 |
| Titel |
Gradients in intact polar diacylglycerolipids across the Mediterranean Sea are related to phosphate availability |
| VerfasserIn |
K. J. Popendorf, T. Tanaka, M. Pujo-Pay, A. Lagaria, C. Courties, P. Conan, L. Oriol, L. E. Sofen, T. Moutin, B. A. S. Mooy |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1726-4170
|
| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 8, no. 12 ; Nr. 8, no. 12 (2011-12-20), S.3733-3745 |
| Datensatznummer |
250006253
|
| Publikation (Nr.) |
 copernicus.org/bg-8-3733-2011.pdf |
|
|
|
|
|
| Zusammenfassung |
| Intact polar membrane lipids compose a significant fraction of cellular
material in plankton and their synthesis imposes a substantial constraint on
planktonic nutrient requirements. As a part of the Biogeochemistry from the
Oligotrophic to the Ultraoligotrophic Mediterranean (BOUM) cruise we
examined the distribution of several classes of intact polar
diacylglycerolipids (IP-DAGs) across the Mediterranean, and found that
phospholipid concentration as a percent of total lipids correlated with
phosphate concentration. In addition, the ratios of non-phosphorus lipids to
phospholipids – sulfoquinovosyldiacylglycerol (SQDG) to
phosphatidylglycerol (PG), and betaine lipids to phosphatidylcholine (PC) –
were also found to increase from west to east across the Mediterranean.
Additionally, microcosm incubations from across the Mediterranean were
amended with phosphate and ammonium, and in the course of several days
nutrient amendments elicited a shift in the ratios of IP-DAGs. These
experiments were used to assess the relative contribution of community
shifts and physiological response to the observed change in IP-DAGs across
the Mediterranean. The ratio of SQDG to chlorophyll-a was also explored as an
indicator of phytoplankton response to nitrogen availability. This study is
the first to demonstrate the dynamic response of membrane lipid composition
to changes in nutrients in a natural, mixed planktonic community. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|