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Do environmental conditions determine bacterial community composition and functioning? A test of the ubiquity of aquatic bacteria
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution.
In: Article in journal (Refereed) Submitted
URN: urn:nbn:se:uu:diva-92676OAI: oai:DiVA.org:uu-92676DiVA: diva2:165842
Available from: 2005-03-11 Created: 2005-03-11 Last updated: 2016-03-05
In thesis
1. Links Between Structure and Function of Heterotrophic Aquatic Bacterial Communities
Open this publication in new window or tab >>Links Between Structure and Function of Heterotrophic Aquatic Bacterial Communities
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. 64 p.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 18
Ecology, heterotrophic bacteria, dissolved organic matter, diversity, community composition, ecosystem functioning, salinity, Ekologi
National Category
urn:nbn:se:uu:diva-4809 (URN)91-554-6161-1 (ISBN)
Public defence
2005-04-01, Ekmansalen, EBC, Norbyv. 14, Uppsala, 13:00
Available from: 2005-03-11 Created: 2005-03-11Bibliographically approved

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Langenheder, SilkeTranvik, Lars J.
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