uu.seUppsala University Publications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Weak coupling between community composition and functioning of aquatic bacteria
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution.ORCID iD: 0000-0003-3509-8266
2005 (English)In: Limnology and Oceanography, ISSN 0024-3590, Vol. 50, no 3, 957-967 p.Article 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.

Place, publisher, year, edition, pages
2005. Vol. 50, no 3, 957-967 p.
National Category
Ecology
Identifiers
URN: urn:nbn:se:uu:diva-92675DOI: 10.4319/lo.2005.50.3.0957OAI: oai:DiVA.org:uu-92675DiVA: diva2:165841
Available from: 2005-03-11 Created: 2005-03-11 Last updated: 2017-11-30Bibliographically approved
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.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 18
Keyword
Ecology, heterotrophic bacteria, dissolved organic matter, diversity, community composition, ecosystem functioning, salinity, Ekologi
National Category
Ecology
Identifiers
urn:nbn:se:uu:diva-4809 (URN)91-554-6161-1 (ISBN)
Public defence
2005-04-01, Ekmansalen, EBC, Norbyv. 14, Uppsala, 13:00
Opponent
Supervisors
Available from: 2005-03-11 Created: 2005-03-11Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Authority records BETA

Langenheder, SilkeLindström, Eva S.Tranvik, Lars J.

Search in DiVA

By author/editor
Langenheder, SilkeLindström, Eva S.Tranvik, Lars J.
By organisation
Department of Ecology and Evolution
In the same journal
Limnology and Oceanography
Ecology

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 480 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf