Sixty-seven cases of water bloom were registered in ephemeral water bodies of city Kiev during 10 years of the investigation. Sixty species of algae (mainly green flagellate) were found; among them 35 species attributed to the agents of water bloom; in addition 2 species are new for flora of Ukraine, 4 – rare and interesting records, 2 – new for science taxa. Ephemeral water bodies are extreme habitats, because they are characterized by unstable conditions and limited existence time. Therefore, algal species, inhabited there, are characterized by some life strategies: life cycles with alternation of active vegetation and rest state, polycyclicity of development, presence of diapausal states, ability to active movement of vegetative cells and zygotes. These and other peculiarities of algae of ephemeral water bodies, the reasons of their mass development, dynamics and specificity of species composition depended on effect of biotic and abiotic factors are discussed as the example of observations on these water bodies of city Kiev.

Keywords: green water bloom, ephemeral water bodies, agents of water bloom, extreme habitats, unstable water regime, life strategies of hydrobionts, biotic and abiotic factors

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