Phytoplankton Production and Decomposition Characteristics in the Water Bodies of the "Golosiyivsky" National Nature Park (Ukraine)

For the first time, a comparative study of the production and decomposition processes in plankton of the ponds of the "Golosiyivsky" National Nature Park (Ukraine), which are subjected to increased anthropogenic load to being located within the territory of metropolis (Kyiv), was performed. It has been shown that in general the biotic balance in most of the studied water bodies is positive as evidenced by the increase in the content of organic matter. The first and last ponds in the systems of the Gorikhovatka and Kytayevo ponds were the most productive, while in the intracascade ponds the amount of the total primary production was much lower. Among the Didorivka ponds, the last pond was characterized by the highest productivity, while in pond N 3 the processes of decomposition prevailed over the processes of production, which is evidence of the heterotrophic pattern of its ecosystem functioning. The increased positive biotic balance in most of the studied water bodies indicated that they are enriched with nutrients due to external inputs. The approach of the A/R value to 1 observed in some ponds of the studied systems is evidence of the intensification of self-purification processes. The identified changes in the production processes of the studied ponds are closely related to the content of photosynthetic pigments of phytoplankton, which is confirmed by the results of correlation analysis.