1. Populations and Growth

2. Population Dispersion

3. Survivorship Curves Type I Few offspring Low infant mortality
Parental care of young
Most survive until old age
Large mammals, including humans

4. Survivorship Curves Type II
Equal chance of living or dying throughout the lifetime
Birds, reptiles, small mammals

5. Survivorship Curves Type III High infant mortality rate Many offspring
No parental care
Invertebrates, fish, amphibians, and plants

6. Changes in Population Size
Growth factors
Immigration: individuals moving into a population
Births
Shrinking factors
Emigration: individuals moving out of a population
Deaths

7. Exponential Growth Early phase of growth
High availability of resources
Little competition
Little predation

8. Logistic Growth Limits on growth appear Competition for resources
Predation
Parasitism
Illness

9. Human Population Growth
Are humans in exponential or logistic growth?

10. U.S. Population Density - 2000
People per square mile
0-1 (white) (green) (blue)
1-4 (yellow) (teal) ,995 (dark blue)
5-9 (yellow-green) (dark teal)