Structure of the microbial community of the Verkhniy pond (Kaliningrad)
https://doi.org/10.46845/1997-3071-2023-71-24-37
Abstract
The formation of water quality in the reservoir and watercourses of the Verkhniy pond basin is caused by complex processes and is influenced by numerous natural and anthropogenic factors. The speed of metabolism and the short time of generation of microorganisms allow them to react to changing environmental conditions much faster than other components of biota. As a result of the analysis of the structure of the microbial community of the Verkhniy pond, heterogeneity of microbial populations has been revealed. Gram-negative bacteria of the families Enterobacteriaceae, Pseudomonadaceae, Vibrionaceae have been found in the composition of the bacterioflora of water. Gram-positive microflora included microorganisms of the genera Bacillus, Micrococcus, Staphylococcus. Gram-negative rod-like bacteria of the genus Pseudomonas, belonging to group 4 «Gram-negative, aerobic/micro-aerophilic rods and coccus», subgroup 4A, were widely distributed in microbial populations. Significant changes in microorganism communities (increase in the proportion of gram-negative bacteria) have been noted. The number of rod-like bacteria of the genus Aeromonas peaked in May 2023 (74.94 % of all isolated bacterial strains). The change in the structure of microbial communities towards an increase in the proportion of gram-negative bacteria indicates a pronounced anthropogenic pressure. The numbers of heterotrophic bacteria utilizing readily available organic matter in water ranged from 1,2х103 to 4,2х104 CFU/ml. The highest levels have been observed near the estuary of the Botanical Stream, indicating a high content of organic matter in the water. An increase in the number of heterotrophic bacterioplankton may be an indirect indicator of incomplete destruction, incomplete transformation of organic matter entering the watercourse, including anthropogenic origin. In the microflora of the water of the Verkhniy pond, the presence of sanitary-significant bacteria of the fecal group, which belong to the indicators of sanitary malaise of the aquatic environment has been detected.
About the Author
A. I. MoiseevaRussian Federation
Anastasiya I. Moiseeva, Postgraduate student
Department of Aquatic Bioresources and Aquaculture
Kaliningrad
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Review
For citations:
Moiseeva A.I. Structure of the microbial community of the Verkhniy pond (Kaliningrad). KSTU News. 2023;(71):24-37. (In Russ.) https://doi.org/10.46845/1997-3071-2023-71-24-37