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REMARQUES SUR LA STRUCTURATION DES POPULATIONS
ZOOPLANCTONIQUE DANS LES ZONES DES EMISSAIRES
D'EAUX USEES DU LITTORAL ROUMAIN DE LA MER NOIRE


Adriana Petran
Institut Roumain de Recherches Marines Constanta 


Abstract
The paper presents the structural evolution of zooplank-
tonic communities in inshore waters of the southern part
of the Romanian coast, close to industrial and domestic 
waste-water effluents. 260 samples were analysed and the
results processed statistically (index of diversity, index
of dominance, frequency of different species), showing
consequence of eutrophication and local pollution on the
structural pattern of zooplanktonic communities in shallow
waters. Depletion of communities becomes expressed both by 
their qualitative and quantitative scarcity within the
contact zone between the effluent fan and the receptor
seawater mass, allowing survival of two of the most
opportunistic species: Acartia clausi and Pleopsis poly-
phemoides. Structural parameters present significant
dependence on seasonal influences during the whole cycle,
as for instance in summer, when 1-2 species could from
rich populations, organised oftenly even at monospecific
level.