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Journal of Marine Biology
Volume 2009, Article ID 215196, 7 pages
Research Article

Effect of Elevated Carbon Dioxide on Two Scleractinian Corals: Porites cylindrica (Dana, 1846) and Galaxea fascicularis (Linnaeus, 1767)

1Faculty of Agrotechnology and Food Science, University of Malaysia Terengganu, Kuala Terengganu 21030, Malaysia
2Faculty of Maritime and Marine Science, University of Malaysia Terengganu, Kuala Terengganu 21030, Malaysia

Received 15 June 2009; Revised 29 September 2009; Accepted 28 October 2009

Academic Editor: Andrew McMinn

Copyright © 2009 Yii-Siang Hii et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This study reveals the effect of elevated on Porites cylindrica and Galaxea fascicularis. The corals responded differently under elevated . Zooxanthellae cell density, cell mitotic index, and photosynthesis rate of P. cylindrica decreased drastically under the elevated . At the end of the experiment, P. cylindrica suffered from a declining calcium carbonate precipitation rate. G. fascicularis increased its respiration rate and expelled 71% of its symbiotic zooxanthellae algae under elevated . Photosynthetic pigments in the remaining zooxanthellae algae increased from 1.85 to 11.5 times to sustain its photosynthetic outputs. At the end of the experiment, G. fascicularis managed to increase the rate of its calcium carbonate precipitation. Increase in the atmosphere may affect species diversity of coral reefs.