Abstract
The differences in the bacterio- and zooplankton communities of small- and medium-sized watercourses classified on the specifics of natural processes and consequences of anthropogenic activity in the territory of Voronezh oblast are described. Soil erosion, along with contamination of surface waters by industrial and municipal sewage and pesticides, has the greatest impact. The water current velocity, contamination by organic matter and nutrients, and the extent of macrophyte overgrowth affect the quantitative and qualitative composition of plankton in local parts of the studied watercourses.
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