Aerobic methanotrophy in the oxic-anoxic transition zone of the Black Sea water column

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Erscheinungsjahr:
2007
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Text
Beschreibung:
  • Large amounts of dissolved methane (> 98%) are effectively oxidised by anaerobic and aerobic microorganisms in the Black Sea water column. In the oxic–anoxic transition zone methane concentrations rapidly decrease and an enrichment in 13CH4 – most likely a result of microbial methane consumption – is observed. Using high performance liquid chromatography–mass spectrometry (HPLC–MS), we show that intact bacteriohopanoids, characteristic for aerobic methanotrophic bacteria, clearly increase in the sub-oxic part of the chemocline compared to water above and below this depth interval. Moreover, the co-occurrence of aminopentol (17β(H),21β(H)-35-aminobacteriohopane-30,31,32,33,34-pentol) with aminotetrol (17β(H),21β(H)-35-aminobacteriohopane-31,32,33,34-tetrol) argues for members of the type I and/or type X cluster as the dominating bacterial methanotrophs. Our data indicate that aerobic rather than anaerobic methanotrophs are responsible for the strong 13C enrichment in CH4 occurring in sub-oxic waters within the oxic–anoxic transition zone of the Black Sea water column.
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  • info:eu-repo/semantics/closedAccess
Quellsystem:
Forschungsinformationssystem der UHH

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oai:www.edit.fis.uni-hamburg.de:publications/1ad6325e-94b0-4dca-8112-b2263226f52e