Fig. 4. Comparison of the actual distribution of individuals of CB4856 on a thermal gradient at different time points (filled bars), with the null temperature-dependent-only diffusion prediction from the diffusion simulation (open bars). Individuals starting at 24°C clearly move towards the colder region of the thermal gradient at a much quicker rate than would be expected under the null model. Sample sizes for the empirical distributions: 15 min, N=495; 30 min, N=556; 60 min, N=1077; 8 h, N=886.