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First published online May 2, 2008
Journal of Experimental Biology 211, 1579-1586 (2008)
Published by The Company of Biologists 2008
doi: 10.1242/jeb.016345
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Photosynthetic response of the Mediterranean zooxanthellate coral Cladocora caespitosa to the natural range of light and temperature

Riccardo Rodolfo-Metalpa1,*, Yannick Huot2 and Christine Ferrier-Pagès1

1 Centre Scientifique de Monaco, MC-98000, Principality of Monaco
2 Observatoire Océanologique de Villefranche, BP 28, 06230 Villefranche-sur-Mer, France


Figure 1
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  		Fig. 1. (A) Zooxanthellae density and (B) chlorophyll content, measured for corals either maintained at 18°C under the three light intensities, 30, 80 and 250 µmol m–2 s–1 (18°C/30; 18°C/80; 18°C/250) or at 14°C and 30 µmol m–2 s–1 (14°C/30) and 23°C and 250 µmol m–2 s–1 (23°C/250). Data are presented as mean ± s.e.m. (N=10). Chlorophyll a and c2 are shown separately but analysed as chl a+c2. Means with different letters (a, b) are significantly different (P<0.05).

 

Figure 2
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  		Fig. 2. Irradiance curves vs (A) Gross photosynthesis (Pg) and (B) relative electron transport rates (rETR; measured on the same polyps used in A). See Fig. 1 for explanation of treatments. Data are presented as mean ± s.e.m. (N=6). RLC, rapid light curve.

 

Figure 3
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  		Fig. 3. Fluorescence parameters measured during rapid light curves (RLC) followed by 5 min relaxation in the dark (RLC+Rec). (A) Effective quantum yield (Fv/F'm); (B) non-photochemical quenching (NPQ); (C) fluorescence (F); (D) maximum fluorescence (F'm). F and F'm are relative to the value at time 0.

 

Figure 4
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  		Fig. 4. Relative electron transport (rETR) rate measured on freshly isolated zooxanthellae from corals maintained at 18°C under the three light treatments (18°C/30; 18°C/80;18°C/250). Values are means ± s.e.m. (N=6).

 

Figure 5
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  		Fig. 5. (A) Relationship between the gross photosynthetic rates (Pg) and the rETR under the different temperature and light treatments (18°C/30; 18°C/80; 18°C/250; 23°C/250; 14°C/30). Data are mean ± s.e.m. (N=6). (B) The curvilinear equation for each treatment relationship.

 

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© The Company of Biologists Ltd 2008