Species composition of Cyanoprokaryota of the water bodies of Dniprovsko-Orilsky Natural Reserve totaled 120 species (124 taxa of infraspecific rank) which belonged to 33 genera, 13 families, 3 orders, and 2 classes. The highest number of species (115) was found in floodlands: 101 – in water bodies connected to the Dnipro River and 54 – in water bodies separated by the Dnipro River. Species diversity of the other types of water bodies was much lower. Seasonal dynamics of Cyanoprokaryota were retraced. In spring 44 species (45 infr. taxa) were found, in summer – 102 (106), and in autumn – 55. Some rare yet noteworthy species were revealed, namely, Pannus leloupii (Kuff.) Hindák – new species for the Ukraine, Bacularia vermicularis (Fedor.) Komárek et Anagn., and Tolypothrix distorta Kütz. – new for the steppe zone of the Ukraine, Chroococcus cohaerens (Bréb.) Nägeli, Oscillatoria redekei Goor and Nostoc entophytum Born. et Flah. – are rare for the steppe zone of the Ukraine.
Keywords: Cyanoprokaryota, algae, Dniprovsko-Orilsky Natural Reserve, types of water bodies, seasonal dynamics, rare species
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