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| Titel |
Influence of consumer-driven nutrient recycling on primary production and the distribution of N and P in the ocean |
| VerfasserIn |
A. Nugraha, P. Pondaven, P. Tréguer |
| 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 ; 7, no. 4 ; Nr. 7, no. 4 (2010-04-21), S.1285-1305 |
| Datensatznummer |
250004668
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| Publikation (Nr.) |
 copernicus.org/bg-7-1285-2010.pdf |
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| Zusammenfassung |
| In this study we investigated the impact of consumer-driven nutrient
recycling (CNR) on oceanic primary production and the distribution of
nitrogen (N) and phosphorus (P) in the deep ocean. For this purpose, we used
and extended two existing models: a 2-box model of N and P cycling in the
global ocean (Tyrrell, 1999), and the model of Sterner (1990)
which formalised the principles of CNR theory. The resulting model showed that
marine herbivores may affect the supply and the
stoichiometry of N and P in the ocean, thereby exerting a control on global
primary production. The predicted global primary production was higher when
herbivores were included in the model, particularly when these herbivores
had higher N:P ratios than phytoplankton. This higher primary production was
triggered by a low N:P resupply ratio, which, in turn, favoured the
P-limited N2-fixation and eventually the N-limited non-fixers.
Conversely, phytoplankton with higher N:P ratios increased herbivore yield
until phosphorus became the limiting nutrient, thereby favouring herbivores
with a low P-requirement. Finally, producer-consumer interactions fed back
on the N and P inventories in the deep ocean through differential nutrient
recycling. In this model, N deficit or N excess in the deep ocean resulted
not only from the balance between N2-fixation and denitrification, but
also from CNR, especially when the elemental composition of producers and
consumers differed substantially. Although the model is fairly simple, these
results emphasize our need for a better understanding of how consumers
influence nutrient recycling in the ocean. |
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