p. 139 - 155 PHYTOPLANKTON DIVERSITY INDICED AS EUTROPHICATION INDICATORS OF THE ROMANIAN INSHORE WATERS Pia Elena Mihnea Romanian Marine Research Institute Constanta Abstract 1,396 phytoplanktonic samples were analysed during 1979-1983 and 1985. Structure peculiarities of the phytoplanktonic community as species number, dominance, total density, index of diversity, evenness, in an eutrophicated area are presented. The significance of diversity index (H') and the way of using it for a complete description of phytoplankton are discussed.