Table 4.

Photosynthesis light variables of three Nostoc species at 15 °C

Species	Pmax		Pmax/dark respiration	Icomp (μmol m–2 s–1)	Quantum efficiency (mmol O2/mol photons)	Absorption (%)
	(nmol O2 cm–2 h–1)	(mg O2 mg Chl–1 h–1)
N. commune	353–376	2·4	2·5	9·5	19	55
N. pruniforme	552–654	2·1	10			90
N. zetterstedtii	206–409	0·7	2·0–5·8	19·3	20	96

Data are means of measurements in several series.

P_max, maximum net photosynthesis at light saturation; I_comp, light compensation point.

Sources: N. commune (K. Sand-Jensen, unpubl. data); N. pruniforme (Raun et al., 2009); N. zetterstedtii (Sand-Jensen et al., 2009b).