Fig. 7.

Change in selected strategy parameters over generations, including the proportion of biomass allocated to shoot before a wet crack is encountered, p_shbmb, in the first Crack Scenario run (A, quantile ranges shown to illustrate variability within a single population at given generations; and B, only means shown to allow clear comparison of four different evolutionary runs; CR1, first Crack Scenario run; CR2, second Crack Scenario run; BM1, first Biomass Scenario run; BM2, second Biomass Scenario run), the proportion of biomass allocated to shoot after a wet crack is encountered p_shbma (C), the initial growth weighting of the lateral roots wt₀ (D), the rate at which growth weighting of the laterals changes with depth wt_Δ (E), the inflection point for probability of branching moving down the main root b_down (F), the maximum probability of branching moving up the main root following its first encounter with the impermeable surface p_upmax (G) and the inflection point for probability of branching moving up the main root following its first encounter with the impermeable surface b_up (H), for all four evolutionary runs (key in B also applies to C–H).