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| Titel |
Carbon fluxes in the Canadian Arctic: patterns and drivers of bacterial abundance, production and respiration on the Beaufort Sea margin |
| VerfasserIn |
E. Ortega-Retuerta, W. H. Jeffrey, M. Babin, S. Bélanger, R. Benner, D. Marie, A. Matsuoka, P. Raimbault, F. Joux |
| 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 ; 9, no. 9 ; Nr. 9, no. 9 (2012-09-27), S.3679-3692 |
| Datensatznummer |
250007295
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| Publikation (Nr.) |
 copernicus.org/bg-9-3679-2012.pdf |
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| Zusammenfassung |
| During August 2009, measurements of bacterial abundance and nucleic acid
content were made along with production and respiration in coastal waters of
the Beaufort Sea (Arctic Ocean), an area influenced by the Mackenzie River
inflow. The main purpose was to evaluate bacterial organic carbon processing
with respect to local sources, mainly primary production and river inputs.
Bacterial production and abundance generally decreased from river to
offshore waters and from surface to deep waters. In contrast, the percentage
of high nucleic acid bacteria was higher in deep waters rather than in
surface or river waters. Statistical analyses indicated that bacterial
production was primarily controlled by temperature and the availability of
labile organic matter, as indicated by total dissolved amino acid
concentrations. Direct comparisons of bacterial carbon demand and primary
production indicated net heterotrophy was common in shelf waters. Net
autotrophy was observed at stations in the Mackenzie River plume, suggesting
that the carbon fixed in plume waters helped fuel net heterotrophy in the
Beaufort Sea margin. |
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