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| Titel |
Spatial variation in N2-fixation rate and diazotroph activity in the Tropical Atlantic |
| VerfasserIn |
J. P. Montoya, M. Voss, D. G. Capone |
| 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 ; 4, no. 3 ; Nr. 4, no. 3 (2007-06-22), S.369-376 |
| Datensatznummer |
250001732
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| Publikation (Nr.) |
 copernicus.org/bg-4-369-2007.pdf |
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| Zusammenfassung |
| A variety of N2-fixers occur in oligotrophic waters and these
diazotrophs make a substantial contribution to the nitrogen budget of the
upper water column. A synthesis of previously published and new rate
measurements for the North Atlantic provides insight into the role of two
different groups of N2-fixers (Trichodesmium and small diazotrophs) in supporting
N2 fixation in the tropical Atlantic. The highest rates of N2
fixation occurred in the western part of the basin, but the full data set
showed no significant difference between the eastern and western parts of
the basin in overall rates of N2-fixation by the two groups of
diazotrophs. N2-fixation by Trichodesmium was strongly dominant in the western part
of the basin while small diazotrophs played a much larger role to the east
of 40° W. The reasons for this shift in dominance are unclear, as is the
identity of the small organisms fixing N2 in the water column. |
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