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                           <gml:endPosition>2010-01-31T00:00:00</gml:endPosition>
                        </gml:TimePeriod>
                     </gmd:extent>
                  </gmd:EX_TemporalExtent>
               </gmd:temporalElement>
            </gmd:EX_Extent>
         </gmd:extent>
         <gmd:extent>
            <gmd:EX_Extent>
               <gmd:geographicElement>
                  <gmd:EX_GeographicBoundingBox>
                     <gmd:westBoundLongitude>
                        <gco:Decimal>-8</gco:Decimal>
                     </gmd:westBoundLongitude>
                     <gmd:eastBoundLongitude>
                        <gco:Decimal>3</gco:Decimal>
                     </gmd:eastBoundLongitude>
                     <gmd:southBoundLatitude>
                        <gco:Decimal>43</gco:Decimal>
                     </gmd:southBoundLatitude>
                     <gmd:northBoundLatitude>
                        <gco:Decimal>52</gco:Decimal>
                     </gmd:northBoundLatitude>
                  </gmd:EX_GeographicBoundingBox>
               </gmd:geographicElement>
            </gmd:EX_Extent>
         </gmd:extent>
         <gmd:supplementalInformation>
            <gco:CharacterString>Pour plus d'informations sur ces données des ressources halieutiques (espèces, campagnes halieutiques, méthodologie), se reporter aux rapports détaillés des données halieutiques sur le site Granulats Marins  https://sextant.ifremer.fr/fr/web/granulats-marins</gco:CharacterString>
         </gmd:supplementalInformation>
      </gmd:MD_DataIdentification>
  </gmd:identificationInfo>
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               </gmd:name>
               <gmd:version gco:nilReason="unknown">
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            </gmd:MD_Format>
         </gmd:distributionFormat>
         <gmd:distributor>
            <gmd:MD_Distributor>
               <gmd:distributorContact>
                  <gmd:CI_ResponsibleParty>
                     <gmd:individualName>
                        <gco:CharacterString>Administrateur du serveur Sextant</gco:CharacterString>
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                     <gmd:organisationName>
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                     <gmd:positionName>
                        <gco:CharacterString>Dépositaire mandaté pour les données numériques</gco:CharacterString>
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                     <gmd:contactInfo>
                        <gmd:CI_Contact>
                           <gmd:phone>
                              <gmd:CI_Telephone>
                                 <gmd:voice>
                                    <gco:CharacterString/>
                                 </gmd:voice>
                                 <gmd:facsimile>
                                    <gco:CharacterString/>
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                              </gmd:CI_Telephone>
                           </gmd:phone>
                           <gmd:address>
                              <gmd:CI_Address>
                                 <gmd:deliveryPoint gco:nilReason="missing">
                                    <gco:CharacterString/>
                                 </gmd:deliveryPoint>
                                 <gmd:city gco:nilReason="missing">
                                    <gco:CharacterString/>
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                                 <gmd:administrativeArea gco:nilReason="missing">
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                                 </gmd:administrativeArea>
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                                 </gmd:postalCode>
                                 <gmd:country gco:nilReason="missing">
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                                 </gmd:country>
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                                    <gco:CharacterString>sextant@ifremer.fr</gco:CharacterString>
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                        </gmd:CI_Contact>
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                     <gmd:role>
                        <gmd:CI_RoleCode codeList="http://standards.iso.org/iso/19139/resources/gmxCodelists.xml#CI_RoleCode"
                                         codeListValue="distributor">distributor</gmd:CI_RoleCode>
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                  </gmd:CI_ResponsibleParty>
               </gmd:distributorContact>
            </gmd:MD_Distributor>
         </gmd:distributor>
         <gmd:transferOptions>
            <gmd:MD_DigitalTransferOptions>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
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                        <gmd:URL>https://sextant.ifremer.fr/services/wms/granulats_marins</gmd:URL>
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                     <gmd:protocol>
                        <gco:CharacterString>OGC:WMS</gco:CharacterString>
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                        <gco:CharacterString>IFR_GRA_HAL_R_COM_ZEUSFAB_CGFS</gco:CharacterString>
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                     <gmd:description>
                        <gco:CharacterString>CGFS</gco:CharacterString>
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                  </gmd:CI_OnlineResource>
               </gmd:onLine>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage gco:nilReason="withheld"/>
                     <gmd:protocol>
                        <gco:CharacterString>FILE</gco:CharacterString>
                     </gmd:protocol>
                     <gmd:name>
                        <gco:CharacterString>IFR_GRA_HAL_R_COM_ZEUSFAB_CGFS</gco:CharacterString>
                     </gmd:name>
                     <gmd:description>
                        <gco:CharacterString>CGFS</gco:CharacterString>
                     </gmd:description>
                  </gmd:CI_OnlineResource>
               </gmd:onLine>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>https://sextant.ifremer.fr/services/wfs/granulats_marins</gmd:URL>
                     </gmd:linkage>
                     <gmd:protocol>
                        <gco:CharacterString>OGC:WFS</gco:CharacterString>
                     </gmd:protocol>
                     <gmd:name>
                        <gco:CharacterString>IFR_GRA_HAL_R_COM_ZEUSFAB_CGFS</gco:CharacterString>
                     </gmd:name>
                     <gmd:description>
                        <gco:CharacterString>CGFS</gco:CharacterString>
                     </gmd:description>
                  </gmd:CI_OnlineResource>
               </gmd:onLine>
            </gmd:MD_DigitalTransferOptions>
         </gmd:transferOptions>
         <gmd:transferOptions>
            <gmd:MD_DigitalTransferOptions>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>https://sextant.ifremer.fr/services/wms/granulats_marins</gmd:URL>
                     </gmd:linkage>
                     <gmd:protocol>
                        <gco:CharacterString>OGC:WMS</gco:CharacterString>
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                     <gmd:name>
                        <gco:CharacterString>IFR_GRA_HAL_R_COM_ZEUSFAB_EVHO</gco:CharacterString>
                     </gmd:name>
                     <gmd:description>
                        <gco:CharacterString>EVHOE</gco:CharacterString>
                     </gmd:description>
                  </gmd:CI_OnlineResource>
               </gmd:onLine>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage gco:nilReason="withheld"/>
                     <gmd:protocol>
                        <gco:CharacterString>FILE</gco:CharacterString>
                     </gmd:protocol>
                     <gmd:name>
                        <gco:CharacterString>IFR_GRA_HAL_R_COM_ZEUSFAB_EVHO</gco:CharacterString>
                     </gmd:name>
                     <gmd:description>
                        <gco:CharacterString>EVHOE</gco:CharacterString>
                     </gmd:description>
                  </gmd:CI_OnlineResource>
               </gmd:onLine>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>https://sextant.ifremer.fr/services/wfs/granulats_marins</gmd:URL>
                     </gmd:linkage>
                     <gmd:protocol>
                        <gco:CharacterString>OGC:WFS</gco:CharacterString>
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                     <gmd:name>
                        <gco:CharacterString>IFR_GRA_HAL_R_COM_ZEUSFAB_EVHO</gco:CharacterString>
                     </gmd:name>
                     <gmd:description>
                        <gco:CharacterString>EVHOE</gco:CharacterString>
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                  </gmd:CI_OnlineResource>
               </gmd:onLine>
            </gmd:MD_DigitalTransferOptions>
         </gmd:transferOptions>
         <gmd:transferOptions>
            <gmd:MD_DigitalTransferOptions>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>https://sextant.ifremer.fr/services/wms/granulats_marins</gmd:URL>
                     </gmd:linkage>
                     <gmd:protocol>
                        <gco:CharacterString>OGC:WMS</gco:CharacterString>
                     </gmd:protocol>
                     <gmd:name>
                        <gco:CharacterString>IFR_GRA_HAL_R_COM_ZEUSFAB_LANG</gco:CharacterString>
                     </gmd:name>
                     <gmd:description>
                        <gco:CharacterString>LANGOLF</gco:CharacterString>
                     </gmd:description>
                  </gmd:CI_OnlineResource>
               </gmd:onLine>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage gco:nilReason="withheld"/>
                     <gmd:protocol>
                        <gco:CharacterString>FILE</gco:CharacterString>
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                     <gmd:name>
                        <gco:CharacterString>IFR_GRA_HAL_R_COM_ZEUSFAB_LANG</gco:CharacterString>
                     </gmd:name>
                     <gmd:description>
                        <gco:CharacterString>LANGOLF</gco:CharacterString>
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                  </gmd:CI_OnlineResource>
               </gmd:onLine>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>https://sextant.ifremer.fr/services/wfs/granulats_marins</gmd:URL>
                     </gmd:linkage>
                     <gmd:protocol>
                        <gco:CharacterString>OGC:WFS</gco:CharacterString>
                     </gmd:protocol>
                     <gmd:name>
                        <gco:CharacterString>IFR_GRA_HAL_R_COM_ZEUSFAB_LANG</gco:CharacterString>
                     </gmd:name>
                     <gmd:description>
                        <gco:CharacterString>LANGOLF</gco:CharacterString>
                     </gmd:description>
                  </gmd:CI_OnlineResource>
               </gmd:onLine>
            </gmd:MD_DigitalTransferOptions>
         </gmd:transferOptions>
         <gmd:transferOptions>
            <gmd:MD_DigitalTransferOptions>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>https://sextant.ifremer.fr/services/wms/granulats_marins</gmd:URL>
                     </gmd:linkage>
                     <gmd:protocol>
                        <gco:CharacterString>OGC:WMS</gco:CharacterString>
                     </gmd:protocol>
                     <gmd:name>
                        <gco:CharacterString>IFR_GRA_HAL_R_COM_ZEUSFAB_ORHA</gco:CharacterString>
                     </gmd:name>
                     <gmd:description>
                        <gco:CharacterString>ORHAGO</gco:CharacterString>
                     </gmd:description>
                  </gmd:CI_OnlineResource>
               </gmd:onLine>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage gco:nilReason="withheld"/>
                     <gmd:protocol>
                        <gco:CharacterString>FILE</gco:CharacterString>
                     </gmd:protocol>
                     <gmd:name>
                        <gco:CharacterString>IFR_GRA_HAL_R_COM_ZEUSFAB_ORHA</gco:CharacterString>
                     </gmd:name>
                     <gmd:description>
                        <gco:CharacterString>ORHAGO</gco:CharacterString>
                     </gmd:description>
                  </gmd:CI_OnlineResource>
               </gmd:onLine>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>https://sextant.ifremer.fr/services/wfs/granulats_marins</gmd:URL>
                     </gmd:linkage>
                     <gmd:protocol>
                        <gco:CharacterString>OGC:WFS</gco:CharacterString>
                     </gmd:protocol>
                     <gmd:name>
                        <gco:CharacterString>IFR_GRA_HAL_R_COM_ZEUSFAB_ORHA</gco:CharacterString>
                     </gmd:name>
                     <gmd:description>
                        <gco:CharacterString>ORHAGO</gco:CharacterString>
                     </gmd:description>
                  </gmd:CI_OnlineResource>
               </gmd:onLine>
            </gmd:MD_DigitalTransferOptions>
         </gmd:transferOptions>
         <gmd:transferOptions>
            <gmd:MD_DigitalTransferOptions>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>https://doi.org/10.17600/8050110</gmd:URL>
                     </gmd:linkage>
                     <gmd:protocol>
                        <gco:CharacterString>WWW:LINK</gco:CharacterString>
                     </gmd:protocol>
                     <gmd:name>
                        <gco:CharacterString>Campagne à la mer : CGFS2008</gco:CharacterString>
                     </gmd:name>
                     <gmd:description>
                        <gco:CharacterString>Campagne à la mer : CGFS2008</gco:CharacterString>
                     </gmd:description>
                  </gmd:CI_OnlineResource>
               </gmd:onLine>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>https://doi.org/10.17600/9050090</gmd:URL>
                     </gmd:linkage>
                     <gmd:protocol>
                        <gco:CharacterString>WWW:LINK</gco:CharacterString>
                     </gmd:protocol>
                     <gmd:name>
                        <gco:CharacterString>Campagne à la mer : CGFS2009</gco:CharacterString>
                     </gmd:name>
                     <gmd:description>
                        <gco:CharacterString>Campagne à la mer : CGFS2009</gco:CharacterString>
                     </gmd:description>
                  </gmd:CI_OnlineResource>
               </gmd:onLine>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>https://doi.org/10.17600/5040080</gmd:URL>
                     </gmd:linkage>
                     <gmd:protocol>
                        <gco:CharacterString>WWW:LINK</gco:CharacterString>
                     </gmd:protocol>
                     <gmd:name>
                        <gco:CharacterString>Campagne à la mer : EVHOE 2005</gco:CharacterString>
                     </gmd:name>
                     <gmd:description>
                        <gco:CharacterString>Campagne à la mer : EVHOE 2005</gco:CharacterString>
                     </gmd:description>
                  </gmd:CI_OnlineResource>
               </gmd:onLine>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>https://doi.org/10.17600/6040070</gmd:URL>
                     </gmd:linkage>
                     <gmd:protocol>
                        <gco:CharacterString>WWW:LINK</gco:CharacterString>
                     </gmd:protocol>
                     <gmd:name>
                        <gco:CharacterString>Campagne à la mer : EVHOE 2006</gco:CharacterString>
                     </gmd:name>
                     <gmd:description>
                        <gco:CharacterString>Campagne à la mer : EVHOE 2006</gco:CharacterString>
                     </gmd:description>
                  </gmd:CI_OnlineResource>
               </gmd:onLine>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>https://doi.org/10.17600/7040080</gmd:URL>
                     </gmd:linkage>
                     <gmd:protocol>
                        <gco:CharacterString>WWW:LINK</gco:CharacterString>
                     </gmd:protocol>
                     <gmd:name>
                        <gco:CharacterString>Campagne à la mer : EVHOE 2007</gco:CharacterString>
                     </gmd:name>
                     <gmd:description>
                        <gco:CharacterString>Campagne à la mer : EVHOE 2007</gco:CharacterString>
                     </gmd:description>
                  </gmd:CI_OnlineResource>
               </gmd:onLine>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>https://doi.org/10.17600/8040120</gmd:URL>
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                     <gmd:protocol>
                        <gco:CharacterString>WWW:LINK</gco:CharacterString>
                     </gmd:protocol>
                     <gmd:name>
                        <gco:CharacterString>Campagne à la mer : EVHOE 2008</gco:CharacterString>
                     </gmd:name>
                     <gmd:description>
                        <gco:CharacterString>Campagne à la mer : EVHOE 2008</gco:CharacterString>
                     </gmd:description>
                  </gmd:CI_OnlineResource>
               </gmd:onLine>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>https://doi.org/10.17600/9040060</gmd:URL>
                     </gmd:linkage>
                     <gmd:protocol>
                        <gco:CharacterString>WWW:LINK</gco:CharacterString>
                     </gmd:protocol>
                     <gmd:name>
                        <gco:CharacterString>Campagne à la mer : EVHOE 2009</gco:CharacterString>
                     </gmd:name>
                     <gmd:description>
                        <gco:CharacterString>Campagne à la mer : EVHOE 2009</gco:CharacterString>
                     </gmd:description>
                  </gmd:CI_OnlineResource>
               </gmd:onLine>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>https://doi.org/10.17600/8050040</gmd:URL>
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                     <gmd:protocol>
                        <gco:CharacterString>WWW:LINK</gco:CharacterString>
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                     <gmd:name>
                        <gco:CharacterString>Campagne à la mer : LANGOLF 2008</gco:CharacterString>
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                     <gmd:description>
                        <gco:CharacterString>Campagne à la mer : LANGOLF 2008</gco:CharacterString>
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               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>https://doi.org/10.17600/9050040</gmd:URL>
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                     <gmd:protocol>
                        <gco:CharacterString>WWW:LINK</gco:CharacterString>
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                     <gmd:name>
                        <gco:CharacterString>Campagne à la mer : LANGOLF 2009</gco:CharacterString>
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                     <gmd:description>
                        <gco:CharacterString>Campagne à la mer : LANGOLF 2009</gco:CharacterString>
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               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>https://doi.org/10.17600/7050060</gmd:URL>
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                     <gmd:protocol>
                        <gco:CharacterString>WWW:LINK</gco:CharacterString>
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                     <gmd:name>
                        <gco:CharacterString>Campagne à la mer : ORHAGO 2007</gco:CharacterString>
                     </gmd:name>
                     <gmd:description>
                        <gco:CharacterString>Campagne à la mer : ORHAGO 2007</gco:CharacterString>
                     </gmd:description>
                  </gmd:CI_OnlineResource>
               </gmd:onLine>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>https://doi.org/10.17600/8050120</gmd:URL>
                     </gmd:linkage>
                     <gmd:protocol>
                        <gco:CharacterString>WWW:LINK</gco:CharacterString>
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                     <gmd:name>
                        <gco:CharacterString>Campagne à la mer : ORHAGO 2008</gco:CharacterString>
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                     <gmd:description>
                        <gco:CharacterString>Campagne à la mer : ORHAGO 2008</gco:CharacterString>
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                  </gmd:CI_OnlineResource>
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               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>https://doi.org/10.17600/9050100</gmd:URL>
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                     <gmd:protocol>
                        <gco:CharacterString>WWW:LINK</gco:CharacterString>
                     </gmd:protocol>
                     <gmd:name>
                        <gco:CharacterString>Campagne à la mer : ORHAGO 2009</gco:CharacterString>
                     </gmd:name>
                     <gmd:description>
                        <gco:CharacterString>Campagne à la mer : ORHAGO 2009</gco:CharacterString>
                     </gmd:description>
                  </gmd:CI_OnlineResource>
               </gmd:onLine>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>https://doi.org/10.17600/10050090</gmd:URL>
                     </gmd:linkage>
                     <gmd:protocol>
                        <gco:CharacterString>WWW:LINK</gco:CharacterString>
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                     <gmd:name>
                        <gco:CharacterString>Campagne à la mer : ORHAGO 2010</gco:CharacterString>
                     </gmd:name>
                     <gmd:description>
                        <gco:CharacterString>Campagne à la mer : ORHAGO 2010</gco:CharacterString>
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                  </gmd:CI_OnlineResource>
               </gmd:onLine>
            </gmd:MD_DigitalTransferOptions>
         </gmd:transferOptions>
         <gmd:transferOptions>
            <gmd:MD_DigitalTransferOptions>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>https://doi.org/10.12770/2cbecf51-d5fa-46aa-8e52-b36a6f64f883</gmd:URL>
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                     <gmd:protocol>
                        <gco:CharacterString>DOI</gco:CharacterString>
                     </gmd:protocol>
                     <gmd:name>
                        <gco:CharacterString>DOI du jeu de données</gco:CharacterString>
                     </gmd:name>
                     <gmd:description gco:nilReason="missing">
                        <gco:CharacterString/>
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                  </gmd:CI_OnlineResource>
               </gmd:onLine>
            </gmd:MD_DigitalTransferOptions>
         </gmd:transferOptions>
      </gmd:MD_Distribution>
  </gmd:distributionInfo>
  <gmd:dataQualityInfo>
      <gmd:DQ_DataQuality>
         <gmd:scope>
            <gmd:DQ_Scope>
               <gmd:level>
                  <gmd:MD_ScopeCode codeListValue="dataset"
                                    codeList="http://standards.iso.org/iso/19115/resources/Codelists/cat/codelists.xml#MD_ScopeCode"/>
               </gmd:level>
            </gmd:DQ_Scope>
         </gmd:scope>
         <gmd:report>
            <gmd:DQ_AbsoluteExternalPositionalAccuracy>
               <gmd:evaluationProcedure/>
               <gmd:dateTime/>
               <gmd:result>
                  <gmd:DQ_ConformanceResult>
                     <gmd:specification>
                        <gmd:CI_Citation>
                           <gmd:title>
                              <gco:CharacterString>Inspire specifications</gco:CharacterString>
                           </gmd:title>
                           <gmd:date>
                              <gmd:CI_Date>
                                 <gmd:date>
                                    <gco:Date>2012-01-16</gco:Date>
                                 </gmd:date>
                                 <gmd:dateType>
                                    <gmd:CI_DateTypeCode codeList="http://standards.iso.org/iso/19139/resources/gmxCodelists.xml#CI_DateTypeCode"
                                                         codeListValue="creation">creation</gmd:CI_DateTypeCode>
                                 </gmd:dateType>
                              </gmd:CI_Date>
                           </gmd:date>
                        </gmd:CI_Citation>
                     </gmd:specification>
                     <gmd:explanation>
                        <gco:CharacterString>Non évalué</gco:CharacterString>
                     </gmd:explanation>
                     <gmd:pass>
                        <gco:Boolean>false</gco:Boolean>
                     </gmd:pass>
                  </gmd:DQ_ConformanceResult>
               </gmd:result>
            </gmd:DQ_AbsoluteExternalPositionalAccuracy>
         </gmd:report>
         <gmd:lineage>
            <gmd:LI_Lineage>
               <gmd:statement>
                  <gco:CharacterString>Quatre critères, issus des observations des campagnes scientifiques halieutiques, sont établis pour estimer la sensibilité des ressources halieutiques face aux extractions de granulats marins :
    - "Communauté" (campagnes CGFS, EVHOE, LANGOLF, ORHAGO , COPER, COMOR et COSB )
    - "Nourricerie" (campagnes Nurse Vilaine, Nurse Loire Gironde , PECOS, Baie de Seine, Baie de Somme, LANGOLF)
    - "Frayère" (campagnes IBTS et SOLDET)
    - "Diversité" (campagnes Baie de Seine, Baie de Somme, CGFS, EVHOE, LANGOLF, Loire-Gironde, Nurse, ORHAGO, PECOS)
Les individus prélevés lors des campagnes halieutiques sont déterminés (niveau espèce), comptés et mesurés. Un choix a ensuite été fait sur la liste des espèces à considérer pour cette étude.
Pour les critères "Communauté", "Nourricerie" et "Frayère",  les résultats des calculs d'abondances de ces espèces observées sont représentés selon une grille établie pour chaque campagne avec une résolution adaptée.
Pour le critère "Diversité", l'indice de Margalef, qui standardise la richesse spécifique par le nombre d'individus de l’échantillon pour chaque prélèvement, est également représenté selon une grille établie pour chaque campagne avec une résolution adaptée.

Les abondances sont ensuite moyennées par espèce ou groupe d'espèce, toutes campagnes confondues.
Les données de chaque critère sont classées par quartiles afin de les représenter sans masquer la variabilité spatiale. Une donnée de synthèse est générée pour chaque critère, en moyennant les quartiles. Puis une donnée de synthèse des ressources halieutiques est obtenue de la même façon, à partir des synthèses des quatre critères

Ces données, traitées dans l'environnement R, sont ensuite exportées vers ArcGIS pour les mises en forme et pour la gestion de la bancarisation dans Sextant.
Pour plus de détails, consulter les rapports disponibles sur le site https://sextant.ifremer.fr/fr/web/granulats-marins</gco:CharacterString>
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               <gmd:title>
                  <gco:CharacterString>Observation des ressources halieutiques par les campagnes scientifiques françaises</gco:CharacterString>
               </gmd:title>
               <gmd:date>
                  <gmd:CI_Date>
                     <gmd:date>
                        <gco:Date>2013-01-01</gco:Date>
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                  </gmd:CI_Date>
               </gmd:date>
               <gmd:otherCitationDetails>
                  <gco:CharacterString>Disponible sur le site Granulats marins https://sextant.ifremer.fr/fr/web/granulats-marins</gco:CharacterString>
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            </gmd:CI_Citation>
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         <gmd:portrayalCatalogueCitation>
            <gmd:CI_Citation>
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                  <gco:CharacterString>Espèces les plus vulnérables aux activités d'extraction de granulats marins</gco:CharacterString>
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               <gmd:date>
                  <gmd:CI_Date>
                     <gmd:date>
                        <gco:Date>2013-01-01</gco:Date>
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                     <gmd:dateType>
                        <gmd:CI_DateTypeCode codeList="http://standards.iso.org/iso/19139/resources/gmxCodelists.xml#CI_DateTypeCode"
                                             codeListValue="creation">creation</gmd:CI_DateTypeCode>
                     </gmd:dateType>
                  </gmd:CI_Date>
               </gmd:date>
               <gmd:otherCitationDetails>
                  <gco:CharacterString>Disponible sur le site Granulats marins https://sextant.ifremer.fr/fr/web/granulats-marins</gco:CharacterString>
               </gmd:otherCitationDetails>
            </gmd:CI_Citation>
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