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| Titel |
Bacterial methane oxidation in peat bogs |
| VerfasserIn |
J. F. van Winden, N. Kip, G. J. Reichart, M. S. M. Jetten, H. J. M. Op den Camp, J. S. Sinninghe Damsté |
| 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 |
250025253
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| Zusammenfassung |
| Symbiotic methane oxidizing bacteria (methanotrophs) in peat moss (Sphagnum) reduce
methane emissions from peat bogs and provide CO2for photosynthesis, leading to effective in
situ carbon recycling(Raghoebarsing et al., Nature, 2005). To gain further insight into this
symbiosis, distinct Sphagnum species were collected from different microhabitats
within peat bogs from various countries, including Great Britain, Russia, Canada and
Argentina. We tested them for methane oxidation activity at different temperatures, and
incubated selected mosses with 99% 13C-labelled methane to confirm the presence of
methanotrophs.
Sphagnum mosses sampled around the world showed methane oxidation activity,
demonstrating the global occurrence of the symbiosis. The presence of methanotrophs
was substantiated by incorporation of methane-derived label into bacterial lipids
(C32-17β,21β-hopanol, liberated from tetrafunctionalised hopanoids) extracted from
Sphagnum. The degree of labelling in pool-derived Sphagnum was substantially higher
compared to the same Sphagnum species from a lawn setting. The methanotrophic activity in
pools is most likely higher because of greater methane availability. Variability in label
incorporation between various Sphagnum species derived from similar settings in different
bogs was relatively small. Sphagnum-derived sterols also showed label incorporation when
Sphagnum was submerged, suggesting that methane-derived CO2 is an important carbon
source under these conditions, when atmospheric CO2 is limiting. Additionally,
methanotrophic activity increased at higher temperatures, potentially providing a
negative feedback to enhanced methane release as a consequence of (global) warming. |
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