title: Total mercury concentrations in anadromous Northern Dolly Varden from the northwestern Canadian Arctic: a historical baseline study.
abstract: Previous research has documented the significance of total mercury (THg) as a northern contaminant in general and of fish in particular. While much research has been devoted to documenting both spatial and temporal changes in THg in consumed fish, little effort has been directed at understanding patterns of THg in Dolly Varden (Salvelinus malma), a prized subsistence species throughout the western North American Arctic. Here we report historical THg concentrations for anadromous Dolly Varden from 10 populations in the Yukon and Northwest Territories sampled across a range of latitudes (67-69°N) and longitudes (136-141°W) between the years 1988-91. Unadjusted mean THg concentrations ranged from 15 to 254 ng/g wet weight. Length-adjusted THg concentrations were significantly different among sites, but were not related to latitude or longitude. Within and among populations, THg was significantly related to fork-length, age, δ(15)N, and δ(13)C, with the variation in THg found among populations being best explained by size. The data serve as an important baseline against which future changes in THg levels in this important subsistence fishery may be compared to determine the significance of any observed trends.
authors.affiliation: Department of Biology, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada. Electronic address: l5tran@uwaterloo.ca.
authors.forename: L
authors.initials: L
authors.lastname: Tran
authors.affiliation: Fisheries and Oceans Canada, Winnipeg, Manitoba R3T 2N6, Canada.
authors.forename: J D
authors.initials: JD
authors.lastname: Reist
authors.affiliation: Department of Biology, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada. Electronic address: m3power@uwaterloo.ca.
authors.forename: M
authors.initials: M
authors.lastname: Power
mesh_terms: D000818:Animals; D001110:Arctic Regions; D002170:Canada; D004784:Environmental Monitoring; D008628:Mercury / Q000378:metabolism*; D014337:Trout / Q000378:metabolism*; D014874:Water Pollutants, Chemical / Q000378:metabolism*
chemical_list: D014874:Water Pollutants, Chemical; D008628:Mercury
keywords: Age; Mercury; Rivers; Size; Spatial trends; Stable isotopes