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Net loss of CaCO3 from coral reef communities due to human induced seawater acidification
1Bermuda Institute of Ocean Sciences, St. George's, Bermuda
2US Geological Survey, Florida Integrated Science Center, St. Petersburg, FL, USA
3Department of Oceanography, University of Hawaii, Honolulu, HI, USA
4Hawaii Institute of Marine Biology, Kaneohe, HI, USA
Abstract. 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 for its adverse effects on corals, coral reefs and carbonate communities in general. Here we demonstrate a transition from net accumulation towards net loss of calcium carbonate (CaCO3) material owing to decreased calcification and increased carbonate dissolution from replicated subtropical coral reef communities (n=3) incubated in continuous-flow mesocosms subject to present and 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 4.5 mmol CaCO3 m−2 h−1 under ambient seawater pCO2 conditions as opposed to negative at −0.1 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.
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Citation: Andersson, A. J., Kuffner, I. B., Mackenzie, F. T., Jokiel, P. L., Rodgers, K. S., and Tan, A.: Net loss of CaCO3 from coral reef communities due to human induced seawater acidification, Biogeosciences Discuss., 6, 2163-2182, 2009. Bibtex EndNote Reference Manager
