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| Titel |
Effect of ocean acidification on the fatty acid composition of a natural plankton community |
| VerfasserIn |
E. Leu, M. Daase, K. G. Schulz, A. Stuhr, U. Riebesell |
| 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. 2 ; Nr. 10, no. 2 (2013-02-20), S.1143-1153 |
| Datensatznummer |
250017524
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| Publikation (Nr.) |
 copernicus.org/bg-10-1143-2013.pdf |
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| Zusammenfassung |
| The effect of ocean acidification on the fatty acid composition of a natural
plankton community in the Arctic was studied in a large-scale mesocosm
experiment, carried out in Kongsfjorden (Svalbard, Norway) at 79° N. Nine mesocosms of ~50 m3 each were exposed to 8
different pCO2 levels (from natural background conditions to
~1420 μatm), yielding pH values (on the total scale)
from ~8.3 to 7.5. Inorganic nutrients were added on day 13.
The phytoplankton development during this 30-day experiment passed three
distinct phases: (1) prior to the addition of inorganic nutrients, (2) first
bloom after nutrient addition, and (3) second bloom after nutrient addition.
The fatty acid composition of the natural plankton community was analysed
and showed, in general, high percentages of polyunsaturated fatty acids
(PUFAs): 44–60% of total fatty acids. Positive correlations with
pCO2 were found for most PUFAs during phases 2 and/or 3, with the
exception of 20:5n3 (eicosapentaenoic acid, EPA), an important diatom
marker. These correlations are probably linked to changes in taxonomic
composition in response to pCO2. While diatoms (together with
prasinophytes and haptophytes) increased during phase 3 mainly in the low
and intermediate pCO2 treatments, dinoflagellates were favoured by high
CO2 concentrations during the same time period. This is reflected in
the development of group-specific fatty acid trophic markers. No indications
were found for a generally detrimental effect of ocean acidification on the
planktonic food quality in terms of essential fatty acids. |
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