Figure 5.

Robustness to cheaters. We calculated the maximum birth rate (b₀) that a cheater could have without driving a community of cross-feeder extinct. The larger this number is, the more robust the community is to cheaters. Each simulation was run with b₁ = b₂ = 0.6, δ = 0.15, Q = 6.5 and a community size of 200 × 200 sites.