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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
Monika Anna Fabiś Monika Anna Fabiś,, Wydział Biologii [nowa struktura organizacyjna] (SNP/WB)Szkoła Nauk Przyrodniczych [nowa struktura organizacyjna] (SNP)
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)
6.4 biological sciences
Status
Finished
Defense Date
07-12-2010
Title date
07-12-2010
Supervisor
Marek Kraska Marek Kraska,, Wydział Biologii [nowa struktura organizacyjna] (SNP/WB)Szkoła Nauk Przyrodniczych [nowa struktura organizacyjna] (SNP)
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

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