Species composition of the heterotrophic microbial communities of Lake Vishtynetskoe of the Kaliningrad region in June 2022-2023
https://doi.org/10.46845/1997-3071-2025-79-39-53
Abstract
Lake Vishtynetskoye is the largest and deepest lake in the Kaliningrad region, and it is a part of the Vishtynetsky Nature Park. According to the hydrochemical indicators, the lake is classified as oligotrophic with some mesotrophic characteristics in the coastal areas. The purpose of our study was to determine the species composition of the heterotrophic microbial communities in Lake Vishtynetskoe and to identify the physiological groups of bacteria involved in the transformation of organic compounds. The material of the research was heterotrophic bacterioplankton from Lake Vishtynetsky in June 2022-2023. During the study period, the average number of heterotrophic bacteria did not exceed 0,7× 103 CFU/ml, which is typical for oligotrophic water bodies. No clear differences in the number of heterotrophs between the years of the study were found. Changes in the number of heterotrophs at the sampling stations, with the highest microbial number in the shallow, well-heated areas of the lake and the lowest in the deep-water zones were revealed. We also found a similar pattern of fluctuations in the number of heterotrophs depending on the water temperature at the observation stations. In the microbial communities of Lake Vishtynetsky, there are species of bacteria that actively ferment carbohydrates, break down proteins, and reduce nitrates to form molecular nitrogen. The abundance of bacteria that decompose a wide range of carbohydrates and the polyatomic alcohol mannitol is significant. Rod shape bacteria as Aeromonas, Enterobacter, Bacillus, Pseudomonas, coccus bacteria as Staphylococcus, Sarcina were in water microflora. The uniformity of the microbial community structure and its biochemical activity indicate the self-purification processes in Lake Vishtynetskoe.
About the Author
А. I. Moiseeva
Kaliningrad State Technical University
Russian Federation
Russian Federation
Anastasiya I. Moiseeva – Postgraduate Student of the Department of Aquatic Bioresources and Aquaculture,
Kaliningrad.
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For citations:
Moiseeva А.I. Species composition of the heterotrophic microbial communities of Lake Vishtynetskoe of the Kaliningrad region in June 2022-2023. KSTU News. 2025;(79):39-53. (In Russ.) https://doi.org/10.46845/1997-3071-2025-79-39-53
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