Sanitary and microbiological characteristic of aquatic bio resources habitat in Lake Ladoga
https://doi.org/10.36038/2307-3497-2021-185-94-104
Abstract
The microbiological characteristic of Lake Ladoga water masses as a habitat for bioresources, based on the results of observations in June and September 2020, is presented. At the beginning of summer, a heterogeneous spatial distribution of bacterioplankton was observed, because of the water temperature discrepancy in different regions. The maximum values of the total bacterial counts (TBC) were discovered in the southeastern coastal area and the area of the Sortavala skerries, whereas the minimum values were found in the deep-water region. In autumn, the distribution of bacterioplankton was rather uniform due to the equalization of water temperatures in the surface layer. The average values of the TBC during the observation period indicate that the trophic state of the various areas of the lake ranged from oligotrophic in Petrokrepost Bay to mesotrophic-eutrophic in the southeastern region and Sortavala skerries. According to the numbers of saprophytic microorganisms (SM), the water masses of the lake, except for the skerries, were identified as “clean” and “very clean”, which corresponds to xeno — and oligosaprobic waters. The amount of total coliform bacteria (TCB) and thermotolerant coliform bacteria (ThCB) was significantly lower than the standards established for different categories of water use. The exception was the site at the mouth of the Volkhov River in June, where the number of TCB and ThCB exceeded the norms by an order of magnitude, indicating the presence of fecal contamination. The presence of salmonella in the water masses was not detected. The values of microbiological parameters indicate high water quality in most regions of Lake Ladoga. However, some areas of environmental risk due to anthropogenic impact have been identified: the Volkhov Bay, including the mouth of the Volkhov River, areas in the skerries near the cities of Sortavala, Lakhdenpokhya, and Pitkyaranta, and the water area beside a city of Priozersk.
About the Authors
D. V. Belozerova
St. Petersburg Branch of VNIRO («L.S. Berg «GosNIORKh»)
Russian Federation
Russian Federation
St. Petersburg
L. L. Kapustina
St. Petersburg Branch of VNIRO («L.S. Berg «GosNIORKh»); Institute of Limnology RAS
Russian Federation
Russian Federation
St. Petersburg
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Review
For citations:
Belozerova D.V., Kapustina L.L. Sanitary and microbiological characteristic of aquatic bio resources habitat in Lake Ladoga. Trudy VNIRO. 2021;185:94-104. (In Russ.) https://doi.org/10.36038/2307-3497-2021-185-94-104
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