Abstract.The estuarine ecosystem of the Amvrakikos Gulf, a semi‐enclosed embayment of the Ionian Sea, was surveyed at 9 stations in June, 1980. Quantitative and qualitative relationships among the phytoplanktonic, zooplanktonic and benthic populations were examined and related to environmental parameters. It was found that quantitative maxima of each of the three components occurred at different stations. When stations were grouped according to a similarity index of each community, it could be shown that the stations were very similar with regard to phytoplankton and slightly less similar with regard to zooplankton. The stations differed considerably as far as the benthos is concerned. The phytoplankton also exhibited a lower species diversity (0.08‐0.82 bits‐indiv.‐1) than the zooplankton (1.08‐2.10 bits indiv.‐1) and the benthos (0.85‐5.06 bits indiv.‐1). Differences in salinity among stations showed no significant correlation with the abundance or species diversity of phytoplankton, zooplan
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