This review presents the current taxonomic structure of phytoplankton found in continental aquatic ecosystems of Ukraine. The results of studies undertaken between 2000-2022 are analyzed. The hydroecosystems under study include Kaniv Reservoir, the Western Bug and the Pripyat rivers with tributaries, the Sula River in the borders of the Nyzhnyosulsky National Park, city ponds of Gostomel, and large Danube lakes. During this period, 455 species of algae were identified in the phytoplankton of studied ecosystems, represented by 467 infraspecific taxa (ist) from 206 genera, 102 families, 53 orders, 18 classes and 8 divisions. The most diverse were Bacillariophyta (25-50), Chlorophyta (22-39) and Cyanobacteria (7-16 of species diversity). It is established that one response of phytoplankton to modern climate change is an increase in the share of Cyanobacteria. The taxonomic diversity of algae with a rank higher than the species characterized by the following regression dependence: Bacillariophyta Chlorophyta Cyanobacteria Ochrophyta Euglenozoa. Analysis of the taxonomic composition of Bacillariophyta at different levels of their systematic hierarchy (families, genera - by the Kendel coefficient; species (ist) - by the Sørensen coefficient) allowed us to establish the following patterns. The Kendel coefficient for the leading families ranged from 0.31 to 0.72. The greatest degree of similarity was observed in lotic aquatic ecosystems. The Kendel coefficient for the leading genera ranged from 0.11 to 0.59. The greatest similarity in floristic structure was observed between ecosystems of the same type, such as lotic systems (The Pripyat and Western Bug rivers) or lentic systems (The Gostomel ponds and the large Danube lakes). Cluster analysis of species similarity using the Sørensen coefficient, with construction of the corresponding dendrogram, revealed a clear separation into two distinct clusters: lentic and lotic ecosystems. Analysis of long-term data on the taxonomic composition of phytoplankton (algae present in the water column at the time of sampling) indicates a high level of diversity across different types of hydroecosystems in Ukraine.
Davydov et al. (Thu,) studied this question.