CO 3 concentration and pCO2 thresholds for calcification and dissolution on the Molokai reef flat, Hawaii K. K. Yates and R. B. Halley U.S. Geological Survey, Center for Coastal and Watershed Studies, St. Petersburg, FL 33701, USA Received: 5 December 2005 – Accepted: 22 December 2005 – Published: 31 January 2006 Correspondence to: K. K. Yates ([email protected]) © 2006 Author(s). This work is li...