Fig. 2.

Predator search times. (A) Mean search time as a function of the ratio of the olfaction radius (r_o) to vision radius (r_v). Solid orange line (visual Lévy), dashed blue line (visual TDD), orange circles (visual-olfactory Lévy), and blue diamonds (visual-olfactory TDD) each represent mean search time of 1,000 replicate simulations. Confidence bands represent ± 2 SEM. The following parameters values were used: a = 1, r_v = l_m = 50a, τ_v = 1 s, τ_o = 30 s, mean intertarget distance was 1,000a, and λ_a = 100 units of scent per τ_o (see Model Development for description of parameters, also SI Text). (B) Empirical distribution of search times of visual Lévy (orange solid line, squares), visual TDD (blue dashed line, squares), visual-olfactory Lévy (orange solid line, circles), and visual-olfactory TDD (blue dashed line, circles) strategies. In the case of the visual-olfactory strategies, frequencies are shown for r_o/r_v = 4. Note the large number of searches resulting in long search times for visual predators.