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            <gco:CharacterString>Chételat, J., M. Richardson, H. Hintelmann, M. Amyot, A. Poulain, D. Crump. 2012. A latitudinal investigation of ecosystem sensitivity to methylmercury bioaccumulation in Arctic fresh waters. Northern Contaminants Program Project M-16.</gco:CharacterString>
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                <gmd:LocalisedCharacterString locale="#fra">Chételat, J., M. Richardson, H. Hintelmann, M. Amyot, A. Poulain, D. Crump. 2012. Une enquête latitudinale sur la sensibilité des écosystèmes à la bioaccumulation du méthylmercure dans les eaux douces de l'Arctique. Projet M-16 du Programme de lutte contre les contaminants dans le Nord.</gmd:LocalisedCharacterString>
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        <gco:CharacterString>Over three years (2012 to 2015), we are comparing MeHg bioaccumulation in three study areas that cover a latitudinal gradient in ecosystem types in the Canadian Arctic, specifically Kuujjuaraapik (sub-Arctic taiga), Iqaluit (tundra) and Resolute Bay (polar desert). In water bodies from each of these study areas, we will investigate two key aspects of MeHg bioaccumulation, specifically MeHg bioavailability to benthic food webs and organism growth rates. Using a cross-ecosystem comparison to test these hypotheses, we will conduct the following in lakes and ponds from each study area: - Characterize the watersheds of study sites (geomorphology and physiography) through satellite image classification and digital terrain analysis in order to examine watershed influences on measured lake physico-chemistry, particularly levels of organic carbon and Hg in sediment and water; - Estimate bioavailable MeHg in sediment pore water using a novel technique (Diffusive Gradient in Thin films, or DGT); - Measure MeHg concentrations in benthic food webs (algae, invertebrates and fish); and - Estimate short-term growth rates in invertebrates and fish using tissue DNA and RNA content. Project results will provide a conceptual model of climate-related environmental processes that affect the exposure of Arctic freshwater fish to MeHg. This information is critical to understand how climate change is affecting temporal and geographic trends of Hg bioaccumulation in Arctic fish monitored by the NCP.

Mercury is a priority contaminant of the Northern Contaminants Program (NCP) due to its prevalence in the Arctic and high levels found in some traditional food species. The main objective of this project is to investigate climate-related environmental controls on methylmercury (MeHg) bioaccumulation in Arctic freshwater food webs. Recent evidence indicates that inorganic mercury (Hg) loadings to Arctic lakes decline with latitude; however, MeHg concentrations in benthic invertebrates and fish do not similarly decline along this gradient in Hg loading. These observations suggest that environmental factors may play an important role in ecosystem sensitivity to Hg bioaccumulation in the Canadian Arctic. We hypothesize that climate's dominant control on organic matter production affects two key aspects of MeHg bioaccumulation, specifically MeHg bioavailability to food webs and organism growth rates. In addition, a latitudinal water temperature gradient likely affects organism growth rates.</gco:CharacterString>
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            <gmd:LocalisedCharacterString locale="#fra">Sur une période de trois ans (de 2012 à 2015), nous avons comparé la bioaccumulation du méthylmercure(1+) dans trois zones d’étude qui couvrent un gradient latitudinal de types d’écosystèmes dans l’Arctique canadien, notamment à Kuujjuarapik (taïga subarctique), Iqaluit (toundra) et Resolute Bay (désert polaire). Dans les étendues d’eau de chacune de ces zones d’étude, nous étudierons deux aspects clés de la bioaccumulation de méthylmercure(1+), notamment la biodisponibilité de ce composé pour les réseaux trophiques benthiques et les taux de croissance des organismes. En effectuant une comparaison croisée entre écosystèmes pour éprouver ces hypothèses, nous réaliserons les activités suivantes concernant les lacs et les étangs de chacune des zones d’étude : caractériser les bassins hydrographiques des sites d’étude (géomorphologie et physiographie) par l’entremise d’une classification des images satellites et d’une analyse numérique du terrain permettant d’examiner l’incidence du bassin hydrographique sur la physicochimie, notamment sur les niveaux de carbone organique et de mercure dans les sédiments et l’eau; estimer le méthylmercure(1+) biodisponible dans l’eau interstitielle des sédiments en utilisant une technique nouvelle (gradients de diffusion en couches minces); mesurer les concentrations de méthylmercure(1+) dans les réseaux trophiques benthiques (algues, invertébrés et poissons); estimer les taux de croissance à court terme des invertébrés et des poissons en utilisant le contenu en ADN et en ARN des tissus. Les résultats du projet nous permettront de produire un modèle conceptuel des processus environnementaux liés au climat qui touchent l’exposition des poissons d’eau douce de l’Arctique au méthylmercure(1+). Cette information est essentielle si l’on veut comprendre comment les changements climatiques affectent les tendances temporelles et géographiques de la bioaccumulation du mercure chez les poissons de l’Arctique faisant l’objet d’une surveillance en vertu du Programme de lutte contre les contaminants dans le Nord.

Le mercure est un contaminant prioritaire du Programme de lutte contre les contaminants dans le Nord (PLCN) en raison de sa prévalence dans l'Arctique et des niveaux élevés trouvés dans certaines espèces alimentaires traditionnelles. L'objectif principal de ce projet est d'étudier les contrôles environnementaux liés au climat sur la bioaccumulation du méthylmercure (MeHg) dans les réseaux alimentaires d'eau douce de l'Arctique. Des preuves récentes indiquent que les charges de mercure inorganique (Hg) dans les lacs arctiques diminuent avec la latitude ; cependant, les concentrations de MeHg dans les invertébrés benthiques et les poissons ne diminuent pas de la même manière le long de ce gradient de charge en Hg. Ces observations suggèrent que les facteurs environnementaux peuvent jouer un rôle important dans la sensibilité des écosystèmes à la bioaccumulation du Hg dans l'Arctique canadien. Nous émettons l'hypothèse que le contrôle dominant du climat sur la production de matière organique affecte deux aspects clés de la bioaccumulation du MeHg, en particulier la biodisponibilité du MeHg pour les réseaux alimentaires et les taux de croissance des organismes. En outre, un gradient latitudinal de température de l'eau affecte probablement les taux de croissance des organismes.</gmd:LocalisedCharacterString>
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                  <gmd:address>
                    <gmd:CI_Address>
                      <gmd:deliveryPoint xsi:type="gmd:PT_FreeText_PropertyType">
                        <gco:CharacterString>Fontaine Building 12th floor, 200 Sacré-Coeur Blvd</gco:CharacterString>
                        <gmd:PT_FreeText>
                          <gmd:textGroup>
                            <gmd:LocalisedCharacterString locale="#fra">200 Sacré-Coeur Blvd, Édifice Fontaine 12e étage</gmd:LocalisedCharacterString>
                          </gmd:textGroup>
                        </gmd:PT_FreeText>
                      </gmd:deliveryPoint>
                      <gmd:city>
                        <gco:CharacterString>Gatineau</gco:CharacterString>
                      </gmd:city>
                      <gmd:administrativeArea xsi:type="gmd:PT_FreeText_PropertyType">
                        <gco:CharacterString>Quebec</gco:CharacterString>
                        <gmd:PT_FreeText>
                          <gmd:textGroup>
                            <gmd:LocalisedCharacterString locale="#fra">Québec</gmd:LocalisedCharacterString>
                          </gmd:textGroup>
                        </gmd:PT_FreeText>
                      </gmd:administrativeArea>
                      <gmd:postalCode>
                        <gco:CharacterString>K1A 0H3</gco:CharacterString>
                      </gmd:postalCode>
                      <gmd:country xsi:type="gmd:PT_FreeText_PropertyType">
                        <gco:CharacterString>Canada</gco:CharacterString>
                        <gmd:PT_FreeText>
                          <gmd:textGroup>
                            <gmd:LocalisedCharacterString locale="#fra">Canada (le)</gmd:LocalisedCharacterString>
                          </gmd:textGroup>
                        </gmd:PT_FreeText>
                      </gmd:country>
                      <gmd:electronicMailAddress xsi:type="gmd:PT_FreeText_PropertyType">
                        <gco:CharacterString>ec.enviroinfo.ec@canada.ca</gco:CharacterString>
                        <gmd:PT_FreeText>
                          <gmd:textGroup>
                            <gmd:LocalisedCharacterString locale="#fra">ec.enviroinfo.ec@canada.ca</gmd:LocalisedCharacterString>
                          </gmd:textGroup>
                        </gmd:PT_FreeText>
                      </gmd:electronicMailAddress>
                    </gmd:CI_Address>
                  </gmd:address>
                  <gmd:onlineResource>
                    <gmd:CI_OnlineResource>
                      <gmd:linkage>
                        <gmd:URL>http://ec.gc.ca</gmd:URL>
                      </gmd:linkage>
                      <gmd:protocol>
                        <gco:CharacterString>http</gco:CharacterString>
                      </gmd:protocol>
                    </gmd:CI_OnlineResource>
                  </gmd:onlineResource>
                  <gmd:hoursOfService gco:nilReason="missing" xsi:type="gmd:PT_FreeText_PropertyType">
                    <gco:CharacterString />
                    <gmd:PT_FreeText>
                      <gmd:textGroup>
                        <gmd:LocalisedCharacterString locale="#fra" />
                      </gmd:textGroup>
                    </gmd:PT_FreeText>
                  </gmd:hoursOfService>
                </gmd:CI_Contact>
              </gmd:contactInfo>
              <gmd:role>
                <gmd:CI_RoleCode codeList="https://schemas.metadata.geo.ca/register/napMetadataRegister.xml#IC_90" codeListValue="RI_412">distributor; distributeur</gmd:CI_RoleCode>
              </gmd:role>
            </gmd:CI_ResponsibleParty>
          </gmd:distributorContact>
          <gmd:distributionOrderProcess>
            <gmd:MD_StandardOrderProcess>
              <gmd:fees gco:nilReason="missing">
                <gco:CharacterString />
              </gmd:fees>
            </gmd:MD_StandardOrderProcess>
          </gmd:distributionOrderProcess>
        </gmd:MD_Distributor>
      </gmd:distributor>
    </gmd:MD_Distribution>
  </gmd:distributionInfo>
</gmd:MD_Metadata>

