p. 119 - 130 SUR LA COMMUNAUTE ZOOPLANCTONIQUE D'UN MILIEU PORTUAIRE - L'AIRE PORTUAIRE DE CONSTANTA (MER NOIRE) Adriana Petran Institut Roumain de Recherches Marines Constanta Abstract The paper is based on the results of the observations carried out in the waters of Constanta harbour in a fixed station between 1978-1982 and in 10 stations in 1982 (April, June, August). The structure of zooplank- tonic communities is characterized by low specific diversity; only a few opportunistic species-e.g. Pleopis polyphemoides and Acartia clausi formed abundant populations.