Host-Parasite Coevolution — Red Queen Hypothesis Simulator

🔄 Coevolution

Selection strength s: 0.4 Mutation rate μ: 0.001 Initial host freq p₀: 0.50 Initial parasite freq q₀: 0.20 Time steps: 500

Host (p)

Parasite (q)

Host freq p—

Parasite freq q—

Generation—

Host cycle ~—

Red Queen
dp/dt = p(1-p)(w_h - w̄_h), dq/dt = q(1-q)(w_p - w̄_p). Frequency-dependent selection: host fitness ↓ when parasite adapts → endless oscillation. "Running to stay in place."

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