Regular oscillations exist between prey and predator populations.
As the prey population starts growing exponentially, the predator
population grows so fast that the number of prey is reduced again.
With less to eat, the predator population declines again.
Variables:E = Unlimited energy source
J = Renewable energy source (Kilocal. per m2/Summer)
H = Herbivores
C = Carnivores
P = Storage of grasses
K6 = Depreciation of the prey
Equations:DP = K0*J - K*P*H
DH = K1*P*H ( - K6*H ) - K4*H*C
DC = K5*H*C - K8*C
Simulation:The graph shows the changes of H (red), C (blue) and P(green) over a time period.
Source code: Oscillat.java
"What if" Experiments: