p. 223 - 231 ETUDE SUR LES COMMUNAUTES DES CHAMPIGNONS COMME CONSEQUENCES DE L'ACTION DES PARAMETRES PHYSIQUES ET CHIMIQUES DE LA ZONE DE INFLUENCE DU DANUBE INFERIEUR Mukader Apas et Icmet Bilal Institute Roumain de Recherches Marines Constanta Abstract The frequence and the density of fungs are discussed as a result of some special concentration of nitrogen, phosphorus and organic substances. Temperature, salinity and the level of oxygen are implied, too, concerning the spors densities, throughout taxonomic groups ratio, essentially explained by yeasts development. The present study is including all chemical and biological observations, during 1978 to 1980.