geog124_hw1 - Geog 124 Homework 1 Experimenting with...

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Geog 124 Homework 1: Experimenting with NetLogo I would prefer that you use NetLogo for your first homework assignment. This is relevant to the discussion of predator-prey dynamics and the Lotka-Volterra equations. Please give it an honest try. If you find it too challenging or confusing, or if you experience technical problems that you cannot resolve, please contact me for an alternative assignment and a possible deadline extension. Introduction Download NetLogo from the website: Make sure that you download and install the version appropriate to your operating system, and that you have enough space on your computer for the application (as indicated on the download page). It is easy to uninstall once you are done with the assignment. Most of the Cartography Lab computers have NetLogo already installed. Start NetLogo. From the top menu, navigate to File > Models Library. In the resulting window, click on the Biology folder to open it, and then click on Wolf Sheep Predation, near the bottom of the list. Click the Open button beneath the resulting description. The initial window might look like this: Note the three tabs at the top: Interface, Information, and Procedures. Click the Information tab and read the information there. Pay particular attention to the descriptions of the variables in the “How To Use It” section. Then switch back with the Interface tab. With the Grass turned on (the grass? switch), this model provides three trophic levels. I would like you to experiment initially with two trophic levels: grass and sheep. To do this, the grass must be turned on, and the initial-number-wolves must be changed to zero (use your mouse to control the slider). Click Setup, and then click Go. Watch the graph, and once the simulation has run for about 3000 time steps, click Go again (this is how you stop a run manually). The resulting window should look something like this: 1
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You can grab an image of the graph alone by placing the cursor over it, right clicking, and selecting CopyImage. The Paste into a Word document: Note from the graph that the population fluctuations in the early stages of the simulation are different from the pattern it eventually settles into. These early dynamics are known as the ‘transient period’, with which we are not usually concerned. Note also that the graph is self-scaling along both axes. The maximum values on the graph will adjust to the data. Since the x-axis represents time, the graph will continue to
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geog124_hw1 - Geog 124 Homework 1 Experimenting with...

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