1. WORLD CLOCK
Bell Ringer
You have 5 – 10 Minutes
Stop Watch

2. Click the PIC Population video
POPULATION DYNAMICS
10 Minutes
Stop Watch
Click on image to access video. Have students reflect on what the video suggested.
Why is the population changing so drastically?
What factors are affecting the change?
Will the population continue to grow indefinitely?
Click the PIC Population video

3. LEVELS OF ORGANIZATION
biosphere
one individual living thing
all organisms of the same kind living in one area
group of organs working together
all interacting populations in an ecosystem
large region with typical plants and animals that includes several ecosystems
all living and nonliving things interacting within a certain area
group of similar cells organized to work together
group of different kinds of tissues working together
smallest unit of living things
ecosystem
community
population
organism
organ system
Ask questions as go through each level to engage students’ responses. Population dynamics begins with organisms and ends with ecosystems.
organ
Population Dynamics
tissue
cell

4. - Population Dynamics =
Studying how populations change in size due to birth rate/immigration and death rate/emigration and limiting factors ( abiotic and biotic)
Birth Rate:
(number of birth per 1000)
How does birth rate affects population size?
Death Rate
( number of death per 1000)
How does death rate affects population size?
Immigration:
( movement into an area)
How does immigration affects population size?
Emigration:
(movement out of an area)
How does emigration affects population size?
Add questions: How does each factor affect population size?
Change in
Population =
Birth Rate +
Immigration -
Death Rate
Emigration

5. Exponential Growth
Exponential growth occurs when the individuals in a population reproduce at a constant rate.
Under ideal conditions with unlimited resources, a population will grow exponentially.

6. Logistic Growth
As resources become less available, the growth of a population slows down or stops.
Logistic growth occurs when a population’s growth slows or stops after a period of exponential growth.

7. Logistic or Exponential Growth Curve?
Which graph is indicative of natural growth within a population?
Can you think of an example of exponential growth? Logistic growth?

8. Boom then stable Boom and Bust
Apply the graphs shown to real-world examples. Where do you see exponential growth in the world? (e.g., bacterial growth with unlimited resources, insects that reproduce rapidly in controlled conditions, laboratory conditions) Where might you see logistic growth?

9. Logistic Growth w/ Carrying Capacity
Can you think of some resources that could limit population growth? Characterize these resources as abiotic or biotic?
Population size (N)
Time (t)
Carrying capacity (K)
Limiting Resources
Exponential
growth
Carrying capacity is the largest number of individuals a given environment can support.
Every part of the graph has a meaning. Help students understand each aspect of the graph by asking what each part means.

10. Exponential and Logistic Population Growth: J-Curves and S-Curves
As a population levels off, it often fluctuates slightly above and below the carrying capacity.
Help students understand that the overshoot may be the highest point, but it does not represent the carrying capacity. The overshoot is natural, especially when you have exponential growth.

11. Limits to Growth
Limiting factor: a factor that causes population growth to decrease.
Density-dependent factors are limiting factors that depend on population size. (usually due to biotic)
Competition
Intraspecific
interspecific
Predation
Parasitism
Disease
Food
Shelter
Water
Space

12. Predator – Prey Relationship
Darwin Lied

13. Density-Independent Limiting Factors
Affect a population no matter what its size is (usually abiotic)
Unusual weather
Drought
Floods
Natural disasters
Seasonal cycles
Certain human activities
Damming rivers
Clear-cutting forests
Forest Fires

14. Wolf and Moose Populations on Isle Royale
Harsh Winter 60
2400
Parvovirus arrives 50
2000 40
400
1600 30
1200 20
800 10
Harsh Winters
400
1955
1960
1965
1970
1975
1980
1985
1990
1995
Moose
Wolves

15. Human Population Growth
Until about 500 years ago, the world’s human population remained fairly stable.
Then, as advances in medicine, agriculture, and technology occurred, the human population began growing very rapidly.
Today the world’s Today, the human population is greater than billion people, and it continues to grow, but at a slower rate.
Industrial
Revolution
begins
Agriculture
begins
Bubonic
plague
Plowing
and
irrigation

16. Age Structure
In part, population growth depends on how many people of different ages make up a given population.
Age-structure diagrams show the population of a country broken down by gender and age group.
Birth rates, death rates, and the age structure of a population help predict why some countries have high growth rates while other countries grow more slowly.

17. U.S. Population
Rwandan Population
Males
Females
Males
Females

18. Accountability Talk Stop Watch
Question 4: Biotic factors affect a population in many ways! Pretend you are a deer in the everglades. Would you want the humans to kill all the alligators in the everglades so humans could live a worry free life near the everglades?
You have 5 min to respond to your question
Then rotate
You have 1 min to read
You have 5 min to respond
Repeat until the same person gets their paper back (3 more rotations)
Do you agree with your original statement?
Stop Watch

19. Exit Slip
5 MIN
Stop Watch

20. Home Learning