The features of the spatial distribution of interstitial microalgae from natural and artificial beaches have been studied. Set to high level of similarity in species composition, and almost the same numbers of algae were determined on the beaches. It was found that microalgae on a sandy beach are distributed unevenly, depending on the horizon of sand and distance from the water toward the land. The stimulating effect of the pore (interstitial) water on the growth of psammon microalgae has been shown.

Keywords: interstitial zone, microalgae, resting spores, sandy beaches, Black Sea

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