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| Titel |
Short-term fate of phytodetritus in sediments across the Arabian Sea Oxygen Minimum Zone |
| VerfasserIn |
J. H. Andersson, C. Woulds, M. Schwartz, G. L. Cowie, L. A. Levin, K. Soetaert, J. J. Middelburg |
| 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 ; 5, no. 1 ; Nr. 5, no. 1 (2008-01-24), S.43-53 |
| Datensatznummer |
250002226
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| Publikation (Nr.) |
 copernicus.org/bg-5-43-2008.pdf |
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| Zusammenfassung |
| The short-term fate of phytodetritus was investigated across the
Pakistan margin of the Arabian Sea at water depths ranging from 140
to 1850 m, encompassing the oxygen minimum zone
(~100–1100 m). Phytodetritus sedimentation events were
simulated by adding ~44 mmol 13C-labelled algal material
per m2 to surface sediments in retrieved cores. Cores were
incubated in the dark, at in situ temperature and oxygen concentrations.
Overlying waters were sampled periodically, and cores were recovered
and sampled (for organisms and sediments) after durations of two and
five days. The labelled carbon was subsequently traced into
bacterial lipids, foraminiferan and macrofaunal biomass, and
dissolved organic and inorganic pools. The majority of the label
(20 to 100%) was in most cases left unprocessed in the sediment at
the surface. The largest pool of processed carbon was found to be
respiration (0 to 25% of added carbon), recovered as dissolved
inorganic carbon. Both temperature and oxygen were found to
influence the rate of respiration. Macrofaunal influence was most
pronounced at the lower part of the oxygen minimum zone where it
contributed 11% to the processing of phytodetritus. |
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