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          Institute: MPI für marine Mikrobiologie     Collection: Abteilung Biogeochemie     Display Documents

ID: 13917.0, MPI für marine Mikrobiologie / Abteilung Biogeochemie
Metabolic shifts in hypersaline microbial mats upon addition of organic substrates
Authors:Grötzschel, S.; Abed, R. M. M.; de Beer, D.
Date of Publication (YYYY-MM-DD):2002-11
Title of Journal:Environmental Microbiology
Journal Abbrev.:Environ. Microbiol.
Issue / Number:11
Start Page:683
End Page:695
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:The responses of hypersaline microbial mats to the addition of acetate, glycolate or glucose were investigated using oxygen, pH and sulphide microsensors. Changes in community structure were investigated with molecular techniques. Acetate addition inhibited respiration in the photic zone, stimulated respiration in the aphotic zone and had no effect on gross photosynthesis. Glycolate addition strongly increased both respiration and gross photosynthesis in the photic zone. Thus, glycolate and acetate were probably consumed in those regions of the mat where these substrates are usually formed. Moreover, photosynthesis was only stimulated by increased respiration and concomitant CO2 production in the photic zone which indicates that the photosynthetic and respiratory populations must be present in close proximity to each other. Glucose addition had an unexpected negative effect on the microbial population, strongly inhibiting both respiration and gross photosynthesis within hours. After four days, oxygen profiles in the light were equal to those measured in the dark. After replacing the water phase with unamended water, photosynthesis and respiration recovered within a week. None of the physiological changes were accompanied by detectable shifts in the cyanobacterial or the overall microbial community. The mechanism of inhibition of photosynthesis by glucose requires further investigation.
Comment of the Author/Creator:Date: 2002, NOV
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für marine Mikrobiologie
External Affiliations:Max Planck Inst Marine Microbiol, Celsiusstr 1, D-28359 Bremen,; Germany; Max Planck Inst Marine Microbiol, D-28359 Bremen, Germany
Identifiers:ISI:000179540100008 [ID No:1]
ISSN:1462-2912 [ID No:2]
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