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                  <gco:CharacterString>La donnée "résultats" a été produite à partir des données sources de recensement décennaux des oiseaux marins nicheurs (ROMN). La présence/absence des espèces a été déterminée selon un maillage de 5km x 5km sur l’ensemble du littoral de France métropolitaine, à partir des données de recensement national des oiseaux marins nicheurs (ROMN) coordonnés par le GISOM, en ne retenant que les colonies d’oiseaux marins localisées sur la côte ou dans les limites des communes littorales. Au total, 6 recensements des oiseaux marins nicheurs ont désormais été réalisés au cours des dernières décennies : 1968-1970, 1977-1979, 1987-1989, 1997-2000, 2009-2012 et 2020-2022. Nous avons choisi de ne conserver que les données des deux dernières éditions, i.e. 2009-2012 et 2020-2022, pour respectivement caractériser la distribution historique (« de référence ») et actuelle (« d’ évaluation ») des oiseaux marins. Bien que les données d’avant 2009 auraient pu fournir un état de référence plus ancien, le ROMN 2010 (années ‘2009-2012’) apparaît le plus exhaustif des recensements historiques en terme de couverture spatiale, et donc le plus adapté pour une comparaison aux données de distribution actuelles des populations (ROMN 2020 : années ‘2020-2022’). La distribution spatiale des espèces est évaluée à partir d’une mesure du taux d’occupation, i.e. une mesure du pourcentage de mailles où l’espèce est présente parmi l’ensemble des mailles « disponibles » pour l’espèce (i.e. propice à son installation en tant que nicheuse) dans l’UMR. Bien que le protocole du ROMN se veuille exhaustif, signifiant que l’on peut considérer l’ensemble des mailles de communes littorales comme prospectées/surveillées, il n’apparait pas pertinent de considérer toutes ces mailles surveillées comme « disponibles » pour chacune des espèces. Nous avons donc choisi de considérer comme mailles disponibles pour une espèce, l’ensemble des mailles sur lesquelles l’espèce a déjà été recensée au moins une fois comme nicheuse depuis le début des suivis ROMN. Le nombre de mailles disponibles par SRM est donc propre à chaque espèce.
La méthode d’évaluation de la distribution des oiseaux marins nicheurs utilisée s’appuie sur les travaux de Mitchell et al. (2018) dans le cadre de leur étude pilote : https://moat.cefas.co.uk/biodiversity-food-webs-and-marine-protected-areas/birds/distribution/</gco:CharacterString>
               </gmd:statement>
               <gmd:source uuidref="ebe41160-e151-4635-ae5a-d9c8ce91d1ab"
                           xlink:title="Productivité de la reproduction des couples d'oiseaux marins"
                           xlink:href="https://sextant.ifremer.fr/geonetwork/srv/fre/csw?service=CSW&amp;request=GetRecordById&amp;version=2.0.2&amp;outputSchema=http://www.isotc211.org/2005/gmd&amp;elementSetName=full&amp;id=ebe41160-e151-4635-ae5a-d9c8ce91d1ab"/>
            </gmd:LI_Lineage>
         </gmd:lineage>
      </gmd:DQ_DataQuality>
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