p. 151 - 171 DYNAMIQUE SAISONNIERE DES POPULATIONS D'AMPHIPODES DES CHAMPS A CYSTOSEIRA BARBATA (AG.) DU LITTORAL ROUMAIN DE LA MER NOIRE Victoria Tiganus Institut Roumain de Recherches Marines Constanta Abstract Seasonal variations of the qualitative and quantitive composition of the Amphipoda fauna living in the Cystoseira barbata weadows and the population structure dynamics of the most abundant species, viz. Erichtonius difformis, Amphithoe vaillanti and Jassa ocia, are analysed in the paper.