La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Bryophytes and bryocoenosis of Entraygues site (Var, France) as a tool for evaluating a hydrologic renaturation project
Auteurs :	Vincent Hugonnot, Auteur
Type de document :	Article
Dans :	Ecologia Mediterranea (37(2) 2011)
Article en page(s) :	45-56
Résumé :	A survey of bryophytes and bryocoenosis of the Entraygues site (Var, France) allowed to draw up a list of 43 taxa among which 4 present a high patrimonial value: Barbula bolleana (Mull. Hal.) Broth., Cinclidotus danubicus Schiffn. & Baumgartner, Marchantia paleacea Bertol. and Tortella inflexa (Bruch) Broth. Five bryocoenosis were described and placed along a vertical transect: aquatic Fontinalis community, rheophilic Cinclidotus danubicus community, weakly rheophilous Barbula bolleana community, weakly hygrophilous Leicolea turbinata community and corticolous Dialytrichia mucronata community. The occurrence of species and communities rely on the type of the water supply of the site, i.e. karstic dominant, widely disconnected from Argens. Water supply of bryophytic habitats is cold, of relatively constant flow in the year, very mineralized and relatively oligotrophic unlike waters of Argens river. The preservation of this floristic and bryocenotic assemblage with high patrimonial value rests on the preservation of the feature of the hydrosystem. The site of Entraygues does not have to be reconnected because a contribution in water of the river would lead to the disappearance of these originalities.

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