Optimal chemotaxis performance ( CP ) and β for different chemotaxis strategies. A. CP for low β adaptive (purple), high β adaptive (magenta), optimised adaptive (red), optimised inverted adaptive (orange), optimised linear (blue), and optimised hybrid (green) responses for increasing total sensitivity (λ or λ
). Performance is measured by attractant concentration A averaged over a finite length of time (τ = 1000) calculated with d = 0.001, normalised by maximum attractant concentration A
. Hybrid performance at low (high) sensitivity matches that of a linear (adaptive) response. At intermediate sensitivities a hybrid response out-performs both linear and adaptive responses. B. Optimal β value for achieving highest chemotactic performance for adaptive (red) and linear (blue) responses at different levels of sensitivity. The shaded region indicates where the chemotactic performance was within 1% of the maximum for a given β value. Performance is measured as in panel A.