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| Titel |
Calcification responses of symbiotic and aposymbiotic corals to near-future levels of ocean acidification |
| VerfasserIn |
S. Ohki, T. Irie, M. Inoue, K. Shinmen, H. Kawahata, T. Nakamura, A. Kato, Y. Nojiri, A. Suzuki, K. Sakai, R. Woesik |
| 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 ; 10, no. 11 ; Nr. 10, no. 11 (2013-11-01), S.6807-6814 |
| Datensatznummer |
250085384
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| Publikation (Nr.) |
 copernicus.org/bg-10-6807-2013.pdf |
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| Zusammenfassung |
| Increasing the acidity of ocean waters will directly threaten calcifying marine organisms such as
reef-building scleractinian corals, and the myriad of species that rely on corals for protection
and sustenance. Ocean pH has already decreased by around 0.1 pH units since the beginning of
the industrial revolution, and is expected to decrease by another 0.2–0.4 pH units by 2100. This
study mimicked the pre-industrial, present, and near-future levels of pCO2 using a precise
control system (± 5% pCO2), to assess the impact of ocean acidification on the calcification of
recently settled primary polyps of Acropora digitifera, both with and without symbionts, and
adult fragments with symbionts. The increase in pCO2 of ~100 μatm between the pre-industrial
period and the present had more effect on the calcification rate of adult A. digitifera than the
anticipated future increases of several hundreds of micro-atmospheres of pCO2. The primary
polyps with symbionts showed higher calcification rates than primary polyps without symbionts,
suggesting that: (i) primary polyps housing symbionts are more tolerant to near-future ocean
acidification than organisms without symbionts, and (ii) corals acquiring symbionts from the
environment (i.e., broadcasting species) will be more vulnerable to ocean acidification than
corals that maternally acquire symbionts. |
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