Spatial snowdrift game in heterogeneous agent systems with co-evolutionary strategies and updating rules*
Xia Hai-Jiang, Li Ping-Ping, Ke Jian-Hong†, Lin Zhen-Quan
       
Snapshots of spatial patterns of A -type cooperators (blue), B -type cooperators (black), A -type defectors (red), and B -type defectors (yellow) for different cost-to-benefit ratios. (a) r = 0.12; (b) r = 0.18; (c) r = 0.23; (d) r = 0.45; (e) r = 0.62; and (f) r = 0.82. Here, the other model parameters are the same, ν T = 3 and f a 0 = 0.5. Obviously, almost all the B -type agents will take the D -strategy eventually and the concentration of A -type agents decreases with the increase of r .