Articles | Volume 17, issue 4
https://doi.org/10.5194/bg-17-887-2020
https://doi.org/10.5194/bg-17-887-2020
Research article
 | 
21 Feb 2020
Research article |  | 21 Feb 2020

Intercomparison of four methods to estimate coral calcification under various environmental conditions

Miguel Gómez Batista, Marc Metian, François Oberhänsli, Simon Pouil, Peter W. Swarzenski, Eric Tambutté, Jean-Pierre Gattuso, Carlos M. Alonso Hernández, and Frédéric Gazeau

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Cited articles

Albright, R., Takeshita, Y., Koweek, D. A., Ninokawa, A., Wolfe, K., Rivlin, T., Nebuchina, Y., Young, J., and Caldeira, K.: Carbon dioxide addition to coral reef waters suppresses net community calcification, Nature, 555, 516–519, https://doi.org/10.1038/nature25968, 2018. 
Cao, Z. and Dai, M.: Shallow-depth CaCO3 dissolution: Evidence from excess calcium in the South China Sea and its export to the Pacific Ocean, Global Biogeochem. Cy., 25, GB2019, https://doi.org/10.1029/2009GB003690, 2011. 
Chisholm, J. R. M. and Gattuso, J.-P.: Validation of the alkalinity anomaly technique for investigating calcification and photosynthesis in coral reef communities, Limnol. Oceanogr., 36, 1232–1239, 1991. 
Cohen, S., Krueger, T., and Fine, M.: Measuring coral calcification under ocean acidification: methodological considerations for the 45Ca-uptake and total alkalinity anomaly technique, PeerJ, 5, e3749, https://doi.org/10.7717/peerj.3749, 2017. 
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In this paper, we assessed four methods (total alkalinity anomaly, calcium anomaly, 45Ca incorporation, and 13C incorporation) to determine coral calcification of a reef-building coral. Under all conditions (light vs. dark incubations and ambient vs. lowered pH levels), calcification rates estimated using the alkalinity and calcium anomaly techniques as well as 45Ca incorporation were highly correlated, while significantly different results were obtained with the 13C incorporation technique.
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