1. Changing of the Population

2. Learning Objectives
Identify factors that affect population size

3. Population Density
Population density - the number of individuals per unit area.

4. Factors That Affect Population Size
Births Deaths Immigration Emigration

5. Birth
Births increase the number of individuals in a population

6. Death
The size of a population decreases when individuals die

7. Immigration
Immigration - the movement of individuals into a population from another place.

8. Emigration
Emigration - the movement of individuals out of a population and into another population.

9. Carrying Capacity
Carrying capacity - the maximum # of individuals of a given species that an area's resources can sustain indefinitely.

10. Factors That Affect Carrying Capacity
2. Sustainable food supply
1. Abundance of food
3. Competition for food

11. YouTube World Population

12. Stop Here

13. Changing of the Population
Ecology - Part 9
Changing of the Population

14. Limiting Factor