Figure 1. Effective quantum yield of photosystem II (Yield II) of Klebsormidium crenulatum during desiccation (desiccated over 100 g of silica gel) monitored by PAM 2500.

Values represent means (n = 3), error bars show standard deviation (SD). The results of three filters containing similar amount of algal biomass are shown individually, to demonstrate that the decrease of Y II occurred within a short time frame (40–50 min). The relative air humidity (RH) inside the chamber (right y-axis) was monitored by a PCE sensor.