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Le macrozoobenthos regroupe l'ensemble des petits animaux aquatiques qui vivent sur le fond de la rivière : larves d'insectes, mollusques, crustacés, vers,\u2026Ils intègrent à la fois la qualité physico-chimique de l'eau, l'hydrologie et également la morphologie du cours d'eau.

Cette couche représente l'état biologique des dernières campagnes de prélèvement hivernaux (février-mars) qui diagnostique le meilleur potentiel écologique de la station.

Les résultats sont répartis en 5 classes d'état biologique en fonction de la diversité des organismes échantillonnés et de leur sensibilité aux pollutions :

Valeur de l'IBCH ➜ Etat Biologique:

0.8 - 1 ➜ Très bon état
0.6 - 0.79 ➜ Bon état
0.4 - 0.59 ➜ Etat moyen
0.2 - 0.39 ➜ Etat médiocre
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