1. Population Ecology Part 2
AP Biology
Population Ecology
Part 2

2. Expression of DNA to create traits

3. DNA Inherited

4. Century Plant

5. Exponential “Ideal” Growth

6. Elephant population 1900 1920 1940 1960 1980 Year
Exponential Growth
8,000
6,000
Elephant population
4,000
2,000
1900
1920
1940
1960
1980
Year

7. Hawaii millions of years ago

8. Pioneer species begin to colonize (lichens and mosses)

9. Then over time, grasses begin to grow.

10. Then over time, shrubs will appear and they will be followed by trees.

11. Hawaii today

12. Intrinsic Growth

13. Logistic Growth

14. Logistic “realistic” growth

15. Allee affect and the Extinction Vortex
Small
population
Genetic
drift
Inbreeding
Lower
reproduction
Higher
mortality
Loss of
genetic
variability
Reduction in
individual
fitness and
population
adaptability
Smaller
population