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Title Sulfate-reducing bacteria and their activities in cyanobacterial mats of Solar Lake (Sinai, Egypt)
Creator/Author Teske, A. ; Ramsing, N.B. ; Habicht, K. ; Kuever, J. ; Joergensen, B.B. [Max Planck Inst. for Marine Microbiology, Bremen (Germany)] ; Fukui, Manabu [National Inst. for Resources and Environment, Tsukuba, Ibaraki (Japan)] ; Cohen, Y. [Hebrew Univ. of Jerusalem (Israel)]
Publication Date1998 Aug 01
OSTI IdentifierOSTI ID: 642342
Other Number(s)AEMIDF; ISSN 0099-2240
Resource TypeJournal Article
Resource RelationApplied and Environmental Microbiology ; VOL. 64 ; ISSUE: 8 ; PBD: Aug 1998
Subject54 ENVIRONMENTAL SCIENCES ; EGYPTIAN ARAB REPUBLIC; LAKES; SEDIMENTS; SULFATE-REDUCING BACTERIA; CYANOBACTERIA; WATER POLLUTION; SULFATES
Description/Abstract The sulfate-reducing bacteria within the surface layer of the hypersaline cyanobacterial mat of Solar Lake (Sinai, Egypt) were investigated with combined microbiological, molecular, and biogeochemical approaches. The diurnally oxic surface layer contained between 10{sup 6} and 10{sup 7} cultivable sulfate-reducing bacteria ml{sup{minus}1} day{sup{minus}1}, both in the same range as and sometimes higher than those in anaerobic deeper mat layers. In the oxic surface layer and in the mat layers below, filamentous sulfate-reducing Desulfonema bacteria were found in variable densities of 10{sup 4} and 10{sup 6} cells ml{sup{minus}1}. A Desulfonema-related, diurnally migrating bacterium was detected with PCR and denaturing gradient gel electrophoresis within and below the oxic surface layer. Facultative aerobic respiration, filamentous morphology, motility, diurnal migration, and aggregate formation were the most conspicuous adaptations of Solar Lake sulfate-reducing bacteria to the mat matrix and to diurnal oxygen stress. A comparison of sulfate reduction rates within the mat and previously published photosynthesis rates showed that CO{sub 2} from sulfate reduction in the upper 5 mm accounted for 7 to 8% of the total photosynthetic CO{sub 2} demand of the mat.
Country of PublicationUnited States
LanguageEnglish
Formatpp. 2943-2951 ; PL:
System Entry Date2001 May 06

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