BIO150Y: Saving the Whooping Crane
You are now a manager! Experiment with different combinations of management options to boost population growth and reduce the long-term extinction risk for Whooping Cranes. The best strategy will give the largest reduction in pE compared to the baseline, at the lowest cost.
- With management, can you reduce pE below baseline estimates?
- What is the most cost-effective management strategy?
- Which options have the greatest impact? Those that affect birth rate, death rate, or carrying capacity?
- Choose your management options from the pulldown menus. The population parameters (r and K) and the total cost will be automatically adjusted. Your budget is $50 million and you cannot exceed this.
- Select Run simulation to open up the simulation applet and then run your simulations.
- Conduct replicates.
- Use the data tables in your lab manual to record your results. You can download a print-ready version of the worksheet as a PDF file (19 Kb).
- Based on your results, answer the quiz questions below.
- Baseline comparison: Transfer the average pE you obtained from your baseline simulations to the first row of your data table.
- Be methodical: Start by just adjusting factors influencing carrying capacity, K. Then birth rate and death rate separately. Finally, start to use a combined strategy.
- Actual counts: This gives you the actual population growth, so you can see how you did!
Questions Based on your results, answer these questions.
What type of management option is most cost-effective for the 1941 Whooping Crane population?
How many cranes were there after 60 years of management?
© 2005 University of Toronto. All rights reserved.