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| Titel |
A laboratory experiment of intact polar lipid degradation in sandy sediments |
| VerfasserIn |
J. Logemann, J. Graue, J. Köster, B. Engelen, J. Rullkötter, H. Cypionka |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 8, no. 9 ; Nr. 8, no. 9 (2011-09-13), S.2547-2560 |
| Datensatznummer |
250006119
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| Publikation (Nr.) |
 copernicus.org/bg-8-2547-2011.pdf |
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| Zusammenfassung |
| Intact polar lipids (IPLs) are considered biomarkers for living biomass.
Their degradation in marine sediments, however, is poorly understood and
complicates interpretation of their occurrence in geological samples. To
investigate the turnover of IPLs, a degradation experiment with anoxic sandy
sediments from the North Sea was conducted. Intact cells of two organisms
that do not naturally occur in North Sea sediments were chosen as IPL
sources: (i) Saccharomyces cerevisiae, representative for ester-bound acyl lipids that also occur in
Bacteria, and (ii) the archaeon Haloferax volcanii, representative for ether-bound isoprenoid lipids.
Surprisingly, IPLs with phosphoester-bound head groups showed approximately
the same degradation rate as IPLs with glycosidic head groups. Furthermore,
the results indicate a relatively fast degradation of S. cerevisiae IPLs with ester-bound
moieties (analogs of bacterial membrane lipids) and no significant
degradation of archaeal IPLs with ether-bound moieties. Pore water and 16S
rRNA-based DGGE analysis showed only a minor influence of the IPL source on
microbial metabolism and community profiles. Due to our results, the
IPL-based quantification of Archaea and Bacteria should be interpreted with caution. |
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