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            </gmd:DQ_Scope>
         </gmd:scope>
         <gmd:lineage>
            <gmd:LI_Lineage>
               <gmd:statement xsi:type="lan:PT_FreeText_PropertyType">
                  <gco:CharacterString>Les échantillonnages correspondent à des traits de filet Manta (complétés par des prélèvements d’eau environnante) réalisés à deux temps, les 21 octobre 2015 et 9 décembre 2015, et dans deux sites de la rade de Brest, proche de la marina récréative correspondant à une zone soumise à fortes activités anthropiques, et en centre de la baie dans un zone caractérisée par l’existence d'un vortex temporaire créé par le courant de surface à marée montante concentrant les débris flottants provenant du nord et du sud de la baie (Frère et al., 2017). Au sein de chaque échantillon, les particules ont été analysées par spectroscopie Raman permettant de discriminer le type de polymère et la taille (Frère, 2017). Les microplastiques ont été poolés en fonction de la zone et du temps de prélèvement, du polymère (polyéthylène (PE), polypropylène (PP) et polystyrène (PS)) et la classe de taille (0,3-1 vs. 1-2 vs. 2-5mm), soit 47 échantillons de microplas tiques et 12 échantillons d’eau de mer filtrée qui ont été étudiés pour leurs assemblages bactériens par séquençage de l'amplicon 16S.

Figure : Cladogramme des résultats LEfSe selon les types d'échantillons (microplastiques et eau de mer) pour les échantillons prélevés en rade de Brest en octobre 2015. Les genres bactériens Litoreibacter et Vibrio apparaissent biomarqueurs des microplastiques collectés en rade de Brest (Frère , 2017).

Référence :
Frère Laura (2017) Les Microplastiques sont-ils une menace en rade de Brest ? Thèse de l’Université de Bretagne Occidentale, 301pp.

Financements : La thèse de Laura Frère effectué au sein du LEMAR (CNRS/UBO/IRD/IFREMER) a été financée par Brest métropole et l’Université de Bretagne Occidentale et a eu le soutien des projets Interreg Micro (2012-2014), CRD-ANSES (2015-2017) et FUI20 Microplastiques2 labélisé Pôle Mer (2016-2019).</gco:CharacterString>
               </gmd:statement>
            </gmd:LI_Lineage>
         </gmd:lineage>
      </gmd:DQ_DataQuality>
  </gmd:dataQualityInfo>
</gmd:MD_Metadata>