1. Populations

2. Inquiry Activity

3. Inquiry Activity

4. Inquiry Activity

5. What is a Population?
Group of the same species in an area

6. Characteristics of Populations
Geographic distribution
Density
Growth rate
Age structure

7. Geographic distribution
An area that is inhabited by a population
Can vary in size

8. Density Population density – number of individuals per unit area
Depends on the species and its ecosystem

9. Growth Rate 3 Factors Affect Population Size: Number of births
Number of deaths
Number of individuals that enter/leave the population
Emigration – individuals Exiting the population
Immigration – individuals coming Into the population

10. Growth Rate Exponential Growth Logistic Growth
Occurs under ideal conditions
Logistic Growth
Occurs when a population’s growth slows/stops

11. Growth Rate
Carrying capacity – maximum number of individuals that an environment can support

12. Limits to Growth
Limiting factor – something that causes a population’s growth to slow down or stop
2 Types
Density dependent
Density independent

13. Limits to Growth Density Dependent Density Independent Competition
Predation
Parasitism/ disease
Density Independent
Climate extremes/natural disasters
Ex: drought
Human disturbances

14. Age Structure
Population growth depends on how many people of different ages make up a population