![]() New individuals reaching the island may colonise, but lack of space leads to faster extinction (turnover) rates as time goes on. Similar rules are applied to the continental population with a slight difference to allow for scaling. ![]() Those that do manage to colonise the island can begin to replicate and form a population using simple rules that remove individuals through crowding. If they do not reach the island their energy is exhausted and they die. Individuals that find themselves in the sea start “swimming” quickly in the direction they are facing. In each time step the individuals of the species move a random amount. This number is simply the number of clearly distinct colours that netlogo has. The model is intiated with 14 species on the continent. There will be stochastic fluctuations around the equilibrium number of species. The model shows that the “equilibium” is in fact dynamic. Try to find a way to maintain 14 speciesĪ demonstration of the logic behind MacArthur and Wilson’s equilibrium model of Island Biogeography. Design experiments with different configurations of islands. Otherwise you can down load the model from here.ĮTIBG2 A demonstration of MacArthur and Wilson’s Equilibrium Theory of Island BiogoegraphyĪdd some islands before running the model. You may also have to increase the speed slider in the browser version. You will need to press setup, and then make one or more islands. Click on the link below and then be patient while the model loads. If you have the latest Java plugin for your browser you can run the model without installing netlogo. This little netlogo model can be used to illustrate the concepts behind MacArthur and Wilson’s classic theory.
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