Table 2. Summary of cellular responses in C. velia grown under three different photon treatments.

	LL	HL	Sinusoidal light∶dark cycle	Response in sinusoidal cultures
Irradiance µmol photons m-2 s-1	15	200	Max. 500	Sinusoidal function
Irradiance regime	24 h continuous	24 h continuous	12 h∶12 h light∶dark
Photon dose per day mol photons m-2 day-1	1.3	17.3	13.2
Growth rate d-1	0.21±0.02	0.16±0.01	0.37±0.01
Cell size µm	6.87±0.09	5.68±0.31	6.07±0.63	no change
C quota pg cell-1	57±1	32±2	53±12	See Fig. 1A
C∶N mol∶mol	9.8±0.1	8.9±0.4	8.4±0.7	See Fig. 1B
N quota pg cell-1	6.88±0.14	4.18±0.40	6.4±1.7	See Fig. 1C
Chl a pg cell-1	0.60±0.08	0.21±0.05	0.45±0.04	no change
violaxanthin/Chl a mol∶mol	0.26±0.05	0.35±0.12	0.36±0.07	See Fig. 1D
isofucoxanthin/Chl a mol∶mol	0.58±0.11	0.72±0.23	0.91±0.11	See Fig. 1D
ß,ß-carotene/Chl a mol∶mol	0.030±0.006	0.034±0.009	0.045±0.007	no change
total carotenoids/Chl a mol∶mol	0.87±0.15	1.11±0.31	1.31±0.18	See Fig. 1D
Chl a specific absorption of PSII a*PSII	0.0071±0.0002	0.0101±0.0003	0.0109±0.0003	Not shown