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| Titel |
Carbon fluxes in Arctic plankton communities under elevated CO2 levels: a stable isotope labelling study |
| VerfasserIn |
Anna de Kluijver, Karline Soetaert, Ulf Riebesell, Jack J. Middelburg |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250048641
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| Zusammenfassung |
| The potential impact of rising CO2 on carbon fluxes in natural plankton communities in the
Arctic Ocean was investigated during the 2010 EPOCA mesocosm study in Ny Ålesund,
Svalbard. Nine mesocosms were set up with a range in initial pCO2 levels from ~180 μatm
to ~1400 μatm for 5 weeks. 13C labelled bicarbonate was added to follow the transfer of
carbon from dissolved inorganic carbon (DIC) into phytoplankton and subsequently into
dissolved organic carbon (DOC), heterotrophic bacteria, zooplankton, and settling particles.
Isotope ratios of group-specific polar lipid fatty acids (PLFA) were used to infer the biomass
and production of different groups of phytoplankton and heterotrophic bacteria.
Phytoplankton PLFA showed enrichment within one day after label addition, but label
incorporation in green algae and cryptophyte PLFA was much faster than that in diatom and
dinophyte PLFA. Bacteria PLFA showed enrichment within 2 days, indicating a tight
phytoplankton-bacteria coupling. Both PLFA label incorporation and concentrations did not
reveal a clear CO2 effect on algal and bacterial dynamics. Modelling will be applied to
analyze possible CO2 effects on carbon transfer within the plankton community. |
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