Fig. 3. Action spectra of tentacle contraction in Favia favus and Plerogyra sinuosa (filled circles). Values are means ± S.D., N=5. (A) Comparison of the action spectrum of F. favus tentacle contraction to the light spectrum absorbed by the zooxanthellae at an irradiance level of 30 µmol quanta m^-2 s^-1 (open squares) (Pearson's correlation, r=-0.7557, P<0.0007). (B) Comparison of the action spectrum of F. favus tentacle contraction to the light spectrum absorbed by the zooxanthellae at an irradiance level of 10 µmol quanta m^-2 s^-1 (open squares) (Pearson's correlation, r=-0.8543, P<0.0001). (C) Comparison of the action spectrum (in vitro) of P. sinuosa tentacle contraction to the light spectrum absorbed by the zooxanthellae at an irradiance level of 30 µmol quanta m^-2 s^-1 (open squares) (Pearson's correlation r=-0.8667, P<0.0001, N=3).

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