PHYSICAClass 12 Botany simulations · Organisms and Populations
Predator–prey cycles
Prey multiply; predators eat them and multiply in turn; prey fall, predators starve — and the cycle repeats.
What to notice
Predators keep prey populations under control; predator peaks lag behind prey peaks.
Key relation
dH/dt = aH − bHP ; dP/dt = cbHP − dP (Lotka–Volterra)
Try this
Increase the predation rate. What happens to the size of the swings?
What you can change
- Prey birth rate: 0.2 to 1.2
- Predation rate: 0.005 to 0.05
- Predator death rate: 0.1 to 1
- Time: 0 to 60
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