Fig. 6.

Feeding in a dynamic environment depends on the timescale of change. (A) Pumping response to periodic low-to-high food steps with a fast and slow period compared with the committed and pause lengths (${\tau }_b={\tau }_p=50$) and instantaneous food level $x_t$ (red and blue, respectively). (B) Fraction of food gained per bite (normalized to the theoretical maximum). (C) Periodogram showing the average pumping rate in response to periodic steps from 13 to 17, 10 to 20, and 0 to 30 ($T=15$). The location of the trajectories shown in A is indicated as blue and red arrows (top and bottom of A, respectively). The committed and pause durations for all panels are ${\tau }_b={\tau }_p=50$.