title: Mercury, polybrominated diphenyl ether, organochlorine pesticide, and polychlorinated biphenyl concentrations in fish from lakes along an elevation transect in the French Pyrénées.
abstract: Concentrations of mercury and persistent organic pollutants in fish were examined in 11 lakes of the French Pyrénées spanning an elevation range of 2 km. All lakes were confined to a relatively small area within a 50-km diameter. Most of the lakes were within the Pyrénées National Park, which is restricted to recreational hiking, angling, and seasonal grazing of livestock, and are not subject to any known point sources of contaminants. Fish collected were mainly of 1 species (Salmo trutta fario), which is stocked regularly in the lakes. With increasing elevation, lake temperatures declined along with electrical conductivity and planktonic chlorophyll a. In contrast, water column nutrients (total phosphorus and total nitrogen) and epilithic periphyton biomass were not correlated with lake elevation. Of the global contaminants measured in fish, mercury, dicholorodiphenyltrichloroethane and its derivatives, and polybrominated diphenyl ethers showed the strongest positive correlation with elevation. Hg levels in some fish exceeded health consumption guidelines in these mountain lakes. Variation in fish contaminant levels was not related to differences in growth rate or to fish trophic position as determined using delta15N stable isotope measurements. This implies that the delivery and/or retention of many of these contaminants increase with lake elevation.
authors.affiliation: Department of Biology, University of Ottawa, 30 Marie Curie, Ottawa, Ont., Canada K1N 6N5. jblais@science.uottawa.ca
authors.forename: Jules M
authors.initials: JM
authors.lastname: Blais
authors.forename: Sylvain
authors.initials: S
authors.lastname: Charpentié
authors.forename: Frances
authors.initials: F
authors.lastname: Pick
authors.forename: Linda E
authors.initials: LE
authors.lastname: Kimpe
authors.forename: Annick
authors.initials: A
authors.lastname: St Amand
authors.forename: Catherine
authors.initials: C
authors.lastname: Regnault-Roger
mesh_terms: D000531:Altitude; D000818:Animals; D004784:Environmental Monitoring; D005399:Fishes / Q000378:metabolism*; D005602:France; D005618:Fresh Water; D006843:Hydrocarbons, Chlorinated / Q000032:analysis / Q000378:metabolism; D008628:Mercury / Q000032:analysis / Q000378:metabolism; D010575:Pesticides / Q000032:analysis / Q000378:metabolism; D010647:Phenyl Ethers / Q000032:analysis / Q000378:metabolism; D011075:Polybrominated Biphenyls / Q000032:analysis / Q000378:metabolism; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000378:metabolism
chemical_list: D006843:Hydrocarbons, Chlorinated; D010575:Pesticides; D010647:Phenyl Ethers; D011075:Polybrominated Biphenyls; D014874:Water Pollutants, Chemical; D008628:Mercury