title: Some factors affecting the heterotrophic activity of bacteria in lake.
abstract: The heterotrophic activity of aquatic bacteria was measured by incorporation of 3H-thymidine, uptake of 14C-sodium acetate and mineralization of 14C-acetate. The temperature of water, oxygen content and concentration of chlorophyll a were also measured in the studied lakes. The obtained results of the studied processes in the surface layer and epilimnion were distinguished by negative correlation coefficients. A distinctive feature is the relation between chlorophyll a concentration in the water bodies and heterotrophic activity of bacteria. This indicates a negative dependence between these processes and phytoplankton activity in the photic zone. In contrast a positive relationship between phytoplankton activity and heterotrophic activity of bacteria was found in the metalimnion and hypolimnion of the studied lakes.
mesh_terms: D000085:Acetates / Q000378:metabolism; D001419:Bacteria / Q000378:metabolism*; D002250:Carbon Radioisotopes; D002734:Chlorophyll / Q000032:analysis; D004463:Ecology; D005618:Fresh Water / Q000032:analysis; D007553:Isotope Labeling; D008900:Mineral Waters / Q000032:analysis; D009751:Nutritional Requirements; D010100:Oxygen / Q000032:analysis; D011044:Poland; D012964:Sodium / Q000032:analysis / Q000378:metabolism; D013696:Temperature; D014316:Tritium; D014871:Water Microbiology
chemical_list: D000085:Acetates; D002250:Carbon Radioisotopes; D008900:Mineral Waters; D014316:Tritium; D002734:Chlorophyll; D012964:Sodium; D010100:Oxygen