The ecological state of the Schoenflies pond as the example of a quarry-type reservoir's description under conditions of recreational load

   The purpose of this study was to assess the ecological state of a floated quarry based on the results of integrated observations during a period of increased recreational load. In 2019, during field trips, 33 water samples were taken at three shore stations of the Schoenflies pond.

   Based on the results of the hydrochemical, microbiological and algological analyzes, conclusions were drawn about the ecological state of the studied reservoir. According to hydrochemical indicators, a discrepancy between the oxygen content and standard values with a pronounced difference between stations was found. Nutrients dissolved in water is within MPC. According to sanitary and microbiological analyzes, contamination of water was low. Composition of the aquatic microflora of the Schoenflies pond throughout the entire observation period was formed by aerobic and facultative anaerobic rod-shaped (62 %) and coccal bacteria (38 %). The largest number of bacterial species was observed in summer and autumn. The basis of the algoflora complex of the pond was formed by 75 species and taxa up to the genus of departments. The average number of phytoplankton during the observation period varied within 0.3–3.7 million cells/l, biomass – 0.5–4 mg/l. The peak of algae development was observed in September. According to the results of comprehensive research, water of the Schoenflies pond belongs to the category of pure water. The results of the hydrochemical monitoring for most parameters comply with the established ranges for mesotrophic water bodies (according to the saprobity class, oligosaprobic waters). The results obtained suggest that the recreational load, even in the absence of flow, is not a determining factor in changing the ecological state of the pond in summer.

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