Phytoplankton of the middle part of Southern Bug River is represented by 334 algae species (358 infr. taxa) including original and literature data. The basis of taxonomical structure consists of Chlorophyta (44.4 %), Bacillariophyta (22.8 %), Euglenophyta (10.8 %) and Cyanoprokaryota (10.4 %). Main genus are Desmodesmus, Euglena, Trachelomonas, Phacus, Monoraphidium, Nitzschia, Scenedesmus, Oocystis, Merismopedia, Microcystis. The change of taxonomical structure with the compare of literature data was noted. Thirteen species of algae, rare for Ukrainian flora, were revealed.
Keywords: algal flora, phytoplankton, taxonomical structure, Southern Bug River, middle part
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