The paper presents the results of the study of abundance, biomass, mean cell volume and secondary production of bacteria inhabiting a marine-bay sandy beach, at southern Baltic Sea coast (Sopot) in summer season. The differences of bacteriological parameters among sites across beach horizontal profile were determined. Maximal value of the total bacteria numbers (8.59 [plus or minus] 0.73 x 10[^7]cells g[^-1] dw), biomass (15.2 [plus or minus] 4.4 [my]g C g[^-1] dw) and cell volume of bacterium (0.056 [plus or minus] 0.011 [my]m3) was noted at the waterline and bacterial secondary production was highest in the dune (172.3 [plus or minus] 86.6 [my]g C g[^-1] dw d[^-1]) and at the waterline (119.9 [plus or minus] 40.5 [my]g C g[^-1] dw d[^-1]). Marked differences in the level of bacteriological parameters between surface and subsurface sand layers were estimated. In the sea, at the waterline and in the middle of the beach higher numbers of bacteria, their biomass and secondary production were found in the surface (0.1 cm) than in the subsurface (5.10 cm) sand layers. A reverse situation was observed in the dune.
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The abundance of culturable heterotrophic microorganisms (bacteria, fungi, yeasts, actinomycetes) and their spatial and vertical variability were studied in marine-bay ("Sopot") and open-sea ("Czołpino") sandy beaches (southern Baltic Sea). Among studied microorganisms, halotolerant (13.4 - 308.4 x 10[^3] CPU g[^-1] dry wt of sand) and limnotolerant (7.4 - 69.2 x 10[^3] CPU g[^-1] dry wt. of sand) bacteria predomi.nated in the sand of both beaches. Filamentous fungi, yeasts, and actinomycetes constituted only a slight percentage (0.2-3.0%) of all isolated heterotrophic microorganisms. The numbers of all studied microorganisms were much higher on marine-bay beach characterized by a high level of accumulation of organic matter (4.1 mg g[^-1] dry wt. of sand) than in the sand of the open-sea beach, where the content of organic matter was lower (1.9 mg g[^-1] dry wt. of sand). There were marked differences in the horizonatal profile distribution of heterotrophic microorganisms inhabiting marine-bay and open-sea beaches. In both studied beaches higher numbers of microorganisms were determined in the surface (0-5 cm) than in subsurface (5-10cm) sand layer.
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