Figure 6.

Photophysiological activity of Ward Hunt Lake mats during their recovery from osmotic stress. The mats that were incubated under increased salinities for 48 h (as in Figure 5) were transferred back to the original Ward Hunt Lake water (conductivity of 0.25 mS cm⁻¹), and their photosynthetic quantum yields (F_v/F_m) were then monitored during the subsequent 16 h. (A) Pre-incubation conditions of 0.25 (control; solid circles), 5 (open circles), 30 (closed squares), and 100 mS cm⁻¹ (open squares). (B) Pre-incubation conditions of 2.5 (control; solid circles), 10 (open circles), 150 (closed squares), and 200 mS cm⁻¹ (open squares).