Publications

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assessment of larval deformities and selenium accumulation in northern pike (esox lucius) and white sucker (catostomus commersoni) exposed to metal mining effluent.uranium mining and milling operations in northern saskatchewan (canada) release effluents with elevated levels of certain trace metals and metalloids, including selenium. the goal of the present study was to evaluate the presence of selenium-induced deformities in northern pike (esox lucius) and white sucker (catostomus commersoni) larvae originating from adults collected downstream of a uranium mine. eggs were fertilized in the field and incubated in the laboratory following a two-way (crossove ...200918939891
altered energetics and parasitism in juvenile northern pike (esox lucius) inhabiting metal-mining contaminated lakes.the objective of this study was to evaluate possible factors that could be contributing to altered bioenergetics of juvenile northern pike (esox lucius) living in lakes receiving effluent from the key lake uranium mill in northern saskatchewan, canada. although glycogen and triglycerides stores in liver and muscle were significantly greater in pike from exposure lakes compared to the reference, triglycerides stores of aquatic insects and spottail shiners that are prey items of juvenile pike show ...200818329711
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 ...201526113505
can natural variability trigger effects on fish and fish habitat as defined in environment canada's metal mining environmental effects monitoring program?the metal mining effluent regulations (mmer) took effect in 2002 and require most metal mining operations in canada to complete environmental effects monitoring (eem) programs. an "effect" under the mmer eem program is considered any positive or negative statistically significant difference in fish population, fish usability, or benthic invertebrate community eem-defined endpoints. two consecutive studies with the same statistically significant differences trigger more intensive monitoring, incl ...201322888037
a toxicological examination of whitefish (coregonus clupeaformis) and northern pike (esox lucius) exposed to uranium mine tailings.operation of the gunnar uranium mine, in nothern saskatchewan, canada, from 1955 to 1964, resulted in the deposition of radioactive tailings in langley bay, a small bay connected to lake athabasca. previous publications have described the contamination of the sediments, water, macrophytes and fish of this area. the present study compares the parasite infestations, blood hematocrit, histopathology and condition factor (k) of the langley bay whitefish and northern pike populations with these facto ...20132386411
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 ...200516183101
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