While long-termed investigating structure-functional features of the summer macrophytobenthos were highlighted as well as its fluctuations within the off-shore ecotone of the Black Sea. It was shown, that the most of ground phytocenosis features were undergone interannual wide range changes to be far fewer than that estimates indicating a stable level. A character of changes and the fact that more than a half of species have been constantly forming phytocenosis within different years enable to consider the state of macrophyte link as dynamically steady one to provide the whole biosystem with stability in time.

Keywords: macrophytes, Black Sea, off-shore ecotone, fluctuations, ecology-taxonomical diversity, biomass

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