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Applied and Environmental Microbiology, February 1999, p. 795-801, Vol. 65, No. 2
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Changes in Bacterial and Eukaryotic Community
Structure after Mass Lysis of Filamentous Cyanobacteria
Associated with Viruses
Erik J.
van
Hannen,*
Gabriel
Zwart,
Miranda P.
van Agterveld,
Herman J.
Gons,
Jeannine
Ebert, and
Hendrikus J.
Laanbroek
Department of Microbial Ecology, Centre for
Limnology, Netherlands Institute of Ecology, 3600 BG Maarssen, The
Netherlands
Received 5 October 1998/Accepted 19 November 1998
During an experiment in two laboratory-scale enclosures filled with
lake water (130 liters each) we noticed the almost-complete lysis of
the cyanobacterial population. Based on electron microscopic observations of viral particles inside cyanobacterial filaments and
counts of virus-like particles, we concluded that a viral lysis of the
filamentous cyanobacteria had taken place. Denaturing gradient gel
electrophoresis (DGGE) of 16S ribosomal DNA fragments qualitatively
monitored the removal of the cyanobacterial species from the community
and the appearance of newly emerging bacterial species. The majority of
these bacteria were related to the Cytophagales and
actinomycetes, bacterial divisions known to contain species capable of
degrading complex organic molecules. A few days after the cyanobacteria
started to lyse, a rotifer species became dominant in the DGGE profile
of the eukaryotic community. Since rotifers play an important role in
the carbon transfer between the microbial loop and higher trophic
levels, these observations confirm the role of viruses in channeling
carbon through food webs. Multidimensional scaling analysis of the DGGE
profiles showed large changes in the structures of both the bacterial
and eukaryotic communities at the time of lysis. These changes were
remarkably similar in the two enclosures, indicating that such
community structure changes are not random but occur according to a
fixed pattern. Our findings strongly support the idea that viruses can
structure microbial communities.
*
Corresponding author. Mailing address: Dept. of
Microbial Ecology, Netherlands Institute of Ecology, Centre for
Limnology, P.O. Box 1299, 3600 BG Maarssen, The Netherlands. Phone: 31 (0)294 239315. Fax: 31 (0)294 232224. E-mail:
vanhannen{at}cl.nioo.knaw.nl.

Publication no. 2483 of the Netherlands Institute of Ecology,
Centre for
Limnology.
Applied and Environmental Microbiology, February 1999, p. 795-801, Vol. 65, No. 2
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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