1. Please pass back the new objective sheet. Please get out your signed permission slip and $15 for pick up. Take your “Tradeoffs- Sage Grouse and energy” reading packet and answers to the back lab table. Staple them together and put them in the white bin. Only 6 more days to get that permission slip turned in!

2. What do you think of this?

3. WHAT ARE THE RULES? THEY DON’T APPLY TO US, DO THEY? Population Ecology

4. Rule #1: Populations will grow exponentially according to their biotic potential

5. Linear growth vs. exponential growth

7. Biotic potential – capacity for growth Age at reproductive maturity Generation time Time between reproductive events Offspring per reproductive event

8. Rule #2: Populations cannot increase indefinitely

9. Sigmoidal growth – the S curve

11. Carrying capacity The number of individuals of each species that can survive in an area indefinitely.

12. Subtle details! At carrying capacity (K), individuals are still dying and being born. The total population size is constant. Populations do not know when they’ve reached K Populations cycle above and below K several times before leveling out.

13. Limiting factors set the carrying capacity

14. Two categories of limiting factors 1. density-independent limiting factors Natural disasters Clear cutting

15. 2. Density-dependent limiting factors  Food  Mates  Space  Disease  predators

16. Rule#3: There is more than one strategy for getting your genes into the next generation

17. Reproductive similarities?

19. Opportunists vs. Competitors

20. Survivorship curves

21. Rule #4: Predator and prey develop a predictable pattern.

26. Lotka-Volterra model

27. Soooo... Good thing we’re human and these rules don’t apply to us... Right?

28. Or do they? What part(s) of the sigmoidal curve do you see? Name two density- dependent and two density-independent factors that apply to humans. Are we r- or K- strategists? Defend your answer. How do humans avoid the Lotka-Volterra model?