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| Titel |
Individual and interacting effects of pCO2 and temperature on Emiliania huxleyi calcification: study of the calcite production, the coccolith morphology and the coccosphere size |
| VerfasserIn |
C. Bodt, N. Oostende, J. Harlay, K. Sabbe, L. Chou |
| 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. 5 ; Nr. 7, no. 5 (2010-05-05), S.1401-1412 |
| Datensatznummer |
250004761
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| Publikation (Nr.) |
 copernicus.org/bg-7-1401-2010.pdf |
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| Zusammenfassung |
| The impact of ocean acidification and increased water temperature on marine
ecosystems, in particular those involving calcifying organisms, has been
gradually recognised. We examined the individual and combined effects of
increased pCO2 (180 ppmV CO2, 380 ppmV CO2 and 750 ppmV CO2
corresponding to past, present and future CO2 conditions,
respectively) and temperature (13 °C and 18 °C) during the exponential
growth phase of the coccolithophore E. huxleyi using batch culture experiments. We
showed that cellular production rate of Particulate Organic Carbon (POC)
increased from the present to the future CO2 treatments at 13 °C. A
significant effect of pCO2 and of temperature on calcification was
found, manifesting itself in a lower cellular production rate of Particulate
Inorganic Carbon (PIC) as well as a lower PIC:POC ratio at future CO2
levels and at 18 °C. Coccosphere-sized particles showed a size reduction
with both increasing temperature and CO2 concentration. The influence
of the different treatments on coccolith morphology was studied by
categorizing SEM coccolith micrographs. The number of well-formed coccoliths
decreased with increasing pCO2 while temperature did not have a
significant impact on coccolith morphology. No interacting effects of
pCO2 and temperature were observed on calcite production, coccolith
morphology or on coccosphere size. Finally, our results suggest that ocean
acidification might have a larger adverse impact on coccolithophorid
calcification than surface water warming. |
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