Stochastic Predator-Prey — Demographic Noise

Demographic stochasticity — the randomness inherent in birth/death events of finite populations — profoundly changes Lotka-Volterra dynamics. While the deterministic system has closed orbits, individual-based simulations show stochastic spiraling, extinction events, and quasi-cycles that can be understood via van Kampen's system-size expansion.

Prey (N)
Predators (P)
Deterministic

Parameters

Prey:
Pred:
Extinct: No