1. Population Density
May 2017
Notebook Page 12

2. Warm Up May 12, 2017
What are organisms of the same species living together called?
What is the equation for density?
What does density actually measure (explain the two parts of the equation).
3) If an ecosystem could support 100,000 producers how many primary consumers, secondary consumers, and tertiary consumers could it support? Think of the 10% rule.
Objectives: TSWU density as it pertains to population within an area.
Essential Question: How is density of a group of organisms affected population and area?

3. Population Density = # of organisms/area
Warm Up May 15, 2017
Density = Mass/Volume
Population Density = # of organisms/area
Area = Length x Width
Suppose you have a classroom that has a length of 10 meters and a width of 20 meters. If there were 30 student in the class, what would be the population density of the room.
What is the difference between a population and a community?

4. Population*
- A group of organisms belonging to the same species that live in a particular area. Populations can be described based on their size, density, or distribution.

5. Hierarchy of Organisms*
- Organisms of the same species live together forming populations, different populations interact to form communities, and those communities live in an ecosystem.
- All of these ecosystems together make up the biosphere.

6. Population Density*
- Measurement of the number of individual organisms living in a defined space.

7. Population Density Activity - 1
1. Choose 10 States
2. Place them in order from highest population density to lowest population density.
3. Create a key and color code your states. Darker colors should represent higher population densities and lighter colors should represent lower population densities.
3. Your map key should include the state, color, and population densities for all ten states.
4. All information should be placed on the back of your map.

8. Population Density*
- Measurement of the number of individual organisms living in a defined space.

13. Population Density Activity - 2
Prairie Dog activity
Density of Mr. Black’s room
Length = 11.5 meters
Width = 8.4 meters
Density of Mr.
Corrado’s room
Length = 7.5 meters
Width = 10.1 meters

14. Population Density Extension
Density of the data closet across the hall.
Length = 4.18 meters
Width = 2.62 meters
Your choice for the fourth box.

15. Limiting Factor
A factor that prevents the continuous growth of a population in an ecosystem.
Limiting factors can be living- biotic
Or nonliving- abiotic
Discussion Point: Describe 2 limiting factors that may prevent the growth of a population in an ecosystem.

16. Density Dependent* A limiting factor that depends on population size.
Examples (mostly biotic)
   competition
   predation
   parasitism
  disease

17. Density Independent*
Affect all populations in similar ways, regardless of the population size.
Examples (mostly abiotic)
   unusual weather
   natural disasters
   seasonal cycles
   certain human activities - deforestation

18. Discussion Points What is a limiting factor
Name 2 density dependent limiting factors.
What is the difference between a density dependent limiting factor and a density independent limiting factor?

19. Population Spacing in an Ecosystem
Three types of population spacing.
Uniform, random, and clumped
Why would organisms be clumped together in an ecosystem? In uniform? Random?

20. Population Spacing – Clumped
Organisms that clump together in an ecosystem tend to gather around resources.
They also clump together for
social interaction.

21. Population Spacing – Uniform
Organisms that live in uniform in an ecosystem tend to space themselves out to reduce competition.

22. Population Spacing – Random
Organisms that live randomly in an ecosystem grow without regard to other organisms.