of common loons (Gavia immer) from Minnesota.
abstract: Mercury and selenium act as mutual antagonists in mature birds, but their toxicity is additive or synergistic in avian embryos and immature birds. Twenty eggs and livers from 18 mature and 9 immature common loon carcasses found in Minnesota were collected. Livers and eggs were analyzed for mercury and selenium by atomic emission and atomic absorption spectroscopy. Liver mercury concentrations were significantly higher in mature loons compared to those of immature loons and eggs. Liver selenium concentrations were significantly higher in mature loons than those of immature loons, and selenium concentrations in immature loon livers were significantly higher than levels in eggs. There was a significant positive correlation between mercury and selenium in loon livers. There was a negative correlation between mercury and selenium in eggs.
authors.affiliation: Department of Pathobiology, University of Florida, College of Veterinary Medicine, PO Box 110880, Gainesville, Florida 32611, USA. toffana99@yahoo.com
authors.forename: K
authors.initials: K
authors.lastname: Bischoff
authors.forename: J
authors.initials: J
authors.lastname: Pichner
authors.forename: W E
authors.initials: WE
authors.lastname: Braselton
authors.forename: C
authors.initials: C
authors.lastname: Counard
authors.forename: D C
authors.initials: DC
authors.lastname: Evers
authors.forename: W C
authors.initials: WC
authors.lastname: Edwards
mesh_terms: D000367:Age Factors; D000818:Animals; D001717:Birds; D004531:Eggs; D004781:Environmental Exposure; D008099:Liver / Q000737:chemistry; D008628:Mercury / Q000032:analysis* / Q000493:pharmacokinetics; D012643:Selenium / Q000032:analysis* / Q000493:pharmacokinetics; D014873:Water Pollutants / Q000032:analysis* / Q000493:pharmacokinetics
chemical_list: D014873:Water Pollutants; D008628:Mercury; D012643:Selenium