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Assessment of the Status of the Kamianka River Aquatic Ecosystem in the Bila Tserkva Dis trict, Kyiv Region

A comprehensive assessment of the ecological status of the Kamianka River in the Bila Tserkva District, Kyiv Region (villages of Pyshchyky and Fursy) was conducted using bioindication methods, hydrochemical analysis, and radiological monitoring. Fluctuating asymmetry of meristic traits in the Prussian carp (Carassius gibelio) was employed as a bioindicator method for evaluating water quality. Hydrochemical parameters of water, including pH, total dissolved solids (TDS), and oxidation-reduction potential (ORP), were determined. In addition, the specific activity and density of radioactive contamination in the riparian zone by ¹³⁷Cs and ⁹⁰Sr were assessed. The study was carried out in April 2025, a period characterized by gradual temperature increase and the absence of peak eutrophication processes. At the same time, intense precipitation combined with surrounding agricultural landscapes posed a potential ecological risk. The study objects included water and riparian soil samples, bottom sediments, and a bioindicator—the typical hydrobiont, Prussian carp (Carassius gibelio). It was found that TDS values below the dam were statistically higher, although they remained within the permissible limits. The pH values indicated normal environmental conditions, assessed as “good.” The measured ORP (176–185 mV) reflected an oxidative geochemical environment, indicating the presence of dissolved oxygen in the water, particularly below the dam, and the presence of several elements in their highest valence states. Fluctuating asymmetry analysis of Prussian carp development revealed that even under relatively safe hydrochemical conditions, environmental factors negatively affected the hydrobionts during the study period. These findings underscore the necessity of conducting detailed laboratory analyses (molecular and biochemical), as well as repeated studies in other periods of the year, particularly during peak eutrophication events. The presence and density of contamination by long-lived, biologically active radionuclides ¹³⁷Cs and ⁹⁰Sr in the riparian zone of the Kam’yanka River were determined at four locations in the villages of Pyshchyky and Fursy, Bila Tserkva District, Kyiv Region. Radioactive contamination was found to be mosaic in nature; however, soil contamination levels did not exceed critical thresholds and corresponded to conditionally clean areas.

Keywords: ecotoxicant, ecological status, aquatic ecosystem, hydrobionts, water quality, ORP, TDS, pH, radionuclides ¹³⁷Cs and ⁹⁰Sr, riparian zone, bioindication.

VERED P. https://orcid.org/0000-0001-6548-4622


HERASYMENKO V. https://orcid.org/0000-0002-5678-9624


BITYUTSKII V. https://orcid.org/0000-0002-2699-3974


PRYSYAZHNYUK N. http://orcid.org/0000-0002-4737-0143


TSEKHMISTRENKO S. https://orcid.org/0000-0002-7813-6798


KUNOVSKYY Y. https://orcid.org/0000-0003-2720-3927


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BTF №2 2025