Nutria Population

What does this Model Represent?

This model represents the population of nutria (a type of aquatic rodent) over time. Although large populations would be exceedingly complex to model solely with agent models, they can often be effectively approximated with systems models. In essence, for any given time step a certain fraction of the population reproduces, and a certain fraction dies.

What are the elements of this Model?

The only group in this model is the nutria population. During each time step, nutrias are born and die according to the set parameters. The results are then displayed on the graph.

How do I use this Model?

Simply set the birth fraction and competition factors, and then run the model. The number of nutrias at each time will be displayed on a graph.

What should I expect?

In the absence of a competition factor, the nutria population will grow exponentially to infinity. Adding a competition factor causes the population to level off at a certain equilibrium point.

Download the model file.