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| Titel |
Opportunistic feeding on various organic food sources by the cold-water coral Lophelia pertusa |
| VerfasserIn |
C. E. Mueller, A. I. Larsson, B. Veuger, J. J. Middelburg, D. van Oevelen |
| 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 ; 11, no. 1 ; Nr. 11, no. 1 (2014-01-09), S.123-133 |
| Datensatznummer |
250117108
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| Publikation (Nr.) |
 copernicus.org/bg-11-123-2014.pdf |
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| Zusammenfassung |
| The ability of the cold-water coral Lophelia pertusa to exploit different food sources was
investigated under standardized conditions in a flume. The tested food
sources, dissolved organic matter (DOM, added as dissolved free amino
acids), bacteria, algae, and zooplankton (Artemia) were deliberately enriched in
13C and 15N. The incorporation of 13C and 15N was traced
into bulk tissue, fatty acids, hydrolysable amino acids, and the skeleton
(13C only) of L. pertusa. Incorporation rates of carbon (ranging from 0.8–2.4 μg C g−1
DW d–1) and nitrogen (0.2–0.8 μg N g−1 DW d–1)
into coral tissue did not differ significantly among food
sources indicating an opportunistic feeding strategy. Although total food
assimilation was comparable among sources, subsequent food processing was
dependent on the type of food source ingested and recovery of assimilated C
in tissue compounds ranged from 17% (algae) to 35% (Artemia). De novo
synthesis of individual fatty acids by L. pertusa occurred in all treatments as
indicated by the 13C enrichment of individual phospholipid-derived
fatty acids (PLFAs) in the coral that were absent in the added food sources.
This indicates that the coral might be less dependent on its diet as a
source of specific fatty acids than expected, with direct consequences for
the interpretation of in situ observations on coral nutrition based on lipid
profiles. |
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