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| Titel |
Net Loss of CaCO3 from a subtropical calcifying community due to seawater acidification: mesocosm-scale experimental evidence |
| VerfasserIn |
A. J. Andersson, I. B. Kuffner, F. T. Mackenzie, P. L. Jokiel, K. S. Rodgers, A. Tan |
| 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 ; 6, no. 8 ; Nr. 6, no. 8 (2009-08-27), S.1811-1823 |
| Datensatznummer |
250003963
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| Publikation (Nr.) |
 copernicus.org/bg-6-1811-2009.pdf |
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| Zusammenfassung |
| Acidification of seawater owing to oceanic uptake of atmospheric CO2
originating from human activities such as burning of fossil fuels and
land-use changes has raised serious concerns regarding its adverse effects
on corals and calcifying communities. Here we demonstrate a net loss of
calcium carbonate (CaCO3) material as a result of decreased
calcification and increased carbonate dissolution from replicated
subtropical coral reef communities (n=3) incubated in continuous-flow
mesocosms subject to future seawater conditions. The calcifying community
was dominated by the coral Montipora capitata. Daily average community calcification or Net
Ecosystem Calcification (NEC=CaCO3 production – dissolution) was
positive at 3.3 mmol CaCO3 m−2 h−1 under ambient seawater
pCO2 conditions as opposed to negative at −0.04 mmol CaCO3 m−2 h−1
under seawater conditions of double the ambient
pCO2. These experimental results provide support for the conclusion that
some net calcifying communities could become subject to net dissolution in
response to anthropogenic ocean acidification within this century.
Nevertheless, individual corals remained healthy, actively calcified (albeit
slower than at present rates), and deposited significant amounts of
CaCO3 under the prevailing experimental seawater conditions of elevated
pCO2. |
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