Figure 3.

Fitted temperature–response model for video observations of flight activity, indicating estimated pollen beetle flight threshold values FT₁₀ (10.9 °C, 95% CL 9.9, 11.5), FT₂₅ (12.0 °C, 95% CL 11.4, 12.6) and FT₅₀ (13.2 °C, 95% CL 12.7, 14.2). Both axes and all FT estimates are back-transformed from the log₁₀ scale to the natural scale. Wing opening is taken to be indicative of a propensity to fly. Filled circles represent the observed data for each of the N = 486 pollen beetles that escaped the release point, plotted against the cage temperature recorded at the moment of escape. For each beetle, the observed data are of binary form, representing the wing status (open or closed).