Anaerobic oxidation of methane in hypersaline cold seep sediments
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
 
ID 1469220
Author(s) Maignien, Loïs; Parkes, R John; Cragg, Barry; Niemann, Helge; Knittel, Katrin; Coulon, Stephanie; Akhmetzhanov, Andrey; Boon, Nico
Author(s) at UniBasel Niemann, Helge
Year 2013
Title Anaerobic oxidation of methane in hypersaline cold seep sediments
Journal FEMS microbiology ecology
Volume 83
Number 1
Pages / Article-Number 214-31
Keywords methane cold seep, Mercator mud volcano, sulphate reduction, 16S rDNA gene libraries, Gulf of Cadiz, Captain Arutyunov mud volcano
Abstract Life in hypersaline environments is typically limited by bioenergetic constraints. Microbial activity at the thermodynamic edge, such as the anaerobic oxidation of methane (AOM) coupled to sulphate reduction (SR), is thus unlikely to thrive in these environments. In this study, carbon and sulphur cycling was investigated in the extremely hypersaline cold seep sediments of Mercator mud volcano. AOM activity was partially inhibited but still present at salinity levels of 292 g L-1 (c. eightfold sea water concentration) with rates of 2.3 nmol cm-3 day-1 and was even detectable under saturated conditions. Methane and evaporite-derived sulphate comigrated in the ascending geofluids, which, in combination with a partial activity inhibition, resulted in AOM activity being spread over unusually wide depth intervals. Up to 79% of total cells in the AOM zone were identified by fluorescence in situ hybridization (FISH) as anaerobic methanotrophs of the ANME-1. Most ANME-1 cells formed monospecific chains without any attached partner. At all sites, AOM activity co-occurred with SR activity and sometimes significantly exceeded it. Possible causes of these unexpected results are discussed. This study demonstrates that in spite of a very low energy yield of AOM, microorganisms carrying this reaction can thrive in salinity up to halite saturation.
Publisher Elsevier
ISSN/ISBN 0168-6496
edoc-URL http://edoc.unibas.ch/dok/A6056152
Full Text on edoc No
Digital Object Identifier DOI 10.1111/j.1574-6941.2012.01466.x
PubMed ID http://www.ncbi.nlm.nih.gov/pubmed/22882187
ISI-Number WOS:000312295000019
Document type (ISI) Article
 
   

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