1. Chapter 5

2.  Determined by ◦ Births ◦ Deaths ◦ Migration

3.  Under ideal conditions populations grow exponentially.

4.  Under real conditions populations experience logistic growth.  Limiting factors cause a population to maintain a certain size = carrying capacity

5.  Both biotic and abiotic factors limit the growth of populations. ◦ Competition ◦ Predation ◦ Parasitism and disease ◦ Unusual weather ◦ Natural disasters ◦ Seasonal cycles ◦ Human activities

6. Growth of Aphids Exponential growth Steady population size Peak population size Rapid decline Steady population size Section 5-2 A Density-Dependent Limiting Factor Competition

8.  Still exponential.  Advances in agriculture, medicine, industry and sanitation have improved survival rates.

9. Agriculture begins Plowing and irrigation Bubonic plague Industrial Revolution begins Section 5-3 Human Population Growth

10.  Estimated to be 9 billion.  What will happen when we reach earth’s carrying capacity? ◦ War, famine, pandemics  http://www.peterrussell.com/Odds/WorldClo ck.php http://www.peterrussell.com/Odds/WorldClo ck.php