Figure 3.

The distance at which the germinability of dispersing spores is expected to drop by 50% due to exposure to sunlight, as a function of average wind speed. Panels (A; 5 Wm⁻² and B; 320 Wm⁻²) correspond to typical minimum and maximum amounts of daily radiation (i.e., cloudy vs. sunny days) for the species examined, as measured in Finland over April–October in open areas (Anonymous 1993). Solid lines: thick-walled spores; dashed lines: thin-walled spores. The four lines correspond to the different spectral weighing functions W1–W4 (from highest to lowest line) described in Estimating the effect of light-induced reduction in germinability on dispersal distances.