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| Titel |
Effect of ocean acidification on an Arctic phytoplankton community |
| VerfasserIn |
Signe Klavsen, Richard Bellerby, Corina Brussaard, Susan Kimmance, Michael Meyerhöfer, Kai Georg Schulz, Ulf Riebesell |
| 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 |
250052827
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| Zusammenfassung |
| Ocean acidification (OA) is thought to influence cold regions first and hardest due to the high
solubility of CO2 and the resulting low carbonate saturation state. Therefore, a large CO2
mesocosm perturbation experiment was carried out in the Kongsfjord (Spitsbergen) in
June/July 2010. The impact of OA on the phytoplankton community was monitored in nine
mesocosms (water volume ~50 m-3) with CO2 concentrations ranging from ca. 180 to 1400
ppm. The influence of CO2 was monitored before (days 0 – 12) and after (days 13 – 30)
nutrient addition (N, P and Si). The development and changes in the phytoplankton
community were determined by microscopy, pigment analysis (rp-HPLC), flow cytometry
and with a multi-fluorescence probe.
The data analysed until now indicate that the phytoplankton community composition was
not affected by elevated CO2 before nutrient addition. After nutrient addition, however, the
composition of the phytoplankton community in mesocosms with low and high CO2
developed differently: high CO2-mesocosms had higher peridinin concentrations (marker
pigment for dinoflagellates) than low CO2-mesocosms and the opposite pattern was found for
fucoxanthin (marker pigment mainly for diatoms). Thus, the preliminary results suggest that
future changes in CO2 may affect succession and distribution of phytoplankton taxonomic
groups and species and this may potentially affect the biogeochemical cycling. |
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