ZOO 4400/5400 Population Ecology

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Interspecific competiton -- paired logistic equations
stable coexistence case

Embedded QuickTime Movie
Click on the image below to start the "movie".  A control bar will appear below the graph; the various buttons will allow you to stop and start it.

Note the straight trajectory -- the point moves directly toward the stable equilibrium point.  Note also, that the rate of movement is not constant (we are dealing with the logistic; its rate changes as a function of population size).

Parameters for this animation:  r1 = r2 = 0.5, K1K2 = 1,000, g12g21 = 0.67.
Go to animation of unstable case
Go to animation of stable case with curved trajectory