p. 55 - 68 DYNAMIQUE DES PRINCIPAUX PARAMETRES CHIMIQUES DE L'EAU DE MER DANS LA ZONE MANGALIA, PENDANT LA PERIODE 1970-1982 Iulia voinescu, Liliana Dorogan, Adriana Cociasu Institut Roumain de Recherches Marines Constanta Abstract The evolution of the salinity, dissolved oxygen and nutrient salt content in the shallow Black Sea waters at Mangalia during 1970-1982 are presented. The observed seasonal variations are discussed in relation with the hydrological and anthropic factors and with the biological cycle of the area.