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| Titel |
Secondary calcification and dissolution respond differently to future ocean conditions |
| VerfasserIn |
N. J. Silbiger, M. J. Donahue |
| 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 ; 12, no. 2 ; Nr. 12, no. 2 (2015-01-29), S.567-578 |
| Datensatznummer |
250117790
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| Publikation (Nr.) |
 copernicus.org/bg-12-567-2015.pdf |
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| Zusammenfassung |
| Climate change threatens both the accretion and erosion processes that
sustain coral reefs. Secondary calcification, bioerosion, and reef
dissolution are integral to the structural complexity and long-term
persistence of coral reefs, yet these processes have received less research
attention than reef accretion by corals. In this study, we use climate
scenarios from RCP 8.5 to examine the combined effects of rising ocean
acidity and sea surface temperature (SST) on both secondary calcification and
dissolution rates of a natural coral rubble community using a flow-through
aquarium system. We found that secondary reef calcification and dissolution
responded differently to the combined effect of pCO2 and temperature.
Calcification had a non-linear response to the combined effect of pCO2
and temperature: the
highest calcification rate occurred slightly above ambient conditions and the
lowest calcification rate was in the highest temperature–pCO2
condition. In contrast, dissolution increased linearly with temperature–pCO2
. The rubble community switched from net calcification to net
dissolution at +271 μatm pCO2 and 0.75 °C above
ambient conditions, suggesting that rubble reefs may shift from net
calcification to net dissolution before the end of the century. Our results
indicate that (i) dissolution may be more sensitive to climate change than
calcification and (ii) that calcification and dissolution have different
functional responses to climate stressors; this highlights the need to study
the effects of climate stressors on both calcification and dissolution to
predict future changes in coral reefs. |
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