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Reduced diversity and changed bacterioplankton community composition do not affect utilization of dissolved organic matter in the Adriatic Sea

  • Johanna Sjöstedt
  • Mikael Pontarp
  • Tinkara Tinta
  • Hanna Alfredsson
  • Valentina Turk
  • Per Lundberg
  • Ake Hagstrom
  • Lasse Riemann
Publishing year: 2013
Language: English
Pages: 15-132
Publication/Series: Aquatic Microbial Ecology
Volume: 71
Issue: 1
Document type: Journal article
Publisher: Inter-Research

Abstract english

To obtain insights into the coupling between community composition, diversity and community function, bacterioplankton assemblages from the Gulf of Trieste (Northern Adriatic Sea) were exposed to increasing environmental stress throughout 2 wk in continuous seawater cultures to construct communities differing in composition and diversity. The assemblages were exposed to (1) decreased temperature, (2) decreased temperature and phosphate addition or (3) decreased temperature, phosphate addition and lowered oxygen level. Bacterial and viral abundances as well as bacterial community composition stabilized during the second week of the experiment. Denaturing gradient gel electrophoresis and pyrosequencing of 16S rRNA genes showed dramatic reductions in bacterial diversity in all treatments and major compositional differences relative to the inoculum. Nevertheless, no differences in the ability to exploit dissolved organic carbon (DOC) were found for the acquired communities relative to the inoculum, indicating that the bacterial communities were functionally redundant. We speculate that oscillations in exploitation of the DOC pool in situ are mainly governed by factors limiting the overall bacterial growth, rather than perturbations affecting only subsets of the microbial biota.


  • Biological Sciences
  • Diversity
  • Functional redundancy
  • Community structure
  • Continuous
  • cultures
  • DOC


  • ISSN: 0948-3055
Portrait of Johanna Sjöstedt
E-mail: johanna [dot] sjostedt [at] biol [dot] lu [dot] se

Postdoctoral fellow

Division aquatic ecology

+46 46 222 84 38

+46 73 913 31 19




Aquatic Ecology


Research group

Aquatic Ecology



Postdoc host

  • Emma Kritzberg
  • Eva Lindström, Uppsala University
  • Silke Langenheder, Uppsala University

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Raw data for the artikel Effect of repeated disturbances on resistance and resilience in aquatic bacterioplankton communities (Zip; 2 MB)