. 2010 Mar 10;2010:plq004. doi: 10.1093/aobpla/plq004

Table 2.

Cardinal points of light–response curves for lichens with and without a cortex. Absorptivity, proportion of photosynthetically active radiation that is absorbed; F_v/F_m, maximum quantum yield in the dark-adapted state; NPQ, non-photochemical quenching at a PFD of 70 µmol m⁻²s⁻¹; Φ, quantum efficiency; ETR_max, maximum electron transport rate; PFD_sat, photon flux density at 0.9 ETR_max; θ, convexity value. The latter four are derived by the fitted model. Means are shown with 1 SD (n = 14–20). If superscripts are the same, means cannot be distinguished significantly by Tukey's HSD or Fisher's LSD (in parentheses) at the P = 0.05 significance level. Numbers indicate transformation used for statistical testing: 1, log; 2, arcsinus transformation. Means are back transformed in this table.

	Edge		Interior
	Cortex	No cortex	Cortex	No cortex
Absorptivity	0.84 ± 0.05^a	0.69 ± 0.05^b	0.83 ± 0.03^a	0.73 ± 0.06^b(c)
F_v/F_m	0.58 ± 0.06^a	0.58 ± 0.06^ab(a)	0.58 ± 0.04^a	0.53 ± 0.07^b
NPQ¹	0.43 ± 0.28^a	0.41 ± 0.21^a	0.34 ± 0.26^a	0.43 ± 0.16^a
Φ	0.173 ± 0.04^a	0.119 ± 0.03^b	0.158 ± 0.04^a	0.118 ± 0.03^b
ETR_max¹	4.6 ± 1.5^a	3.6 ± 2.1^a	3.6 ± 2.4^a	1.8 ± 1.1^b
PFD_sat¹	45.7 ± 21.4^a	49.7 ± 31.1^a	46.8 ± 35.6^a	20.8 ± 7.9^b
θ²	0.89 ± 0.09^a	0.90 ± 0.09^a	0.84 ± 0.19^a	0.91 ± 0.08^a