[Bacterioplankton and bacteriobenthos of some floodplain lakes in the course of the lower Amur river].
The main structural and functional characteristics of bacterioplankton and bacteriobenthos of three lakes in the lower course of the Amur River are presented: the total number of bacteria (TNB), biomass, the numbers of bacteria of certain aerobic and anaerobic groups; the intensities of methanogenesis (MG), methane oxidation (MO), assimilation of 14C-compounds, sulfate reduction (SR); and gross estimate of organic matter decomposition (D). Depending on the reservoir type and the anthropogenic load, TNB constituted (2.27 to 16.1) x 10(6) cells/ml in water and (1.06 to 10.35) x 10(9) cells/ml in sediments; MO was 0 to 0.28 ml CH4/(1 day) in water and 0 to 8.4 ml CH4/(dm3 day) in sediments; MG in sediments was 0.001 to 40 ml CH4/(dm3 day); SR varied from 0.001 to 24.8 mg S/(dm3 day); D was 0.3 to 25 g C/(m2 day) in water and 0.2 to 4.9 g C/(m2 day) in sediments. The role of anaerobic microbial processes of organic matter decomposition was shown to increase with an increase in the anthropogenic load, attaining 95% of the total D in the ecosystem of an accumulating pond.
Dziuban
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Papanin Institute of Inland Water Biology, Russian Academy of Sciences, Borok, Nekouzskii raion, Yuaroslavl Oblast, 152742 Russia. microb@ibiw.yuaroslavl.ru
D000818:Animals; D001420:Bacteria, Aerobic / Q000302:isolation & purification*; D001421:Bacteria, Anaerobic / Q000302:isolation & purification*; D005618:Fresh Water; D010933:Plankton / Q000302:isolation & purification*; D014871:Water Microbiology