Table II. O₂ fluxes in Trichodesmium IMS101 according to the method of Peltier and Thibault (1985).

Values represent rates measured between 2 to 3 h (am) and 6 to 7 h (pm) after the beginning of the photoperiod. Blanks denote no measurement. Errors are ±1 sd (n ≥ 3). No sd is given when only one measurement was obtained.

Oxygen Fluxes	Assay Condition		Acclimation
			Low Light (50 μmol Photons m−2 s−1)		High Light (200 μmol Photons m−2 s−1)
			150 μatm pCO2	900 μatm pCO2	150 μatm pCO2	900 μatm pCO2
Gross O2 evolution (μmol O2 mg chl a−1 h−1)	Low light	am	143 ± 16	119 ± 22
		pm	156 ± 4	135 ± 17
	High light	am	453	538 ± 70	454 ± 28	534 ± 51
		pm	612	429 ± 42	486 ± 81	432 ± 153
O2 uptake in the light (μmol O2 mg chl a−1 h−1)	Low light	am	81 ± 21	46 ± 18
		pm	27 ± 12	23 ± 23
	High light	am	200	137 ± 33	254 ± 49	117 ± 42
		pm	81	83 ± 62	115 ± 57	123 ± 27
O2 uptake in the dark (μmol O2 mg chl a−1 h−1)	No light	am	115 ± 10	83 ± 11	106 ± 44	126 ± 30
		pm	25 ± 8	24 ± 7	67 ± 13	111 ± 24