Table 3 Calculated optimum light intensities, maximum rates (V_max) and light \({\rm{K}}\tfrac{1}{2}\) values of S. apsteinii at 20 °C and 85, 213, 420, 710 and 1430 μatm using equation 2 and fit coefficients from Table 1.

Light	85 μatm	213 μatm	420 μatm	710 μatm	1430 μatm
Optima ( μ mol photons m ^{− 2} s ^{− 1} )
Calcification	157	139	130	125	120
Photosynthesis	263	203	169	149	129
Growth rate	196	161	143	133	123
V _max (pg C cell ⁻¹ d ⁻¹ or d ⁻¹ )
Calcification	85.6	172.9	247.9	239.6	145.7
Photosynthesis	123.6	211.4	262.1	250.3	176.6
Growth rate	0.30	0.43	0.49	0.46	0.34
\({\bf{K}}\tfrac{1}{2}{}_{{\bf{PAR}}}{\bf{i}}{\bf{nhib}}\) ( μ mol photons m ^{− 2} s ^{− 1} )
Calcification	>2500	1050	548	423	386
Photosynthesis	>2500	1346	754	561	448
Growth rate	>2500	1524	894	667	521
\({\bf{K}}\tfrac{1}{2}{}_{{\bf{PAR}}}{\bf{s}}{\bf{at}}\) ( μ mol photons m ^{− 2} s ^{− 1} )
Calcification	7.2	18.3	30.6	36.8	37.4
Photosynthesis	18.4	30.6	38.0	39.7	37.1
Growth rate	9.9	17.0	22.8	26.4	28.8

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