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Links Between Structure and Function of Heterotrophic Aquatic Bacterial Communities
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Biology, Department of Ecology and Evolution.
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Heterotrophic bacteria utilize dissolved organic matter, and the carbon flow through an ecosystem depends on the fractions of the utilized carbon that is either respired or transferred to higher trophic levels. The major aim this thesis is to investigate 1) the relationship between composition and functioning in heterotrophic bacterioplankton communities and 2) the influence of environmental conditions on both parameters. I set up several batch culture experiments, where lake water filtrates containing bacteria but no grazers were inoculated into sterile freshwater medium to investigate the importance of the origin of the source community (the inoculum) versus the environmental conditions (the medium) for the composition and functional performance of bacterial communities. In some experiments the medium was manipulated to simulate changes in salinity, pH and dissolved organic matter quantity and quality. Functional parameters (biomass yield, respiration, growth efficiency and enzyme activities) and the genetic composition of the emerging bacterial communities were determined.

When bacterial inocula obtained from different habitats were re-grown under identical conditions, differently composed communities emerged. This indicates that the history and distribution of taxa within the inoculum was an important regulating factor of community composition. The coupling between community composition and functioning was not very tight, and there was functional equivalency with respect to aggregated functions important at the ecosystem scale (e.g., biomass production and respiration). The functional performance of bacterial communities could to a large extent be predicted from the medium alone, except when it deviated strongly from the ambient settings. When bacterial communities were exposed to dilution, a strong change in pH or an increase in salinity, growth of structurally and functionally distinct communities occurred. I therefore suggest that it depends on the disturbance regime how bacterial community structure and function are related to each other.

Place, publisher, year, edition, pages
Uppsala: Institutionen för ekologi och evolution , 2005. , p. 64
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 18
Keywords [en]
Ecology, heterotrophic bacteria, dissolved organic matter, diversity, community composition, ecosystem functioning, salinity
Keywords [sv]
Ekologi
National Category
Ecology
Identifiers
URN: urn:nbn:se:uu:diva-4809ISBN: 91-554-6161-1 (print)OAI: oai:DiVA.org:uu-4809DiVA, id: diva2:165846
Public defence
2005-04-01, Ekmansalen, EBC, Norbyv. 14, Uppsala, 13:00
Opponent
Supervisors
Available from: 2005-03-11 Created: 2005-03-11Bibliographically approved
List of papers
1. Weak coupling between community composition and functioning of aquatic bacteria
Open this publication in new window or tab >>Weak coupling between community composition and functioning of aquatic bacteria
2005 (English)In: Limnology and Oceanography, ISSN 0024-3590, E-ISSN 1939-5590, Vol. 50, no 3, p. 957-967Article in journal (Refereed) Published
Abstract [en]

We performed a batch culture experiment with a factorial design in which sterile water from four lakes and bacterial assemblages (size-fractionated lake water) from the same lakes were set up in all possible combinations. The functional performance (biomass yield, respiration, growth rates, and growth efficiency) of bacterial communities growing in the cultures depended primarily on the type of the medium and to a much lesser extent on the origin of the bacterial assemblage. Functional changes were only partly paralleled by changes in community composition, as indicated by terminal restriction fragment length polymorphism analysis. Similar bacterial communities developed in different cultures as a result of receiving either the same medium or the same inoculum, indicating that bacterial communities are comprised of populations of generalists that can grow under most conditions as well as populations with the life strategy of specialists. However, bacteria originating from a slightly acidic polyhumic lake failed to grow, grew unsteadily, or exhibited an extended lag phase when exposed to media originating from other lakes, indicating that the bacterial community in the polyhumic lake was not able to adapt rapidly to changes in environmental conditions.

National Category
Ecology
Identifiers
urn:nbn:se:uu:diva-92675 (URN)10.4319/lo.2005.50.3.0957 (DOI)
Available from: 2005-03-11 Created: 2005-03-11 Last updated: 2017-12-14Bibliographically approved
2. Do environmental conditions determine bacterial community composition and functioning? A test of the ubiquity of aquatic bacteria
Open this publication in new window or tab >>Do environmental conditions determine bacterial community composition and functioning? A test of the ubiquity of aquatic bacteria
In: Article in journal (Refereed) Submitted
Identifiers
urn:nbn:se:uu:diva-92676 (URN)
Available from: 2005-03-11 Created: 2005-03-11 Last updated: 2017-11-30
3. Heterotrophic bacterial growth efficiency and community structure at different natural organic carbon concentrations
Open this publication in new window or tab >>Heterotrophic bacterial growth efficiency and community structure at different natural organic carbon concentrations
2003 In: Applied and Environmental Microbiology, Vol. 69, p. 3701-3709Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-92677 (URN)
Available from: 2005-03-11 Created: 2005-03-11 Last updated: 2017-11-30
4. Salinity as a structuring factor for the composition and performance of bacterioplankton degrading riverine DOC
Open this publication in new window or tab >>Salinity as a structuring factor for the composition and performance of bacterioplankton degrading riverine DOC
2003 (English)In: FEMS Microbiology Ecology, Vol. 45, p. 189-202Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-92678 (URN)
Available from: 2005-03-11 Created: 2005-03-11 Last updated: 2017-11-30
5. Growth dynamics within bacterial communities in riverine and estuarine batch cultures
Open this publication in new window or tab >>Growth dynamics within bacterial communities in riverine and estuarine batch cultures
Show others...
2004 (English)In: Aquatic Microbial Ecology, Vol. 37, p. 137-148Article in journal (Refereed) Published
National Category
Natural Sciences
Identifiers
urn:nbn:se:uu:diva-92679 (URN)
Available from: 2005-03-11 Created: 2005-03-11 Last updated: 2017-11-30

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