1. 1 Mon. Tues. Wed. Thurs. Fri. Week of Oct. 27 Independent project set-up Week of Nov. 3 Forest ecology lab – dress for weather Exam 2 no OH Week of Nov. 10 Independent project analysis Week of Nov. 17 River ecology lab – dress for weather Lab Exam no OH

2. 2 For exam: - Chaps. 6,7,8,13 - Chap. 14 – only equations and concepts we talked about in class - Chapter 15 – only through p. 302.

3. 3 Outline Introduction How are populations defined and measured? How do populations grow? How does population size change through time and space?

4. 4 Figure 15.5 What causes population size (N) to fluctuate?

5. 5 Properties that make algae more likely to fluctuate than sheep?

6. 6 Figure 15.6 Some populations show regular fluctuations between high and low - Periodic cycles

7. 7 What causes cycles?

8. 8 Time delays cause cycles especially in fast growing populations

9. 9 Populations have “momentum” – can be delays between changes in environment and response in terms of birth and death rate Population can overshoot K and then crash What causes delays?

10. 10 Figure 15.12 50100 150 0 Time(days) fecundity=density-dependent adult survival = less so

11. 11 Structure of course Environmental variability Organisms Ecosystems Populations Species interactions Communities Applied Ecological Issues