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        <gco:CharacterString>Ringed seals (Phoca hispida) have been used as bioindicator species of environmental contamination in Canada since the 1970s. In the present study, seals were harvested during subsistence hunts in four regions of the Canadian Arctic: Beaufort Sea, Arctic Archipelago, Hudson Bay, and coastal Labrador. An extensive suite of persistent organic pollutants (POPs) was determined in seal blubber collected for multiple years between 1972 and 2016. Results from this long-term study indicate geographical differences in the contaminant concentrations in seals and the significant general decrease of most POPs, including polychlorinated biphenyls (PCBs), dichlorodiphenyltrichloroethane (DDT) and related compounds, chlordanes (CHL), and hexachlorocyclohexanes (HCH) over time in ringed seals. Overall, results suggest that North American and international regulations have led to the long-term reduction of most POPs in Canadian Arctic ringed seals by reducing emissions from primary sources. However, other sources of legacy compounds (e.g., environmental reservoirs) as well changes in food web composition and structure in relation to climate changes could also be influencing the very slow rates of decline, or stable levels, of contaminants found in seals at some sites.</gco:CharacterString>
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            <gmd:LocalisedCharacterString locale="#fra">Les phoques annelés (Phoca hispida) sont utilisés depuis les années 1970 comme bioindicateur de la contamination environnementale au Canada. Dans l'étude présente, les phoques ont été capturés lors de la chasse de subsistance dans quatre régions de l'Arctique canadien: la mer de Beaufort, l'archipel arctique, la baie d'Hudson et la côte du Labrador. Une large gamme de polluants organiques persistants (POPs) a été déterminée dans la graisse de phoque collectée pendant plusieurs années entre 1972 et 2016. Les résultats de cette étude à long terme indiquent des différences géographiques dans les concentrations de contaminants chez les phoques et une diminution générale significative de la plupart des POPs, notamment: biphényles polychlorés (BPC), dichlorodiphényltrichloroéthane (DDT) et composés apparentés, chlordanes (CHL) et hexachlorocyclohexanes (HCH) en fonction du temps dans les phoques annelés. Dans l’ensemble, les résultats suggèrent que les réglementations nord-américaines et internationales ont conduit à une réduction à long terme de la plupart des POPs dans les phoques annelés de l’Arctique canadien en réduisant les émissions de sources primaires. Cependant, d'autres sources de composés hérités (par exemple, des réservoirs environnementaux) ainsi que des changements dans la composition et la structure de la chaîne alimentaire en relation avec les changements climatiques pourraient également influer sur les très faibles taux de diminution ou la stabilité des niveaux de contaminants trouvés dans les phoques sur certains sites.</gmd:LocalisedCharacterString>
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        <gco:CharacterString>The Northern Contaminants Program (NCP, http://www.science.gc.ca/eic/site/063.nsf/eng/h_7A463DBA.html) was established in 1991 in response to concerns about human exposure to elevated levels of contaminants in wildlife species that are important to the traditional diets of northern Aboriginal peoples. Early studies found a wide variety of substances, many of which had no Arctic or Canadian sources, but which were, nevertheless, reaching unexpectedly high levels in the Arctic ecosystem. 

The Canadian Cryospheric Information Network (CCIN, https://www.ccin.ca/) and the Polar Data Catalogue (PDC, https://polardata.ca/) have been developed over the past two decades through collaborative partnerships between the University of Waterloo and numerous government, university, and private organizations to provide the data and information management infrastructure for the Canadian cryospheric community. The PDC is one of Canada’s primary online sources for data and information about the Arctic and is Canada's National Antarctica Data Centre.

Polar Data Catalogue Canadian Cryospheric Information Network Metadata Record: https://www.polardata.ca/pdcsearch/PDCSearch.jsp?doi_id=10780

Supporting Projects:
Northern Contaminants Program (NCP)</gco:CharacterString>
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            <gmd:LocalisedCharacterString locale="#fra">Le Programme de lutte contre les contaminants dans le Nord (PLCN, http://www.science.gc.ca/eic/site/063.nsf/fra/h_7A463DBA.html) a été établi en 1991, en réponse aux préoccupations relatives à l’exposition des personnes à des concentrations élevées de contaminants chez les espèces sauvages qui constituent un élément important du régime alimentaire traditionnel des Autochtones du Nord. Les premières études ont indiqué que ces aliments contenaient une vaste gamme de substances, dont plusieurs ne provenaient pas de l’Arctique ou du Canada, mais atteignaient toutefois des concentrations étonnamment élevées dans l’écosystème arctique. 

Le Canadian Cryospheric Information Network (CCIN, https://www.ccin.ca/) et le Polar Data Catalogue (PDC, https://polardata.ca/) ont été élaborés au cours des deux dernières décennies grâce à des partenariats de collaboration entre l’Université de Waterloo et de nombreux, université, du gouvernement et des organisations du secteur privé pour fournir les données et l’infrastructure de gestion de l’information pour la communauté de la cryosphère canadienne. La PDC est l’une des principales sources en ligne pour obtenir des données et des renseignements au sujet de l’Arctique et de l’Antarctique national du Canada, Centre de données. 

Polar Data Catalogue Canadian Cryospheric Information Network: https://www.polardata.ca/pdcsearch/PDCSearch.jsp?doi_id=10780

Soutien aux projets : 
Programme de lutte contre les contaminants dans le Nord (PLCN)</gmd:LocalisedCharacterString>
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