title: Total and organic mercury in the Black Sea harbour porpoise Phocoena phocoena relicta.
abstract: This paper reports on mercury (Hg) concentrations in different tissues (liver, muscle, kidney, blubber and brain) of harbour porpoises Phocoena phocoena found dead in the Black Sea between 1997 and 1999, mainly bycaught in fishing nets (n = 79). Total Hg and organic Hg (MeHg) were determined. The main factor affecting Hg accumulation was, as expected, age, with MeHg concentration increasing with age. Accumulation of high concentrations of inorganic Hg in the liver was probably due to a slow demethylation process implying the formation of tiemannite (HgSe). In older adults, liver concentrations reached 35 microg g(-1) dry weight ('ppm') total Hg and 3 microg g(-1) dw MeHg. A geographical comparison with existing data from other regions showed a generally low Hg contamination of Black Sea porpoises, one order of magnitude lower than, e.g. in the North Sea.
authors.affiliation: Laboratory for Ecotoxicology, Free University of Brussels (VUB), Belgium. cjoiris@vub.ac.be
authors.forename: C R
authors.initials: CR
authors.lastname: Joiris
authors.forename: L
authors.initials: L
authors.lastname: Holsbeek
authors.forename: D
authors.initials: D
authors.lastname: Bolbat
authors.forename: C
authors.initials: C
authors.lastname: Gascard
authors.forename: T
authors.initials: T
authors.lastname: Stanev
authors.forename: A
authors.initials: A
authors.lastname: Komakhidze
authors.forename: W
authors.initials: W
authors.lastname: Baumgartner
authors.forename: A
authors.initials: A
authors.lastname: Birkun
mesh_terms: D000273:Adipose Tissue / Q000378:metabolism; D000367:Age Factors; D000818:Animals; D001921:Brain / Q000378:metabolism; D005260:Female; D007668:Kidney / Q000378:metabolism; D008099:Liver / Q000378:metabolism*; D008297:Male; D008628:Mercury / Q000493:pharmacokinetics*; D008767:Methylmercury Compounds / Q000493:pharmacokinetics; D009132:Muscles / Q000378:metabolism; D019576:Porpoises / Q000378:metabolism*; D014018:Tissue Distribution
chemical_list: D008767:Methylmercury Compounds; D008628:Mercury