Fv/Fm and ΦPSII were measured at three time points over a simulated winter recovery period (192 hours) to assess recovery of photosynthetic efficiency from desiccation. At T0.5, desiccated samples from all three field treatment groups had very low Fv/Fm values (mean UV-filtered = 0.044, σ = 0.036; mean UV-transmitted = 0.049, σ = 0.045; and mean site reference = 0.108, σ = 0.122). There was no statistical difference in Fv/Fm between any groups at T0.5 (Fig. 3). After 24 hours in simulated winter recovery conditions, Fv/Fm had increased in all samples. At T24, Fv/Fm of samples from UV-transmitting windows were significantly higher than those from UV-filtering windows (mean UV-filtered = 0.532, σ = 0.091; mean UV-transmitted = 0.599, σ = 0.054). Site reference samples had significantly higher Fv/Fm values (mean = 0.631, σ = 0.045) than UV-transmitted samples. At T192, Fv/Fm values of all treatments were also significantly different from each other in the same rank order: UV-transmitted were higher than UV-filtered, and site reference samples were higher than UV-transmitted; (mean UV-filtered = 0.790, σ = 0.023; mean UV-transmitted = 0.812, σ = 0.015; and mean site reference = 0.839, σ = 0.021). All treatment groups had relatively constant Fo (relative to Fm) over the simulated winter recovery period while Fm increased from near 100 to at least 700 bits (Fig. S2A).