Bacterioplankton status in the Lososinka River (a tributary of Lake Onego) and water quality by microbiological indicators

Autor: E. M. Makarova, E. V. Tekanova, N. M. Kalinkina
Rok vydání: 2022
Předmět:
Zdroj: Povolzhskiy Journal of Ecology. :292-306
ISSN: 2541-8963
1684-7318
Popis: The results of our bacterioplankton study (total abundance; saprophytic, hydrocarbon oxidizing and phenol resistant bacteria; total microbial number, and coliform bacteria) in an urbanized tributary of Lake Onego in 2015 are presented. The lower reaches of the Lososinka River flow across the territory of Petrozavodsk city (Karelia) and receive 14 untreated drains of the urban storm sewers. Differences in the temporal abundance dynamics of bacteria which are the indicators of oil pollution, sanitary condition and saprobity were found in the reference and urban parts of the river. These changes are not related to the hydrological and temperature regime of the river and reflect the influence of the pollutant drainage from the urban area on the formation of the river bacterial community. A significant increase in all studied indicators of the quantitative development of bacterioplankton in the urban part of the river as compared to the reference part was revealed. The number of heterotrophic bacteria of various ecological-trophic groups decreases in the lake water by 8–16 times due to dilution, as early as 500 m from the mouth of the river. A significant decrease in the numbers of hydrocarbon oxidizing bacteria in the river water and an increase in sanitary-indicative microorganisms are shown to occur over four years. The Lososinka River on the territory of the Petrozavodsk city is assessed as polluted with oil products and organic matter of fecal origin and unsuitable for recreation according by the level of indicator bacteria.
Databáze: OpenAIRE