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Applied and Environmental Microbiology, July 2000, p. 2835-2841, Vol. 66, No. 7
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Influence of Sulfide and Temperature on Species Composition and
Community Structure of Hot Spring Microbial Mats
Sigurlaug
Skirnisdottir,1,2
Gudmundur O.
Hreggvidsson,1
Sigridur
Hjörleifsdottir,1
Viggo T.
Marteinsson,1
Solveig
K.
Petursdottir,1
Olle
Holst,2 and
Jakob
K.
Kristjansson1,3,*
Prokaria Ltd., Keldnaholt, IS-112
Reykjavik,1 and Institute of Biology,
University of Iceland, IS-108 Reykjavik,3
Iceland, and Department of Biotechnology, Center for Chemistry
and Chemical Engineering, Lund University, SE-221 00 Lund,
Sweden2
Received 24 February 2000/Accepted 25 April 2000
In solfataric fields in southwestern Iceland, neutral and
sulfide-rich hot springs are characterized by thick bacterial mats at
60 to 80°C that are white or yellow from precipitated sulfur (sulfur
mats). In low-sulfide hot springs in the same area, grey or pink
streamers are formed at 80 to 90°C, and a Chloroflexus mat is formed at 65 to 70°C. We have studied the microbial diversity of one sulfur mat (high-sulfide) hot spring and one
Chloroflexus mat (low-sulfide) hot spring by cloning and
sequencing of small-subunit rRNA genes obtained by PCR amplification
from mat DNA. Using 98% sequence identity as a cutoff value, a total
of 14 bacterial operational taxonomic units (OTUs) and 5 archaeal OTUs
were detected in the sulfur mat; 18 bacterial OTUs were detected in the
Chloroflexus mat. Although representatives of novel
divisions were found, the majority of the sequences were >95% related
to currently known sequences. The molecular diversity analysis showed
that Chloroflexus was the dominant mat organism in the
low-sulfide spring (1 mg liter
1) below 70°C, whereas
Aquificales were dominant in the high-sulfide spring (12 mg
liter
1) at the same temperature. Comparison of the
present data to published data indicated that there is a relationship
between mat type and composition of Aquificales on the one
hand and temperature and sulfide concentration on the other hand.
*
Corresponding author. Mailing address: IceTherm
Discovery Ltd., Keldnaholt, IS-112 Reykjavik, Iceland. Phone: (354)
5707200. Fax: (354) 5707210. E-mail: jakobk{at}iti.is.
Applied and Environmental Microbiology, July 2000, p. 2835-2841, Vol. 66, No. 7
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
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