| species-specific mercury bioaccumulation in a diverse fish community. | mercury bioaccumulation models developed for fish provide insight into the sources and transfer of hg within ecosystems. mercury concentrations were assessed for 16 fish species of the western reach of lake diefenbaker, saskatchewan, canada. for top predators (northern pike, esox lucius; walleye, sander vitreum), hg concentrations were positively correlated to δ(15)n, and δ(15)n to fish age, suggesting that throughout life these fish fed on organisms with increasingly higher trophic values and h ... | 2015 | 26113505 |
| elevated mercury concentrations in fish in lakes in the mackenzie river basin: the role of physical, chemical, and biological factors. | during the mid-1990s and through the early 2000s, researchers determined that elevated mercury concentrations were a common occurrence in predatory fish in many lakes in the mackenzie river basin (mrb), located in northern canada. here we present the results of studies investigating factors contributing to higher mercury concentrations in fish in many of these lakes. twenty-two percent of lake trout, 33% of northern pike, and 50% of walleye populations had mean mercury concentrations >0.5 microg ... | 2005 | 16183101 |