Evolution of intensity of cooperative foraging predicted by (a) evolutionary isoclines and illustrated by (b) simulated evolutionary trees: the initially monomorphic community undergoes several branching events and becomes highly polymorphic.

<p>(a) Shaded areas represent regions of possible coexistence between strategies and . The direction of evolution is indicated by arrows. Stable (resp. unstable) isoclines are represented by thick (resp. dashed) lines. (b) The blue tree (left) represents the relative number of colonies using the corresponding strategy (the darker the blue, the more common the strategy), and the red tree (right) represents the associated colony’s size (the darker the red, the more workers present in the colony). Simulations start using individual foraging as the ancestral strategy (). Parameter values: , , . (See Fig. 3 for simulation details).