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| Titel |
Potential production of nitrous oxide by archaea in the eastern Tropical North Atlantic Ocean |
| VerfasserIn |
C. Loescher, A. Kock, H. Bange, J. LaRoche |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250019788
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| Zusammenfassung |
| The greenhouse gas nitrous oxide (N2O) is mainly produced by the processes of nitrification
and denitrification. In order to identify the major formation pathway in the eastern
tropical North Atlantic Ocean, measurements of dissolved nitrous oxide along vertical
profiles were made during a cruise in February 2007. Identification of possible
producing organsims took place by DNA and RNA analysis. The present oxygen
concentrations, as well as the absence of transcripts of the denitrification key genes
nirS/K and nosZ indicate, that N2O formation did not take place via denitrification.
However, a positive correlation of N2O with nitrate, as well as excess N2O with the
apparent oxygen utilization, suggest that nitrification is the major formation pathway in
the study area. Detection of amoA, the key gene for the oxidation of ammonia
approved this observation. It was found, that transcripts of amoA deriving from archaea
were found throughout the water column, whereas transcripts of bacterial amoA
could not be detected. Therefore, a production of N2O via archaeal nitrification is
suggested. |
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