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Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/1022

Authors: Rusch, A.*
Walpersdorf, E.*
deBeer, D.*
Gurrieri, S.*
Amend, J. P.*
Title: Microbial communities near the oxic/anoxic interface in the hydrothermal system of Vulcano Island, Italy
Title of journal: Chemical geology
Series/Report no.: 224(2005)
Publisher: Elsevier
Issue Date: 2005
DOI: 10.1016/j.chemgeo.2005.07.026
URL: http://www.sciencedirect.com/
Keywords: Biogeochemistry
Hydrothermal system
Marine sediment
Microbial ecology
Microsensor
Thermophiles
Abstract: Hydrothermal fluids and sediments from subaerial and shallow submarine sites at Vulcano Island, Italy were investigated for relations between the thermophilic microbial communities, as analysed by fluorescence in situ hybridization, and their geochemical environment, as assessed by photometry, chromatography, and in situ microsensor measurements. Mixing between hydrothermal fluids and seawater in the sediment pore space was reflected in the chemical composition of the emitted fluids, in depth profiles of pore water oxygen and sulfide concentrations, and in the structure of the benthic microbial community. Organic compounds did not accumulate in the vent fluids (b10 AM fatty acids) or in the sediments (b0.1% Corg), suggesting that efficient utilization supported microbial populations on the order of 104 cells per ml fluid and 108 cells per cm3 sediment. Groups of thermophiles that typically gain metabolic energy from the fermentation of organic matter (Thermococcales, Thermotoga/Thermosipho spp., and Bacillus sp.)were detected in significant abundances at all study sites. Also abundant were thermophiles capable of oxidizing organic acids with oxygen, nitrate, or sulfate. Aerobic thermophiles (Aquificales and Thermus sp.) were more abundant at oxic sites than at anoxic sites. Increasingly oxygenated habitats were associated with decreasing abundance of anaerobic (hyper)thermophiles belonging to the order Archaeoglobales.
Appears in Collections:03.04.04. Ecosystems
03.04.06. Hydrothermal systems
Papers Published / Papers in press

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