1. EQ: How is population size affected by limiting factors?
Population Dynamics
EQ: How is population size affected by limiting factors?
****Add predation, mutualism, paratism, commensulism

2. Population Dynamics
KEY CONCEPT #1 Each population has a density and a dispersion strategy.

3. Population Density
Population Density: the number of individuals that live in a defined area

4. Population Dispersion
Population dispersion: How individuals in a population are spaced
Clumped
Random
Uniform

5. Population Dispersion
Draw an example of each type in your notes
Clumped
dispersion
Uniform
Random

6. KEY CONCEPT #2 Populations grow in predictable patterns.
Population Dynamics
KEY CONCEPT #2 Populations grow in predictable patterns.

7. Population Dynamics The size of a population is always changing.
Four factors affect the size of a population
Births
Deaths
Immigration
emigration

8. Population Growth: Birth and Death
Deaths- the number of individuals that die OUT of a population
Birth- the number of individuals born INTO a population

9. Population growth: Immigration and Emigration-
Emigration- the movement of individuals OUT of a population
Emigration Exits
Immigration-the movement of individuals INTO a population
Immigration goes In E E I I

10. Population Growth: Stop and Think
What do you think might cause rapid growth?
Abundance of resources
Teacher asks: What do you think might cause the rapid population growth? Answer: abundance of resources

11. Ecological factors limit population growth
A limiting factor is something that keeps the size of a population down.

12. Density-Dependent Limiting Factors
Factors are affected by the number of individuals in a given area.
DEPENDS on the population size
These are biotic or living factors

13. Density-dependent factors
Competition: members of a population compete with one another for resources (food & shelter)
Predation: the population of a predator can be limited by available prey (prey can be limited being caught)
Parasitism and disease: can spread more quickly through dense populations eventually causing a decrease

14. Density Independent Limiting Factors
Factors limit a population’s growth regardless of the density.
INDEPENDENT of population size
These are Abiotic or nonliving factors
unusual weather
natural disasters
human activities

15. Carrying Capacity
Carrying capacity: is the maximum number of individuals in a population that the environment can support.
Occurs when the births/immigration are relatively equal to deaths/emigration
A population crash is a dramatic decline in the size of a population over a short period of time.
When a carrying capacity suddenly changes

16. Djibouti Activity C- level 2 voice with your table
H- ask three before me
A- Complete the Djibouti Activity and analysis questions
Paste on left side of your notebook
M- remain seated (butt on stool, stool on ground)
P- work with your table group to complete lab
SUCCESS
Use bigger graph paper- easier to see the rice in each box

17. Exit Ticket
Which of the following is a limiting factor in a population of organisms.
A. reproductive replacement
B. life spans of the members
C. fluctuations in atmospheric temperature
D. availability of food
D. availability of food The availability of food is a limiting factor in a population of organisms. If there is not enough food, some of the organisms will die and the population will decrease in number

18. Exit Ticket
How does the predator-prey relationship affect a population?
A. The predators and prey are in competition with each other.
B. Usually either the predator or the prey will become extinct.
C. The predator species usually has exponential growth.
D. The relationship controls the population size of both species. D.

19. Exit Ticket
When an environment has reached its carrying capacity for a certain population, which of the following is true? 
A. Growth and immigration rate is equal to death and emigration rate.
B. Growth and immigration rate is greater than death and emigration rate.
C. Growth and immigration rate is less than death and emigration rate.
D. Growth rate is exponential.
A. Growth and immigration rate is equal to death and emigration rate. Carrying capacity is the maximum population size of a species that can exist in a given environment given the resources.

20. Exit Ticket
The pH of the water in several lakes in Norway and Sweden had decreased to below 5.0 due to an increase in acid rain. Which of the following is most likely to happen in these lakes?
A. the decline of several fish populations.
B. an increase in numbers of fish
C. an increase in the amount of primary producers
D. increased predator-prey relationships A.