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Le projet Biomonitoring "Effet des arasements sur les communautés animales et végétales de la Sélune" a pour principal objectif de réaliser un état de référence de la qualité biologique de la Sélune à l’amont et à l’aval des deux barrages ainsi que dans les retenues. Il vise également à identifier les risques (exposition aigüe) pendant les travaux de fixation des boues contaminées de l’Yvrande.

Objectifs

Répondre aux questions :

Comment l'écosystème lotique se restaure-t-il après disparition d'un lac de barrage, et quels nouveaux équilibres écologiques en résultent ?
Quels seront les effets des travaux d'arasement sur la qualité des milieux et leurs conséquences sur les biocénoses qui s'y développent ?

Méthodes : IBMR ; IBGN ; IBD ; suivi des biofilms ; caractérisation physico-chimique

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Suivi des conditions physico-chimiques (t°c, conductivité, pH...)
Concentration en nitrates, silicates, azote et phosphore total
Suivi des communautés d’invertébrés
Suivi des communautés de phyto- et zoo-plancton, et mesure de la biomasse de phytoplancton
Suivi du biofilm (2015 à 2017)
Suivi des plantes aquatiques (1996)
Relevés floristique des plantes aquatiques (2015, 2017)</gco:CharacterString>
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            <gco:CharacterString>Entre octobre 2014 et avril 2016, les macroinvertébrés benthiques ont été prélevés à l'aide d'un épuisette de type Surber (0,05 m², mailles de 0,5 mm). Douze échantillons par station et par date ont été prélevés sur le terrain, selon un échantillonnage stratifié couvrant chaque habitat représentatif présent sur la station, conformément au protocole normalisé NF T 90-333 pour l'échantillonnage des invertébrés benthiques dans les cours d'eau praticables à pied, afin d'évaluer la qualité des cours d'eau conformément à la directive-cadre sur l'eau (2000/60/CE). Nous avons adapté le protocole aux stations plus profondes (S2, S3 et S4) en effectuant toujours l'échantillonnage à une profondeur praticable (~1 m) près de la rive, avec au moins 9 échantillons prélevés dans chaque habitat de la zone littorale du réservoir afin de garantir le calcul de l'indice IBGN français. Pour chaque échantillon, les organismes ont été triés à l'aide d'un stéréomicroscope et identifiés au niveau de l'espèce ou du genre (la plupart des crustacés et des larves d'insectes, Tachet et al., 2000), à l'exception des Nematoda, des Hydracarina (non identifiés plus précisément) et de la plupart des Diptera (identifiés au niveau de la famille), puis comptés.</gco:CharacterString>
          </gmd:statement>
        </gmd:LI_Lineage>
      </gmd:lineage>
    </gmd:DQ_DataQuality>
  </gmd:dataQualityInfo>
</gmd:MD_Metadata>

