1. Populations How they grow and what affects them

2. Characteristics of a Population Population Density ◦ How many organisms in a specific area Geographic Distribution ◦ Where is the population located Growth Rate ◦ How much is the population changing

3. Growth Rate Factors that affect the Growth Rate ◦ # of births ◦ # of deaths ◦ Individuals leaving or entering the population  Immigration: Entering IN to a population  Emigration: EXITING a population

4. Types of Growth Exponential ◦ J Curve ◦ Reproduction happens at a constant rate ◦ Happens under ideal conditions with unlimited resources

6. Types of Growth Logistical ◦ S Curve ◦ Population continues to grow but at a slower rate ◦ Happens when resources become scarce

8. What did you say? Carrying Capacity ◦ This is the number of individuals a given environment can sustain for a specific population Carrying Capacity!

9. Limiting Factors What limits the growth of a population? ◦ Density Dependent: Only become limiting when the population reaches a certain level of density ◦ Density Independent: Affect all of the populations in the same way.

10. Density Dependent Competition Predation Disease Parasites

12. Density Independent Weather Natural disasters Human Factors ◦ Damming Rivers ◦ Deforestation ◦ Controlled Burns

13. Human Population Growth

16. World Population Video