LES CHAMPIGNONS DES DUNES NON BOISÉES DU LITTORAL AQUITAIN : UN UNIVERS MÉCONNU!

To introduce scientific data in a field until now slightly investigated, a synthesis of twenty years researches about the mycoflora of atlantic sand dunes of coastal Aquitaine is given. A great fungal biodiversity was found. The distribution of species number observed appeared to be correlated with an edaphic caesura localized in "Bas-Médoc". This work not only reveals the existence of unknown, uncommon, or critical species but also trophic specialization and adaptation of this species which constituted true mycocoenoses, having spatio-temporal distribution through the transversal section of the dune (white or black dunes). For better understanding of the relationships between the observed species, the ecodynamic equilibrium between the mycocoenoses were studied in correlation with the geomorphologic evolution of the wind sand environment. Finaly, fungi of dune appear to play a role of bio-indicator and therefore could be used like the vegetation to evaluated the "state of health" of the ecosystem of the dune. [ABSTRACT FROM AUTHOR]