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Applied and Environmental Microbiology, August 1999, p. 3721-3726, Vol. 65, No. 8
Max-Planck-Institut für Marine
Mikrobiologie, Bremen, Germany
Received 11 March 1999/Accepted 25 April 1999
Fluorescence in situ hybridization (FISH) with rRNA-targeted
oligonucleotide probes was used to investigate the phylogenetic composition of bacterioplankton communities in several freshwater and
marine samples. An average of about 50% of the cells were detected by
probes for the domains Bacteria and Archaea,
and of these, about half could be identified at the subdomain level
with a set of group-specific probes. Beta subclass proteobacteria
constituted a dominant fraction in freshwater systems, accounting for
16% (range, 3 to 32%) of the cells, although they were essentially absent in the marine samples examined. Members of the
Cytophaga-Flavobacterium cluster were the most abundant
group detected in the marine systems, accounting for 18% (range, 2 to
72%) of the 4',6-diamidino-2-phenylindole (DAPI) counts, and they were
also important in freshwater systems (7%, range 0 to 18%).
Furthermore, members of the alpha and gamma subclasses of
Proteobacteria as well as members of the
Planctomycetales were detected in both freshwater and
marine water in abundances <7%.
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Bacterioplankton Compositions of Lakes and Oceans:
a First Comparison Based on Fluorescence In Situ
Hybridization
*
Corresponding author. Mailing address:
Max-Planck-Institut für Marine Mikrobiologie, Celsiusstr. 1, D-28359 Bremen, Germany. Phone: 49 421 2028-930. Fax: 49 421 2028-790. E-mail: ramann{at}mpi-bremen.de.
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