 |
| Titel |
Intact polar lipids of Thaumarchaeota and anammox bacteria as indicators of N cycling in the eastern tropical North Pacific oxygen-deficient zone |
| VerfasserIn |
M. Sollai, E. C. Hopmans, S. Schouten, R. G. Keil, J. S. Sinninghe Damsté |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1726-4170
|
| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 12, no. 15 ; Nr. 12, no. 15 (2015-08-06), S.4725-4737 |
| Datensatznummer |
250118055
|
| Publikation (Nr.) |
 copernicus.org/bg-12-4725-2015.pdf |
|
|
|
|
|
| Zusammenfassung |
| In the last decade our understanding of the marine nitrogen cycle has
improved considerably thanks to the discovery of two novel groups of
microorganisms: ammonia-oxidizing archaea (AOA) and anaerobic
ammonia-oxidizing (anammox) bacteria. Both groups are important in oxygen-deficient zones (ODZs), where they substantially affect the marine N budget.
These two groups of microbes are also well known for producing specific
membrane lipids, which can be used as biomarkers to trace their presence in
the environment. We investigated the occurrence and distribution of AOA and
anammox bacteria in the water column of the eastern tropical North Pacific
(ETNP) ODZ, one of the most prominent ODZs worldwide. Suspended particulate
matter (SPM) was collected at different depths of the water column in high resolution, at both a coastal and an open-ocean setting. The SPM was analyzed
for AOA- and anammox bacteria-specific intact polar lipids (IPLs), i.e.,
hexose-phosphohexose (HPH)-crenarchaeol and phosphatidylcholine
(PC)-monoether ladderane. Comparison with oxygen profiles reveals that both
the microbial groups are able to thrive at low (< 1 μM)
concentrations of oxygen. Our results indicate a clear niche segregation of
AOA and anammox bacteria in the coastal waters of the ETNP but a partial
overlap of the two niches of these microbial species in the open-water
setting. The latter distribution suggests the potential for an interaction
between the two microbial groups at the open-ocean site, although the nature
of this hypothetical interaction (i.e., either competition or cooperation)
remains unclear. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|