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                              <gco:CharacterString>RÈGLEMENT (UE) N o 1089/2010 DE LA COMMISSION du 23 novembre 2010 portant modalités d'application de la directive 2007/2/CE du Parlement européen et du Conseil en ce qui concerne l'interopérabilité des séries et des services de données géographiques</gco:CharacterString>
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L’indice utilisé est le VDSI (Vas Deferens Sequence Index), il correspond à la moyenne des différents stades d’évolution de l'Imposex chez les femelles en utilisant une échelle de Vas Deferens Sequence (VDS) allant de 0 à 6 (le stade 6 conduisant à une infertilité de l’individu). Le bon état écologique est atteint lorsque le VDSI est inférieur à l’EAC (Environmental Assessment Criteria). Le seuil EAC a été développé par le groupe de travail CIEM/OSPAR «  Study group on integrated monitoring of contaminants and biological effects ». 
L’évaluation de l’Imposex est effectuée au niveau individuel dans le cadre du ROCCH et les analyses sont réalisées par le laboratoire Toxem basé au Havre.
Les données sont bancarisées dans la base de données Quadrige et transmises à OSPAR. L’évaluation OSPAR IA 2017 est reprise pour l’évaluation DCSMM 2018.</gco:CharacterString>
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