Abstract
The pore spaces (interstices) of marine sandy beaches are permanently filled with water and inhabited by the aquatic organisms originated from the sea, rivers and land soil. They are: bacteria, unicellular algae, fungi, their spores and cysts, protozoans, small invertebrates, which found favourable living conditions, in particular abundance of nutrients, absence of large consumers and propagate themselves here. Waves are a permanent factor of filling the interstices and it is presumed that the surplus of water with detritus particles and microscopic organisms is trickling out in the water edge zone. This is the reason of accumulation of young fishes and many species of invertebrates here. An important ecological function of sandy beaches is the production of bacteria, microscopic algae and animals and detritus particles. Therefore man-made change in the natural state of sandy beaches is an impact on littoral feeding grounds of invertebrates and fish, including commercially important species. The main tasks in the study of microscopic organisms of the Black Sea sandy beaches are proposed.
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