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Applied and Environmental Microbiology, November 2003, p. 6610-6619, Vol. 69, No. 11
0099-2240/03/$08.00+0 DOI: 10.1128/AEM.69.11.6610-6619.2003
Copyright © 2003, American
Society for
Microbiology. All Rights Reserved.
Diversity and Structure of Bacterial Communities in Arctic versus Antarctic Pack Ice
Robin Brinkmeyer,1 Katrin Knittel,2 Jutta Jürgens,1 Horst Weyland,1 Rudolf Amann,2 and Elisabeth Helmke1*
Alfred
Wegener Institute for Polar and Marine Research,
Bremerhaven,1
Max Planck
Institute for Marine Microbiology, Bremen,Germany2
Received 27 January 2003/
Accepted 4 August 2003
A
comprehensive assessment of bacterial diversity and community
composition in arctic and antarctic pack ice was conducted through
cultivation and cultivation-independent molecular techniques. We
sequenced 16S rRNA genes from 115 and 87 pure cultures of bacteria
isolated from arctic and antarctic pack ice, respectively. Most of the
33 arctic phylotypes were >97% identical to previously
described antarctic species or to our own antarctic isolates. At both
poles, the
- and
-proteobacteria and the
Cytophaga-Flavobacterium group were the dominant
taxonomic bacterial groups identified by cultivation as well as by
molecular methods. The analysis of 16S rRNA gene clone libraries from
multiple arctic and antarctic pack ice samples revealed a high
incidence of closely overlapping 16S rRNA gene clone and isolate
sequences. Simultaneous analysis of environmental samples with
fluorescence in situ hybridization (FISH) showed that
95% of 4',6'-diamidino-2-phenylindole
(DAPI)-stained cells hybridized with the general bacterial probe
EUB338. More than 90% of those were further assignable.
Approximately 50 and 36% were identified as
-proteobacteria in arctic and antarctic samples,respectively. Approximately 25% were identified as
-proteobacteria, and 25% were identified as belonging
to the Cytophaga-Flavobacterium group. For the
quantification of specific members of the sea ice community, new
oligonucleotide probes were developed which target the genera
Octadecabacter, Glaciecola, Psychrobacter,
Marinobacter, Shewanella, and Polaribacter.
High FISH detection rates of these groups as well as high viable counts
corroborated the overlap of clone and isolate sequences. A terrestrial
influence on the arctic pack ice community was suggested by the
presence of limnic
phylotypes.
* Corresponding
author. Mailing address: Alfred-Wegener-Institut für Polar und
Meeresforschung, Am Handelshafen 12, D-27570 Bremerhaven, Germany.
Phone: 49 471 4831 1460. Fax: 49 471 4831 1425. E-mail:
ehelmke{at}awi-bremerhaven.de.
Applied and Environmental Microbiology, November 2003, p. 6610-6619, Vol. 69, No. 11
0099-2240/03/$08.00+0 DOI: 10.1128/AEM.69.11.6610-6619.2003
Copyright © 2003, American
Society for
Microbiology. All Rights Reserved.
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