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| Titel |
Response of the temperate coral Cladocora caespitosa to mid- and long-term exposure to pCO2 and temperature levels projected for the year 2100 AD |
| VerfasserIn |
R. Rodolfo-Metalpa, S. Martin, C. Ferrier-Pagès, J.-P. Gattuso |
| 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. 1 ; Nr. 7, no. 1 (2010-01-21), S.289-300 |
| Datensatznummer |
250004380
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| Publikation (Nr.) |
 copernicus.org/bg-7-289-2010.pdf |
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| Zusammenfassung |
| Atmospheric CO2 partial pressure (pCO2) is expected to
increase to 700 μatm or more by the end of the present century.
Anthropogenic CO2 is absorbed by the oceans, leading to
decreases in pH and the CaCO3 saturation state (Ω) of
the seawater. Elevated pCO2 was shown to drastically decrease
calcification rates in tropical zooxanthellate corals. Here we show,
using the Mediterranean zooxanthellate coral Cladocora
caespitosa, that an increase in pCO2, in the range predicted
for 2100, does not reduce its calcification rate. Therefore, the
conventional belief that calcification rates will be affected by
ocean acidification may not be widespread in temperate corals.
Seasonal change in temperature is the predominant factor controlling
photosynthesis, respiration, calcification and symbiont density. An
increase in pCO2, alone or in combination with elevated
temperature, had no significant effect on photosynthesis,
photosynthetic efficiency and calcification. The lack of sensitivity
C. caespitosa to elevated pCO2 might be due to its
slow growth rates, which seem to be more dependent on temperature
than on the saturation state of calcium carbonate in the range
projected for the end of the century. |
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