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Community structure and activity of sulfate-reducing bacteria in an intertidal surface sediment: a multi-method approach

2002; Inter-Research Science Center; Volume: 29; Linguagem: Inglês

10.3354/ame029211

1616-1564

Enrique Llobet-Brossa, Ralf Rabus, Michael E. Böttcher, Martin Könneke, Niko Finke, Andreas Schramm, Rikke Louise Meyer, Stefan Grötzschel, Ramon Rosselló‐Mora, Rudolf Amann,

Groundwater and Isotope Geochemistry

AME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsSpecials AME 29:211-226 (2002) - doi:10.3354/ame029211 Community structure and activity of sulfate-reducing bacteria in an intertidal surface sediment: a multi-method approach Enrique Llobet-Brossa, Ralf Rabus*, Michael E. Böttcher, Martin Könneke, Niko Finke, Andreas Schramm**, Rikke L. Meyer***, Stefan Grötzschel, Ramon Rosselló-Mora****, Rudolf Amann Max Planck Institute for Marine Microbiology, Celsiusstr. 1, 28359 Bremen, Germany *Corresponding author. E-mail: rrabus@mpi-bremen.de Present addresses: **Lehrstuhl für ökologische Mikrobiologie, BITÖK, Universität Bayreuth, Dr. Hans-Frisch-Str. 1-3, 95440 Bayreuth, Germany ***Aarhus University, Institute for Biological Sciences, Dept. for Microbial Ecology, Ny Munkegade, Bygn 540, 8000 Aarhus C, Denmark ****Area de Microbiologia, Departament de Recursos Naturals, IMEDEA (CSIC-UIB), Crtra. Valldemossa Km 7.5, 07071 Palma de Mallorca, Spain ABSTRACT: The community structure of sulfate-reducing bacteria (SRB) in an intertidal mud flat of the German Wadden Sea (Site Dangast, Jade Bay) was studied and related to sedimentary biogeochemical gradients and processes. Below the penetration depths of oxygen (~3 mm) and nitrate (~4 mm), the presence of dissolved iron and manganese and the absence of dissolved sulfide indicated suboxic conditions within the top 10 cm of the sediment. Moderate to high bacterial sulfate reduction rates were measured with radiotracers throughout the sediment, and dissimilatory sulfate reduction was also demonstrated by the presence of acid-volatile sulfides (AVS, essentially iron monosulfide). Stable sulfur isotope discrimination between dissolved sulfate and AVS was dominated by sulfate reduction. The diversity of SRB was studied using denaturant gradient gel electrophoresis of 16S rDNA, phospholipid fatty acid analysis and counting viable cells with the most probable number technique. Phylogenetic groups of SRB identified with these techniques were almost evenly distributed throughout the top 20 cm of the sediment. Application of fluorescence in situ hybridization, however, demonstrated a maximum of active members of the Desulfovibrio and Desulfosarcina-Desulfococcus-Desulfofrigus groups between 2 and 3 cm depth. These 2 groups encompass acetate and lactate utilizing SRB. The coincidence of this SRB maximum with a local maximum of sulfate reduction rates and the depletion of acetate and lactate reflects the microbiological processes related to sulfate reduction. KEY WORDS: Sulfate-reducing bacteria · Microbial diversity · Intertidal sediments · Sulfate reduction rates · Stable sulfur isotopes · Phospholipid fatty acids · Most probable number · Fluorescence in situ hybridization Full text in pdf format NextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in AME Vol. 29, No. 3. Online publication date: October 23, 2002 Print ISSN: 0948-3055; Online ISSN: 1616-1564 Copyright © 2002 Inter-Research.