21 dossier(s) trouvé(s) portant l’étiquette "bioaccumulation" (les projets pluriannuels sont regroupés):
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Dragonfly mercury monitoring in the Northwest Territories
chercheur principal: Chetelat, John
Année(s) de permis: 2024 2023
Résumé: This licence has been issued for the scientific research application No. 5648. The main objective of this project is to measure mercury in dragonfly larvae from a variety of aquatic ecosystems in the Yellowknife area. This information will be collected as part of a Canada-wide project to evaluate geographic and temporal patterns of mercury bioaccumulation. The first priority will be to inve...


Biochemical and metabolomic impact of trace metals (As, Sb, Cd, Ag, La, Ce) in various fish species and amphipods collected from the metal-impacted Yellowknife area
chercheur principal: Rosabal, Maikel
Année(s) de permis: 2022
Résumé: This licence has been issued for the scientific research application No.5278. The main goal is to generate a specific knowledge about the implications of metals bioaccumulated observed in the population of three species of fish (e.g., northern pike, lake whitefish, yellow perch) and invertebrates (H. azteca) inhabiting ecosystems located in this mining region. The specific objectives are: 1) to...


A multidisciplinary investigation of recovery in Yellowknife area lakes from 50 years of arsenic pollution: What are the factors inhibiting recovery and the biological consequences?
chercheur principal: Palmer, Mike
Année(s) de permis: 2019 2018 2017
Résumé: The overarching objectives of this research are two-fold: 1)To investigate watershed and within-lake abiotic processes affecting the recovery of mine-impacted lakes in the Yellowknife area, including storage and release of arsenic from soils, seasonal dynamics of arsenic export in runoff, and fluxes of arsenic to and from lake sediments; and 2) To investigate the toxicological consequences of ...


Cumulative impacts of metal deposition in the NWT: Using lead isotopes to trace local, regional and long-range sources
chercheur principal: Chételat, John
Année(s) de permis: 2014 2013
Résumé: Recent increases in fish mercury concentrations in the Mackenzie River basin are an environmental and human health concern. In several cases, new fish consumption advisories have been released by the NWT Health and Social Services for some lakes in the NWT. It remains unclear what processes are driving these trends in metal bioaccumulation. Two dominant hypotheses are: 1) new sources of long-range...


Evaluation of hydro-climatic drivers of contaminant transfer in aquatic food webs in the Husky Lakes Watershed (Inuvialuit Settlement Region, NWT)
chercheur principal: Gantner, Nikolaus (Klaus)
Année(s) de permis: 2013 2012 2011
Résumé: The long term goals of this research are: 1. to identify and quantify the physical, chemical and ecological processes that affect contaminant transfer in Arctic aquatic food webs in response to observed and predicted climate variability & change in the Husky Lakes Watershed (HLW); and 2. to provide people and regulators of Inuvik and Tuktoyaktuk with tools to effectively monitor selected highly...


Baseline mercury levels in predatory fish in the Sahtu Settlement Area
chercheur principal: Guthrie, Glen H
Année(s) de permis: 2011 2010
Résumé: This study will provide current information about the health of some subsistence predatory fish in ten commonly used lakes by residents of the Sahtu Settlement Area (SSA). This investigation may help to identify alternative sources of fish from lakes not impacted to the degree as seen in Kelly Lake. A future, far more thorough study of mercury abundance and bio-magnification trends may also result...


The Continuation of a Community-led Fish Monitoring Study in Déline, NT
chercheur principal: Macdonald, Colin R
Année(s) de permis: 2012 2010 2009
Résumé: The objective of this study is to collect whitefish and lake trout in the Keith Arm of Great Bear Lake near Deline and analyze tissues for metals and radionuclides. The results of this study will supplement the results of a study conducted in 2009 which reported the concentrations of metals, radionuclides and organo-chlorine pesticides in a small number of trout and herring. Twenty whitefis...


Bioaccumulation of Brominated Flame Retardants, Currently Used Pesticides, and emerging metal trends in the Vegetation-Caribou-Wolf Food Chain
chercheur principal: Katz, Sharon
Année(s) de permis: 2009
Résumé: The objectives of this study are: (a) To determine whether brominated flame retardants (BFRs), current use pesticides (CUPs), perfluorinated compounds (PFCs), and mercury bioaccumulate using the vegetation-caribou-wolf food chain and the Bathurst caribou herd as a model; (b) To explore possible sources of lead contamination in the Bathurst herd caribou; (c) To elucidate the pathway of lead uptake ...


Using Quantitative Fatty Acid Signature Analysis to Investigate Diet and Mercury in Porcupine Caribou
chercheur principal: Chan, Laurie H. M.
Année(s) de permis: 2007
Résumé: Lichens, cotton grass and willows will be collected in the NWT to be used in a study of caribou diet in comparison with quantitative fatty acid signature (QFASA) and mercury analyses. Fieldwork is being conducted in correlation with a caribou serum and adipose tissue sampling project. Mercury (Hg) is a global environmental contaminant that derives mostly from burning fossil fuels. The Porcupine...


Temporal trends and spatial variations in persistent organic pollutants and metals in sea-run char from the Canadian Arctic
chercheur principal: Evans, Marlene S.
Année(s) de permis: 2007 2006
Résumé: This study is designed to determine what the levels of contaminants are in char when these fish return from feeding in the ocean in the summer. This is the fourth year of a study investigating the contaminant levels in sea-run Arctic char as they return from feeding in the ocean. The reason this study is being conducted is to provide communities with more information on the chemical levels in t...


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