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Decomposition intensity of organic matter by bacterioplankton in dystrophic lakes of the Drawieński National Park
Monika Anna Fabiś
Abstract
The humic substances (HS) commonly found in the soil and water environment. Owing to specific physical and chemical properties of HS, they have an effect on growth, metabolic processes and multiplication of microorganisms. The aim of this study was to evaluate the development intensity of bacteria isolated from water of the humic lakes in the Drawieński National Park. These lakes differed in the concentration of humic substances. The investigations included: total bacterial number, the number of heterotrophic bacteria, the activities of microbial enzymes, secondary bacterial production, respiration rate, consumption of HS by bacteria (Actinobacteria). The following results were gained in the course of my research: 1. Bacterial assemblages in three lakes were significantly different in the rates of enzymatic actvities, bacterial secondary production and bacterial numbers. 2. Bacterial growth and activity were regulated by organic matter concentration. In oligotrophic, nonhumic lake, DOC concentration and bacterial secondary production were significantly lower than in humic lakes of the DPN. 3. The rate of bacterial secondary production was not significantly different in oligo/meso-and polyhumic lakes. 4. Vmax of chitinase, was positively dependent on the humic content in lakes. 5. The bacteria (Actinobacteria) demonstrated the ability to decompose fulvic acids and humic acids. However, the importance of degradation of humic substances was not significant because of low bacterial numbers (Actinobacteria) in dystrophic lakes.- Record ID
- UAM5c08cd1e4aa34a26a8cdb877e9d1d3a7
- Diploma type
- Doctor of Philosophy
- Author
- Title in Polish
- Intensywność rozkładu materii organicznej przez bakterioplankton w jeziorach dystroficznych Drawieńskiego Parku Narodowego
- Title in English
- Decomposition intensity of organic matter by bacterioplankton in dystrophic lakes of the Drawieński National Park
- Language
- pol (pl) Polish
- Certifying Unit
- Faculty of Biology (SNP/WB/FoB)
- Discipline
- biology / (biological sciences domain) / (biological sciences)
- Scientific discipline (2.0)
- Status
- Finished
- Defense Date
- 07-12-2010
- Title date
- 07-12-2010
- Supervisor
- URL
- http://hdl.handle.net/10593/690 Opening in a new tab
- Keywords in English
- bacterioplankton, humic lakes, bacterial secondary production, extracellular enzymes,respiration
- Abstract in English
- The humic substances (HS) commonly found in the soil and water environment. Owing to specific physical and chemical properties of HS, they have an effect on growth, metabolic processes and multiplication of microorganisms. The aim of this study was to evaluate the development intensity of bacteria isolated from water of the humic lakes in the Drawieński National Park. These lakes differed in the concentration of humic substances. The investigations included: total bacterial number, the number of heterotrophic bacteria, the activities of microbial enzymes, secondary bacterial production, respiration rate, consumption of HS by bacteria (Actinobacteria). The following results were gained in the course of my research: 1. Bacterial assemblages in three lakes were significantly different in the rates of enzymatic actvities, bacterial secondary production and bacterial numbers. 2. Bacterial growth and activity were regulated by organic matter concentration. In oligotrophic, nonhumic lake, DOC concentration and bacterial secondary production were significantly lower than in humic lakes of the DPN. 3. The rate of bacterial secondary production was not significantly different in oligo/meso-and polyhumic lakes. 4. Vmax of chitinase, was positively dependent on the humic content in lakes. 5. The bacteria (Actinobacteria) demonstrated the ability to decompose fulvic acids and humic acids. However, the importance of degradation of humic substances was not significant because of low bacterial numbers (Actinobacteria) in dystrophic lakes.
- Uniform Resource Identifier
- https://researchportal.amu.edu.pl/info/phd/UAM5c08cd1e4aa34a26a8cdb877e9d1d3a7/
- URN
urn:amu-prod:UAM5c08cd1e4aa34a26a8cdb877e9d1d3a7