Present address: Environmental and Biomolecular Systems, OGI School of Science and Engineering, Oregon Health and Science University, 20000 NW Walker Rd., Beaverton, OR 97006, USA. E-mail: firstname.lastname@example.org.
BICARBONATE STIMULATION OF CALCIFICATION AND PHOTOSYNTHESIS IN TWO HERMATYPIC CORALS1
Article first published online: 6 FEB 2008
© 2008 Phycological Society of America
Journal of Phycology
Volume 44, Issue 1, pages 91–98, February 2008
How to Cite
Herfort, L., Thake, B. and Taubner, I. (2008), BICARBONATE STIMULATION OF CALCIFICATION AND PHOTOSYNTHESIS IN TWO HERMATYPIC CORALS. Journal of Phycology, 44: 91–98. doi: 10.1111/j.1529-8817.2007.00445.x
Received 13 December 2006. Accepted 26 June 2007.
- Issue published online: 6 FEB 2008
- Article first published online: 6 FEB 2008
- dissolved inorganic carbon;
A wide range of bicarbonate concentrations was used to monitor the kinetics of bicarbonate (HCO3−) use in both photosynthesis and calcification in two reef-building corals, Porites porites and Acropora sp. Experiments carried out close to the P. porites collection site in Barbados showed that additions of NaHCO3 to synthetic seawater proportionally increased the calcification rate of this coral until the concentration exceeded three times that of seawater (6 mM). Photosynthetic rates were also stimulated by HCO3− addition, but these became saturated at a lower concentration (4 mM). Similar experiments on aquarium-acclimated colonies of Indo-Pacific Acropora sp. showed that calcification and photosynthesis in this coral were enhanced to an even greater extent than P. porites, with calcification continuing to increase above 8 mM HCO3−, and photosynthesis saturating at 6 mM. Calcification rates of Acropora sp. were also monitored in the dark, and, although these were lower than in the light for a given HCO3− concentration, they still increased dramatically with HCO3− addition, showing that calcification in this coral is light stimulated but not light dependent.