[Microbiological characteristics of the lakes in the Yaroslavl region].

The paper presents data concerning the activity of microflora in water and ooze deposits of lakes of the Yaroslavl Region. Microbiological processes in water depend mainly on the rate of production or organic substance at the account of phytoplankton photosynthesis, which varies from 0.18 to 6.3 gC/m2. Destruction of organic substance in water of most lakes exceeded production. Production of bacterial biomass was within limits of 0.2--5.8 gC/m2/day and lower, as a rule, than production of phytoplankton. The number of bacteria in different lakes varied from 1.7 to 35 X 10(6) per 1 ml. Heterotrophic assimilation of carbon dioxide was rather high and reached 34 mcgC/litre/day, its ratio to biomass being ca. 6.8%. The total number of bacteria in ooze deposits of lakes varied from 0.6 to 2.7 X 10(9) g/m2. Aerobic destruction varied from 0.03 to 0.78 gC/m2.