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  Rapid Daphnia-mediated changes in microbial community structure: an experimental study

Degans, H., Zöllner, E., Van der Gucht, K., De Meester, L., & Jürgens, K. (2002). Rapid Daphnia-mediated changes in microbial community structure: an experimental study. FEMS Microbiology Ecology, 42(1), 137-149.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-DCE5-9 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-DCE6-7
Genre: Journal Article

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 Creators:
Degans, Hanne, Author
Zöllner, Eckart1, Author              
Van der Gucht, Kathleen, Author
De Meester, Luc1, Author              
Jürgens, Klaus1, Author              
Affiliations:
1Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_976547              

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Free keywords: Daphnia grazing; bacterioplankton; morphotype; DGGE
 Abstract: Shifts in morphological and taxonomical composition of bacterioplankton communities in response to protist and metazoan grazing were studied in bottle experiments, exposing bacterioplankton from a eutrophic clear-water pond, dominated by a large population of Daphnia magna, to a Daphnia gradient, ranging from 0 to 60 individuals per liter. Prior to the first experiment, the bacterioplankton community was shaped by protist grazing, while for the second experiment, bacterioplankton was pre-adapted to Daphnia grazing. In both experiments, rapid shifts in biomass and structure of the bacterioplankton community upon exposure to Daphnia grazing were observed. High Daphnia densities suppressed protozoa, resulting in a dominance of free-living bacteria. Under low Daphnia densities, heterotrophic nanollagellates (HNF) developed as the dominant grazers and complex morphotypes (filaments, aggregates) were abundant in the bacterial community. Denaturing gradient gel electrophoresis analysis showed that taxonomical changes accompanied the morphological differences between bacterial communities shaped by HNF or Daphnia grazing. However, comparing ciliate- and Daphnia- dominated bacterial communities, we observed a discrepancy between morphological and taxonomical shifts, indicating that other traits than mere morphological ones determine vulnerability of bacterioplankton to specific grazers. Our results illustrate the rapid, pronounced and reversible impact of grazing on the morphology and taxon composition of bacterioplankton. Our results also stress that Daphnia may, already at moderate densities, have a pronounced impact on the lake bacterioplankton, both through direct grazing on the bacteria and through grazing on protozoan bacterivores. (C) 2002 Federation of European Microbiological Societies. Published by Elsevier Science B.V. All rights reserved.

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Language(s): eng - English
 Dates: 2002-10
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: eDoc: 3932
ISI: 000178607900014
Other: 2099/S 37811
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Title: FEMS Microbiology Ecology
  Alternative Title : FEMS Microbiol. Ecol.
Source Genre: Journal
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Pages: - Volume / Issue: 42 (1) Sequence Number: - Start / End Page: 137 - 149 Identifier: ISSN: 0168-6496