The fraction of simulations in Model 2 leading to different local optima. Results based on 100 simulations in which initial levels of n, y, and z are each set to a random number between zero and one, inclusive. These simulations produced one of three equilibria: n* = 0, 0 <n* < 1 or n* = 1. Caption a effect of the cost of cooperator dispersal (c) with P = Q = 0.3, s = 0.5, k = 2, e = 0.2; caption b effect of effective group size (k) with P = Q = 0.2, s = 0.6, e = 0.2, c = 0.3.
Hochberg et al. BMC Evolutionary Biology 2008 8:238 doi:10.1186/1471-2148-8-238