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| Titel |
DON as a source of bioavailable nitrogen for phytoplankton |
| VerfasserIn |
D. A. Bronk, J. H. See, P. Bradley, L. Killberg |
| 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 (2007-05-24), S.283-296 |
| Datensatznummer |
250001726
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| Publikation (Nr.) |
 copernicus.org/bg-4-283-2007.pdf |
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| Zusammenfassung |
| Relative to inorganic nitrogen, concentrations of dissolved organic nitrogen
(DON) are often high, even in regions believed to be nitrogen-limited. The
persistence of these high concentrations led to the view that the DON pool
was largely refractory and therefore unimportant to plankton nutrition. Any
DON that was utilized was believed to fuel bacterial production. More recent
work, however, indicates that fluxes into and out of the DON pool can be
large, and that the constancy in concentration is a function of tightly
coupled production and consumption processes. Evidence is also accumulating
which indicates that phytoplankton, including a number of harmful species,
may obtain a substantial part of their nitrogen nutrition from organic
compounds. Ongoing research includes ways to discriminate between
autotrophic and heterotrophic utilization, as well as a number of
mechanisms, such as cell surface enzymes and photochemical decomposition,
that could facilitate phytoplankton use of DON components. |
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