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Abstract
From the analysis of the results of several researches carried out into Sicilian reservoirs to investigate their phytoplankton assemblages, it was highlighted that there is not any clear relationship between the trophic spectrum and the structure and composition of phytoplankton. Only a general increase of total biomass is detectable as the trophic state rises up. Anyway, such increase may cause several secondary modifications in the physical and chemical environment that may act as multidimensional segregating factors for phytoplankton organisms. In these secondary modifications, coupled with the peculiar morphology and hydrology of the water bodies, have to be sought the mechanisms governing the structure of phytoplankton assemblages.