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Applied and Environmental Microbiology, September 1999, p. 3834-3842, Vol. 65, No. 9
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Spatial Heterogeneity of Bacterial Populations
along an Environmental Gradient at a Shallow Submarine
Hydrothermal Vent near Milos Island (Greece)
Stefan M.
Sievert,1
Thorsten
Brinkhoff,2,
Gerard
Muyzer,2,
Wiebke
Ziebis,3 and
Jan
Kuever1,*
Department of
Microbiology,1 Molecular Ecology
Group,2 and Department of
Biogeochemistry,3 Max-Planck-Institute for
Marine Microbiology, D-28359 Bremen, Germany
Received 19 April 1999/Accepted 16 June 1999
The spatial heterogeneity of bacterial populations at a
shallow-water hydrothermal vent in the Aegean Sea close to the island of Milos (Greece) was examined at two different times by using acridine
orange staining for total cell counts, cultivation-based techniques,
and denaturing gradient gel electrophoresis (DGGE) analysis of
PCR-amplified 16S rRNA gene fragments. Concurrent with measurements of
geochemical parameters, samples were taken along a transect from the
center of the vent to the surrounding area. Most-probable-number (MPN)
counts of metabolically defined subpopulations generally constituted a
minor fraction of the total cell counts; both counting procedures
revealed the highest cell numbers in a transition zone from the
strongly hydrothermally influenced sediments to normal sedimentary
conditions. Total cell counts ranged from 3.2 × 105
cells ml
1 in the water overlying the sediments to
6.4 × 108 cells g (wet weight) of
sediment
1. MPN counts of chemolithoautotrophic
sulfur-oxidizing bacteria varied between undetectable and 1.4 × 106 cells g
1. MPN counts for sulfate-reducing
bacteria and dissimilatory iron-reducing bacteria ranged from 8 to
1.4 × 105 cells g
1 and from
undetectable to 1.4 × 106 cells g
1,
respectively. DGGE revealed a trend from a diverse range of bacterial
populations which were present in approximately equal abundance in the
transition zone to a community dominated by few populations close to
the center of the vent. Temperature was found to be an important
parameter in determining this trend. However, at one sampling time this
trend was not discernible, possibly due to storm-induced disturbance of
the upper sediment layers.
*
Corresponding author. Mailing address:
Max-Planck-Institute for Marine Microbiology, Celsiusstrasse 1, D-28359
Bremen, Germany. Phone: 49-421-2028734. Fax: 49-421-2028690. E-mail: jkuever{at}mpi-bremen.de.

Present address: Institute for Chemistry and Biology of the Marine
Environment, Carl von Ossietzky Universität, P.O. Box
2503, D-26111 Oldenburg,
Germany.

Present address: Netherlands Institute for Sea Research, NL-1790
AB Den Burg, The
Netherlands.
Applied and Environmental Microbiology, September 1999, p. 3834-3842, Vol. 65, No. 9
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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