1. HOW POPULATIONS GROW
Chapter
5-1

2. I. Characteristics of Populations
A. Geographic Distribution
B. Density
C. Growth rate
D. Age structure
=Area inhabited by a population
=The # of individuals per unit area
=Rate at which a population changes size
=Different ages of the organisms in a population

3. II. Population Density
The number of individuals per unit area

4. A. Cactus: low #’s Low density B. Shrubs: higher #’s High density
II. Population Density
Example:
A. Cactus: low #’s
Low density
B. Shrubs: higher #’s
High density

5. Turn to your shoulder partner and rally robin as many things as you can that affect population size.

6. III. Population Growth Factors that affect population size:
A. Birth Rate
B. Death Rate
C. Immigration
D. Emigration
=the amount of births
=the amount of deaths
=moving into an area
=moving out of an area

7. LT: What affects population growth
LT: What affects population growth? SC: Students will understand how different factors affect population growth

8. What do these lines indicate a population is doing?B C

9. IV. How is the Population Affected? Increase or Decrease
A.  birth rate &  death rate
B.  birth rate &  death rate
C.  immigrants &  emigrants
D.  immigrants &  emigrants
=Decrease
=Increase

10. What kind of growth do you think the human population is currently experiencing?
What do you think it looks like on a graph?
Human Population growth

12. V. Exponential Growth B. Produces a J – shaped Curve when graphed
A. Will occur under IDEAL conditions like:
1. unlimited resources
2. no predators
3. no disease
4. plenty of space
B. Produces a J – shaped Curve when graphed

14. Logistic Curve S-Curve

15. VI. Logistic Growth S- Curve
A. In ecosystems where:
1. Resources are limited
2. Predators exist
3. Disease exists
4. Lack of space
B. Occurs when the carrying capacity of an ecosystem has been reached.

16. C. Carrying capacity= when a population’s growth slows or stops
C. Carrying capacity= when a population’s growth slows or stops. (not increasing or decreasing, leveled off)
D. This occurs when:
1. Birth rate = death rate
2. Immigration = emigration

17. 1. Carrying Capacity
The largest number of organisms that a given ecosystem can support

18. Crash Course
The Science of Overpopulation - YouTube