Abstract
Recent investigations have shown the temperate scleractinian coral Cladocora caespitosa to be a new potential climate archive for the Mediterranean Sea. Whilst earlier studies have demonstrated a seasonal variation in growth rates, they were unable to distinguish which environmental parameter (light, temperature, or food) was influencing growth. In this study, the effect of these three factors on the coral physiology and calcification rate was characterized to aid the correct interpretation of skeletal trace element variations. Two temperatures (13 and 23°C), irradiances (50 and 120 μmol m−2 s−1), and feeding regimes (unfed and fed with nauplii of Artemia salina) were tested under controlled laboratory conditions on the growth, zooxanthellae density, chlorophyll (chl) content, and asexual reproduction (budding) of C. caespitosa during a 7-week factorial experiment. Unlike irradiance, which had no effect, high temperature and food supply increased the growth rates of C. caespitosa. The effect of feeding was however higher for corals maintained at low temperature, suggesting that heterotrophy is especially important during the cold season, and that temperature is the predominant factor affecting the coral’s growth. At low temperature, fed samples had higher zooxanthellae density and chl content, possibly for maximizing photosynthetic efficiency. Sexual reproduction investment of C. caespitosa was higher during favourable conditions characterised by high temperatures and zooplankton availability.
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Acknowledgments
Financial support for this project was provided both by the Marine Environmental Research Centre (La Spezia, Italy) and by the Centre Scientifique de Monaco (Monaco). Facilities were provided by Drs R. Delfanti and S. Cocito during the experiment. We thank two anonymous reviewers for their valuable suggestions that greatly improved our manuscript.
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Rodolfo-Metalpa, R., Peirano, A., Houlbrèque, F. et al. Effects of temperature, light and heterotrophy on the growth rate and budding of the temperate coral Cladocora caespitosa . Coral Reefs 27, 17–25 (2008). https://doi.org/10.1007/s00338-007-0283-1
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DOI: https://doi.org/10.1007/s00338-007-0283-1