| bioaccumulation of radionuclides in fertilized canadian shield lake basins. | radionuclide tracers of heavy metals (59fe, 60co, 65zn, 75se, 85sr, 134cs and 203hg) representing potential contamination from nuclear power plants, industry and agriculture were added to separate basins of lake 226, experimental lakes area, northwestern ontario. the two basins were part of a eutrophication experiment and differed in their trophic status; the north basin (l226n) was eutrophic whereas the south basin (l226s) was mesotrophic. our objective was to determine the uptake of the radion ... | 1998 | 9718743 |
| long-term changes in fish mercury levels in the historically impacted english-wabigoon river system (canada). | the english-wabigoon river system in northwestern ontario, canada, was one of the most heavily mercury-contaminated waterways in the world due to historical discharges in the 1960s from a chlor-alkali plant. this study examines long-term (1970-2010) monitoring data to assess temporal trends in mercury contamination in walleye, northern pike and lake whitefish, three species important for sport and subsistence fishing in this region, using dynamic linear modeling and piecewise regression. for all ... | 2012 | 22785387 |
| polybrominated diphenyl ethers (pbdes) in great lakes fish: levels, patterns, trends and implications for human exposure. | levels of polybrominated diphenyl ethers (pbdes) were measured in edible portions of great lakes fish, with the goal of examining patterns/trends and evaluating implications for human exposure. a total of 470 fillets of 18 fish species collected from various parts of the canadian waters of the great lakes between 2006 and 2013 were analyzed for 17 (expanded to 33 in 2009) pbdes. for a limited number of species, fillet to whole body and fillet to eggs pbdes were compared to examine pattern and co ... | 2017 | 27865120 |
| temporal trends and spatial distribution of dioxins and furans in lake trout or lake whitefish from the canadian great lakes. | concentrations of the seventeen 2,3,7,8-substituted, most toxic congeners of polychlorinated dibenzo-p-dioxins (pcdds) and polychlorinated dibenzofurans (pcdfs) were measured in lake trout (salvelinus namaycush) or lake whitefish (coregonus clupeaformis) collected between 1989 and 2003 from the canadian great lakes as a part of the on-going sport fish contaminant monitoring program of the ontario ministry of the environment. these monitoring data were used to assess temporal trends and spatial v ... | 2008 | 18501406 |