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Science 5 December 2008:
Vol. 322. no. 5907, p. 1466
DOI: 10.1126/science.1161501
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Technical Comments

Response to Comment on "Phytoplankton Calcification in a High-CO2 World"

M. Debora Iglesias-Rodriguez,1* Erik T. Buitenhuis,2 John A. Raven,3 Oscar Schofield,4 Alex J. Poulton,1 Samantha Gibbs,1 Paul R. Halloran,5 Hein J. W. de Baar6,7

Recently reported increasing calcification rates and primary productivity in the coccolithophore Emiliania huxleyi were obtained by equilibrating seawater with mixtures of carbon dioxide in air. The noted discrepancy with previously reported decreasing calcification is likely due to the previously less realistic simulation of bicarbonate due to addition of acid or base to obtain simulated future CO2 partial pressure conditions.

1 National Oceanography Centre, Southampton, University of Southampton Waterfront Campus, European Way, Southampton SO14 3ZH, UK.
2 School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ, UK.
3 Division of Plant Sciences, University of Dundee at SCRI, Scottish Crop Research Institute, Invergowrie, Dundee DD2 5DA, UK.
4 Institute of Marine and Coastal Sciences, Rutgers University, Dudley Road, New Brunswick, NJ 08901–8521, USA.
5 Department of Earth Sciences, University of Oxford, Parks Road, Oxford OX1 3PR, UK.
6 Ocean Ecosystems, University of Groningen, Post Office Box 14, 9750 AA Haren, Netherlands.
7 Royal Netherlands Institute for Sea Research, Post Office Box 59, 1790 AB Den Burg, Netherlands.

* To whom correspondence should be addressed. E-mail: dir{at}noc.soton.ac.uk

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Science. ISSN 0036-8075 (print), 1095-9203 (online)