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| Titel |
Low temporal variation in the intact polar lipid composition of North Sea coastal marine water reveals limited chemotaxonomic value |
| VerfasserIn |
J. Brandsma, E. C. Hopmans, C. J. M. Philippart, M. J. W. Veldhuis, S. Schouten, J. S. Sinninghe Damsté |
| 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 ; 9, no. 3 ; Nr. 9, no. 3 (2012-03-22), S.1073-1084 |
| Datensatznummer |
250006845
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| Publikation (Nr.) |
 copernicus.org/bg-9-1073-2012.pdf |
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| Zusammenfassung |
| Temporal variations in the abundance and composition of intact polar lipids
(IPLs) in North Sea coastal marine water were assessed over a one-year
seasonal cycle, and compared with environmental parameters and the microbial
community composition. Sulfoquinovosyldiacylglycerol (SQDG) was the most
abundant IPL class, followed by phosphatidylcholine (PC),
phosphatidylglycerol (PG) and diacylglyceryl-(N,N,N)-trimethylhomoserine (DGTS)
in roughly equal concentrations, and smaller amounts of
phosphatidylethanolamine (PE). Although the total concentrations of these
IPL classes varied substantially throughout the year, the composition of the
IPL pool remained remarkably constant. Statistical analysis yielded negative
correlations between IPL concentrations and dissolved inorganic nutrient
concentrations, but no changes in the overall planktonic IPL composition due
to nutrient limitation were observed. Significant correlations between SQDG,
PC, PG and DGTS concentrations and chlorophyll a concentrations and algal
abundances indicated that eukaryotic primary producers, in particular
Phaeocystis globosa, were the predominant source of IPLs at this site. However, while IPL
concentrations in the water were closely tied to total algal abundances, the
rapid succession of different algal groups blooming throughout the year
resulted in only minor shifts in the IPL composition. Principal component
analysis showed that the IPLs were derived from multiple sources, and that
no IPL species could be exclusively assigned to a particular algal taxa or
(cyano)bacteria. Thus, the most commonly occurring IPLs appear to have
limited chemotaxonomic potential, highlighting the need to use targeted
assays of more specific biomarker IPLs. |
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