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| Titel |
Phospholipid synthesis rates in the eastern subtropical South Pacific Ocean |
| VerfasserIn |
B. A. S. Mooy, T. Moutin, S. Duhamel, P. Rimmelin, F. Wambeke |
| 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 ; 5, no. 1 ; Nr. 5, no. 1 (2008-02-06), S.133-139 |
| Datensatznummer |
250002233
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| Publikation (Nr.) |
 copernicus.org/bg-5-133-2008.pdf |
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| Zusammenfassung |
| Membrane lipid molecules are a major component of planktonic organisms and
this is particularly true of the microbial picoplankton that dominate the
open ocean; with their high surface-area to volume ratios, the synthesis of
membrane lipids places a major demand on their overall cell metabolism. Specifically, the
synthesis of cell membrane phospholipids creates a
demand for the nutrient phosphorus, and we sought to refine our
understanding of the role of phospholipids in the upper ocean phosphorus
cycle. We measured the rates of phospholipid synthesis in a transect of the
eastern subtropical South Pacific from Easter Island to Concepcion, Chile as
part of the BIOSOPE program. Our approach combined standard phosphorus
radiotracer incubations and lipid extraction methods. We found that
phospholipid synthesis rates varied from less than 1 to greater than 200 pmol P L−1 h−1, and that phospholipid synthesis contributed
between less than 5% to greater than 22% of the total PO43−
incorporation rate. Changes in the percentage that phospholipid synthesis
contributed to total PO43− uptake were strongly correlated
with the ratio of primary production to bacterial production, which
supported our hypothesis that heterotrophic bacteria were the primary agents
of phospholipid synthesis. The spatial variation in phospholipid synthesis
rates underscored the importance of heterotrophic bacteria in the phosphorus
cycle of the eastern subtropical South Pacific, particularly the
hyperoligotrophic South Pacific subtropical gyre. |
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