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Aquatic Microbial Ecology

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AME 30:11-18 (2002)  -  doi:10.3354/ame030011

Antibiotic resistance of heterotrophic bacteria in Shira lake: natural and anthropogenic impacts

T. I. Lobova*, Yu. V. Barkhatov, L. Yu. Popova

Centre Institute of Biophysics, Russian Academy of Sciences, Siberian Branch, Academgorodok 50, Krasnoyarsk 660036, Russia

ABSTRACT: Studies were conducted to investigate the antibiotic resistance of freshwater, halophile and moderate halotolerant bacteria isolated from the nearshore part of Shira lake, which is affected by the activity of a health resort, and from the central part of the lake in the summer (June to August) of 1999. It has been shown that the allochthonous microflora, which is brought into the lake with the resort effluent in mid-summer, is the anthropogenic factor contributing to an increase in the number of freshwater bacteria that feature multiple antibiotic resistance in the central part of the lake. It has been found that resistance to ampicillin of freshwater and halophile heterotrophic bacteria is related to the increase in the biomass of blue-green and green algae in the central part of Shira lake between mid-July and the end of August. A mathematical model has been constructed to describe the dynamics of the antibiotic resistance of heterotrophic bacteria in the close-to-resort and the central parts of Shira lake under natural and anthropogenic impacts.

KEY WORDS: Heterotrophic bacteria · Halotolerance · Antibiotic resistance · Anthropogenic load · Brackish lake · Mathematical modeling

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