coevolution lattice

Dispersal

Each species mixes with its four neighbours at rate m.

Species 1

Species 2

Species 3

Coevolution

Tracking runs 1 → 2 → 3 → 1, so no species can win. Each pair sets its pull and its push separately; a negative push makes that pair converge instead.

Preset

1 tracks 2

2 flees 1

3 tracks 1

1 flees 3

2 tracks 3

3 flees 2

Update

Selection & drift

Stabilising, γ

Drift, σ

Let N_e fall toward the range margin

σ = √(G/N_e) in trait units, at the range core; the scale runs to 25, about the size of the strongest coevolutionary step. With N_e falling, the margin runs 7× that.

Lattice

View

Off-scale traits

Grid

Below 1 the lattice holds still on some frames, which is how you slow it past the frame rate.

Generations / frame