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Mechanisms and control of microbiological processes of degradation and utillization of organic mater in lacustrine ecosystems of different degrees of eutrophication

100%
Chrost R. J., Gajewski A. J., Lalke E.
Biotechnologia
|
1994
|
issue 4
82-95
EN
The report presents the results of a study of phytoplankton primary and bacterial secondary production and enzymatic activities in surface lake water sampled from five lakes (Mazurian Lake District, Poland) of different degrees of eutrophication during summer stratification period.The rates of bacterial processes related to the tropic status of the lakes.The magnitude of bacterial production was strongly depended on bacterial enzymatic degradation of polymeric organic matter.Through the production of hydrolitic enzymes bacteria were capable of utilizing a variety of polymeric substrates, otherwise not utilizable, which predominated in lake water.The autors also propose and discuss a model of flow of organic matter in aquatic ecosystems and a role of bacteria and phages in this process.
2

Role of epiphytic bacteria in the utilisation of organic matter

100%
Lalke E., Donderski W., Blotevogel K.-H.
Oceanological Studies
|
1996
|
vol. 25
|
issue 4
19-30
EN
Studies were conducted on the occurrence, secondary production and utilisation of different groups of dissolved free amino acids (DFAA) and carbohydrates (DFCHO) by epi-phytic bacteria inhabiting three different freshwater plants. The maximum total number of epi-phytic bacteria was found in summer on the abaxial surfaces of Nuphar luteum leaves. The minimum density of bacteria was found on mature shoots of Potamogeton lucens in summer and autumn. The highest bacterial production was achieved in autumn on the lower sections of Phragmites australis. DFAA utilisation was more intensive in spring. In general, DFCHO were poorly utilised in all seasons.
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