Accession Number : ADA322766

Title :   Factors Affecting the Mobilization, Transport, and Bioavailability of Mercury in Reservoirs of the Upper Missouri River Basin.

Descriptive Note : Technical rept. no. 10,

Corporate Author : MONTANA COOPERATIVE FISHERY RESEARCH UNIT BOZEMAN

Personal Author(s) : Phillips, Glenn R. ; Medvick, Patricia A. ; Skaar, Donald R. ; Knight, Denise E.

PDF Url : ADA322766

Report Date : 1987

Pagination or Media Count : 71

Abstract : Factors controlling the mobilization, transport, and bioavailability of mercury in relation to coal mining and other mercury sources were studied in reservoirs of the Upper Missouri River Basin. We assessed mercury and selenium contamination of fishes and sediments in 10 reservoirs, estimated mercury fluxes in Tongue River Reservoir, determined dietary accumulation of methylmercury by fish, and related limnological conditions in three reservoirs to rates of mercury accumulation by fish. Detailed limnological studies were conducted in Nelson, Cookson, and Tongue River reservoirs. Mercury concentrations were higher in walleyes (Stizostedion vitreum vitreum) from headwater reservoirs with unregulated inflows than in fish of the same size from downstream reservoirs. Erosion and leaching during flooding apparently facilitated mercury accumulation by fish in reservoirs.

Descriptors :   *TRANSPORT, *MERCURY COMPOUNDS, *RESERVOIRS, METHYL RADICALS, CONTAMINATION, SEDIMENTS, BASINS(GEOGRAPHIC), CONCENTRATION(CHEMISTRY), LEACHING, FISHES, MISSOURI RIVER, MONTANA, COAL MINES, SELENIUM.

Subject Categories : Biochemistry
      Biology
      Ecology
      Toxicology

Distribution Statement : APPROVED FOR PUBLIC RELEASE