The possibility of using microbiological indicators to assess the state of watercources with high water color (on the example of tributaries of lake Onega)

The article presents the results of studies of hydrochemical and microbiological indicators of the tributaries located on the southwestern, northwestern and northern shores of Lake Onega. The chemical composition of most of the studied watercourses is formed under the influence of a swampy catchment area (high color indices, iron content) and anthropogenic load. It is known that the content of humus substances can reduce the availability of heavy metals for biota, change the permeability of the cell membrane, which ultimately can modify the influence of the anthropogenic factor. Biota, and in particular bacterial plankton, is able to react differently to the presence of humus substances in water, which can affect the assessment of water quality according to generally accepted classifications developed for transparent reservoirs. Using the principal component analysis, the absence of the influence of swampy catchment areas on the river microbiota was shown. The leading role of the anthropogenic factor in the quantitative development of bacterial plankton in the tributaries of Lake Onega and the possibility of using microbiological indicators to assess the state of small rivers with high water color are proved.