Aerobic methanotrophy within the pelagic redox-zone of the Gotland Deep (central Baltic Sea)

2012 | journal article. A publication with affiliation to the University of Göttingen.

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​Aerobic methanotrophy within the pelagic redox-zone of the Gotland Deep (central Baltic Sea)​
Schmale, O.; Blumenberg, M.; Kiesslich, K.; Jakobs, G.; Berndmeyer, C. ; Labrenz, M. & Thiel, V.  et al.​ (2012) 
BIOGEOSCIENCES9(12) pp. 4969​-4977​.​ DOI: https://doi.org/10.5194/bg-9-4969-2012 

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Authors
Schmale, Oliver; Blumenberg, Martin; Kiesslich, K.; Jakobs, G.; Berndmeyer, Christine ; Labrenz, M.; Thiel, V. ; Rehder, Gregor
Abstract
Water column samples taken in summer 2008 from the stratified Gotland Deep (central Baltic Sea) showed a strong gradient in dissolved methane concentrations from high values in the saline deep water (max. 504 nM) to low concentrations in the less dense, brackish surface water (about 4 nM). The steep methane-gradient (between 115 and 135m water depth) within the redox-zone, which separates the anoxic deep part from the oxygenated surface water (oxygen concentration 0-0.8 mL L-1), implies a methane consumption rate of 0.28 nM d(-1). The process of microbial methane oxidation within this zone was evident by a shift of the stable carbon isotope ratio of methane between the bottom water (delta C-13 CH4 = -82.4 parts per thousand) and the redoxzone (delta C-13 CH4 = -38.7 parts per thousand). Water column samples between 80 and 119 m were studied to identify the microorganisms responsible for the methane turnover in that depth interval. Notably, methane monooxygenase gene expression analyses for water depths covering the whole redox-zone demonstrated that accordant methanotrophic activity was probably due to only one phylotype of the aerobic type I methanotrophic bacteria. An imprint of these organisms on the particular organic matter was revealed by distinctive lipid biomarkers showing bacteriohopanepolyols and lipid fatty acids characteristic for aerobic type I methanotrophs (e. g., 35-aminobacteriohopane-30,31,32,33,34-pentol), corroborating their role in aerobic methane oxidation in the redox-zone of the central Baltic Sea.
Issue Date
2012
Status
published
Publisher
Copernicus Gesellschaft Mbh
Journal
BIOGEOSCIENCES 
Organization
Fakultät für Geowissenschaften und Geographie
ISSN
1726-4170

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