The paper deals with the results of original studies of phytoplankton, phytomicroepiphyton, phytomicroepiliton taxonomical diversity investigations from the headwaters of the Teterev River to the flow into the Kiev water reservoir, including the regulated river stretches and some of the tributaries. 692 species have been identified, represented by 871 infraspecific taxa including the nomenclative species type. In general, representatives of Chlorophyta, Bacillariophyta and Euglenophyta dominate in the river. Approximately 50‰ of species and infraspecific taxa in the Teterev River are identified for the first time. High level of species similarity in the river phytomicroepilliton and phytomicroepiphyton is established.

Keywords: taxonomical diversity, Teterev River, phytoplankton, phytomicroepiphyton, phytomicroepiliton

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