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| Titel |
Effects of long-term high CO2 exposure on two species of coccolithophores |
| VerfasserIn |
M. N. Müller, K. G. Schulz, 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 ; 7, no. 3 ; Nr. 7, no. 3 (2010-03-23), S.1109-1116 |
| Datensatznummer |
250004596
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| Publikation (Nr.) |
 copernicus.org/bg-7-1109-2010.pdf |
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| Zusammenfassung |
| The physiological performance of two coccolithophore species,
Emiliania huxleyi and Coccolithus braarudii, was
investigated during long-term exposure to elevated pCO2 levels.
Mono-specific cultures were grown over 152 (E. huxleyi) and 65 (C. braarudii)
generations while pCO2 was gradually increased to maximum levels of 1150 μatm
(E. huxleyi) and 930 μatm (C. braarudii) and kept constant
thereafter. Rates of cell growth and cell quotas of particulate organic
carbon (POC), particulate inorganic carbon (PIC) and total particulate
nitrogen (TPN) were determined repeatedly throughout the incubation period.
Increasing pCO2 caused a decrease in cell growth rate of 9% and 29% in E. huxleyi
and C. braarudii, respectively. In both species cellular PIC:TPN and PIC:POC
ratios decreased in response to rising pCO2, whereas no change was observed in
the POC:TPN ratios of E. huxleyi and C. braarudii. These results are consistent with
those obtained in shorter-term high CO2 exposure experiments following
abrupt pertubations of the seawater carbonate system and indicate that for
the strains tested here a gradual CO2 increase does not alleviate CO2/pH sensitivity. |
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