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| Titel |
Sink or link? The bacterial role in benthic carbon cycling in the Arabian Sea's oxygen minimum zone |
| VerfasserIn |
L. Pozzato, D. Oevelen, L. Moodley, 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 ; 10, no. 11 ; Nr. 10, no. 11 (2013-11-02), S.6879-6891 |
| Datensatznummer |
250085389
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| Publikation (Nr.) |
 copernicus.org/bg-10-6879-2013.pdf |
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| Zusammenfassung |
| The bacterial loop, the consumption of dissolved organic matter (DOM) by
bacteria and subsequent transfer of bacterial carbon to higher trophic
levels, plays a prominent role in pelagic food webs. However, its role in
sedimentary ecosystems is not well documented. Here we present the results
of isotope tracer experiments performed under in situ oxygen conditions in
sediments from inside and outside the Arabian Sea's oxygen minimum zone (OMZ)
to study the importance of the microbial loop in this setting. Particulate
organic matter, added as phytodetritus, was processed by bacteria, protozoa
and metazoans, while dissolved organic matter was processed only by bacteria
and there was very little, if any, transfer to higher trophic levels within
the 7 day experimental period. This lack of significant transfer
of bacterial-derived carbon to metazoan consumers indicates that the
bacterial loop is rather inefficient, in sediments both inside and outside
the OMZ. Moreover, metazoans directly consumed labile
particulate organic matter resources and thus competed with bacteria for
phytodetritus. |
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