Defining the population control: foxes capture hares

Revision as of 04:11, 14 September 2007 by ReneeB (Talk | contribs)

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1. Drag two variable nodes in the diagram, type ‘Hare capture rate’ and ‘Hares captured’ for the title.

Foxes and Hares diagram 1.6.jpg

2. Create an arrow from ‘Hare capture rate’ to ‘Hares captured’, then from ‘Hares captured’ to ‘Hares at end’.

Foxes and Hares diagram 1.7.jpg

3. Double click on Hare capture rate to open its object window. Object window should appear.

4. In the Description field type ‘Percentage of hares captured by each fox during a time period. Press tab.

5. In the Definition field type ‘25%’, press alt+enter. Your object window should look like this.

Object hare capture.jpg

6. Select Hares captured. Click on the key icon. Select Description from the Attribute popup menu. Type ‘Number of hares captured during a time period’.

Foxes and Hares diagram 1.8.jpg

7. Draw arrows from both ‘Hares at end’ and ‘Foxes at end’ to ‘Hares captured’. Your diagram should look like this.

Foxes and Hares diagram 1.9.jpg

8. Select Hares captured. Click on the key icon. Select Definition from the Attribute popup menu, type Dynamic(75,Hare_capture_rate*Hares_at_end[Time-1]*Foxes_at_end[Time-1]). Press alt+enter.

Foxes and Hares diagram 10.jpg

9. Click on the result button. Result window should appear.

Result Hares captured.jpg

10. Close the Result window. Hares captured still selected open its attribute panel. In the Attribute popup menu select Definition. Type Dynamic(75,Min([Hares_at_start-20,Hare_capture_rate*Hares_at_end[Time-1]*Foxes_at_end[Time-1]-20]))

Foxes and Hares diagram 11.jpg

11. Press alt+enter to accept the changes.

12. Select Populations. Click on the Result button. Return to Diagram window.

Result Populations.jpg

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