The current study presents data from
research conducted in Mangalia military port, in
the period November 2008 - February, March, and
April 2009.
An analysis of percentage composition of
the invertebrates’ populations is done in the paper.
Taxa belonging to at least 10 major groups were
found, either on mobile substrata, either on rocky
one, sometimes covered with macrophyte algae.
The data were used in the evaluation of some
synecological indices, as frequency (F %), average
density (D avg ind. • m-²), for each of the studied
stations.
Correlation between variation of the
number of taxa and density depending on type of
substrata was done.
The ecological significance index WD and
its correlation with the rank was also calculated,
showing that, in the studied area, oligochaetes,
nematodes and harpacticoids are considered as
characteristic groups, holding, in order, the first
three ranks. | 
