Structure of Zooplanktocenoses of Water Bodies of Zoogenic Origin of Different Types in a Specially Protected Natural Territory

The features of the structure of zooplankton in beaver ponds and the course of successions in zooplanktocenoses have been studied in the Kologrivsky Forest State Natural Reserve. Ponds are divided into groups according to the nature of the watercourse on which they are formed, the height of the floodplain, and the duration of existence. The seasonal succession of zooplankton for all types of ponds begins with the predominance of juvenile stages of Copepoda. In the summer, in newly formed ponds and in ponds on rivers with high floodplains, a typical zoogenic transformation of communities is observed that occurs with the development of large Cladocera. In long-term ponds on streams and in rivers with low floodplains, the dominance of Rotifera and small Cladocera (which are characteristic of anthropogenic eutrophication) and the highest average values of abundance and biomass, indices of species diversity, and evenness are noted.