read pages 78 83 and answer questions below

1. Herons limit the number of frogs in a pond. Is this a bottom up or a top down control?

2. Herons limit the number of frogs in a pond. Is this a density dependent or density independent control?

3. Differentiate between the terms critical number and carrying capacity.

4. What is density dependence?

5. Explain the difference between r- and K- strategists. Where do these terms come from, and what are the characteristics of each broad category?

6. Describe the predator-prey relationship between the moos and wolves of Isle Royale. What other factors influence these two populations?