Co-Authors:
Minz, D., Department of Civil Engineering, Northwestern University, Evanston, IL 60208-3109, United States, Soil Microbiology, Volcani Research Center, Bet-Dagan, Israel
Fishbain, S., Department of Civil Engineering, Northwestern University, Evanston, IL 60208-3109, United States
Green, S.J., Department of Civil Engineering, Northwestern University, Evanston, IL 60208-3109, United States
Muyzer, G., Max-Planck-Inst. for Mar. Microbiol., D-28359 Bremen, Germany, Netherlands Inst. for Sea Research, Den Burg, Netherlands
Cohen, Y., Moshe Shilo Ctr. Mar. B., Alexander Silberman Inst. Life Sci., Hebrew University of Jerusalem, Jerusalem, Israel
Rittmann, B.E., Department of Civil Engineering, Northwestern University, Evanston, IL 60208-3109, United States
Stahl, D.A., Department of Civil Engineering, Northwestern University, Evanston, IL 60208-3109, United States
Abstract:
The distribution and abundance of sulfate-reducing bacteria (SRB) and eukaryotes within the upper 4 mm of a hypersaline cyanobacterial mat community were characterized at high resolution with group-specific hybridization probes to quantify 16S rRNA extracted from 100-μm depth intervals. This revealed a preferential localization of SRB within the region defined by the oxygen chemocline. Among the different groups of SRB quantified, including members of the provisional families 'Desulfovibrionaceae' and 'Desulfobacteriaceae,' Desulfonema-like populations dominated and accounted for up to 30% of total rRNA extracted from certain depth intervals of the chemocline. These data suggest that recognized genera of SRB are not necessarily restricted by high levels of oxygen in this mat community and the possibility of significant sulfur cycling within the chemocline. In marked contrast, eukaryotic populations in this community demonstrated a preference for regions of anoxia.
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