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Titel |
A model for variable phytoplankton stoichiometry based on cell protein regulation |
VerfasserIn |
J. A. Bonachela, S. D. Allison, A. C. Martiny, S. A. Levin |
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. 6 ; Nr. 10, no. 6 (2013-06-27), S.4341-4356 |
Datensatznummer |
250018316
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Publikation (Nr.) |
copernicus.org/bg-10-4341-2013.pdf |
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Zusammenfassung |
The elemental ratios of marine phytoplankton emerge from complex
interactions between the biotic and abiotic components of the ocean,
and reflect the plastic response of individuals to changes in their
environment. The stoichiometry of phytoplankton is, thus, dynamic
and dependent on the physiological state of the cell. We present
a theoretical model for the dynamics of the carbon, nitrogen and
phosphorus contents of a phytoplankton population. By representing
the regulatory processes controlling nutrient uptake, and focusing
on the relation between nutrient content and protein synthesis, our
model qualitatively replicates existing experimental observations
for nutrient content and ratios. The population described by our
model takes up nutrients in proportions that match the input ratios
for a broad range of growth conditions. In addition, there are two
zones of single-nutrient limitation separated by a wide zone of
co-limitation. Within the co-limitation zone, a single point can be
identified where nutrients are supplied in an optimal ratio.
When different species compete, the existence of a wide co-limitation zone implies
a more complex pattern of coexistence and exclusion compared to previous model predictions.
However, additional comprehensive laboratory
experiments are needed to test our predictions. Our model
contributes to the understanding of the global cycles of oceanic
nitrogen and phosphorus, as well as the elemental ratios of these
nutrients in phytoplankton populations. |
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