1. Start-up for 5/5/14
Compare at least 2 differences between primary and secondary succession.
What is carrying capacity?
How is predation related to carrying capacity?

2. Biology Chapter 5 Populations Pages 119-127
Objectives: Students will
Define three important characteristics of a population.
Summarize how four factors affect a population’s size.
C) Compare exponential to logistic growth.
Define limiting factor.
Compare density dependent to density-independent limiting factors.

3. Population Density Growth Rate = number of individuals per unit area.
Define three important characteristics of a population.
Population Density
= number of individuals per unit area.
Which has the higher density and why?
Geographic Distribution
= area inhabited by a population.
Which has the larger geographic distribution?
Growth Rate
= increase or decrease in population size.

4. the population will grow
B) Summarize how four factors affect a population’s size.
The Four Factors:
1. Birth Rate =
2. Death Rate =
Number of individuals born
Number of individuals that die
If birth rate is greater than the death rate
the population will grow
What happened to the size of this population?
From
From 1930 to 1950
From 1900 to 2000
It birth rate is less than the death rate
the population will decrease

5. Why do you think the death rate peaked so badly in the 1770’s?
B) Summarize how four factors affect a population’s size.
Why do you think the death rate peaked so badly in the 1770’s?
Smallpox and other diseases
CBR = Birth Rate
CDR = Death Rate
Write at least a 3 sentence quick-write analyzing how the population of Sweden has changed from 1735 to 1995.

6. What happens to a population’s size from immigration?
B) Summarize how four factors affect a population’s size.
The Four Factors:
Movement Into a Population, introduction of a nonnative specie
3. Immigration =
4. Emigration =
Movement out of a Population, Exit
What happens to a population’s size from immigration?
What happens to a population’s size from emigration?

7. Exponential Growth Logistic Growth
C) Compare exponential to logistic growth.
Exponential Growth Logistic Growth
What does an exponent do to a number amount?
Resources become less available
Ideal conditions with unlimited resources
Population growth slows or stops
Populations grows drastically
S-shaped curve on carrying capacity
J-shaped curve on graph
On the following graph, circle and label the exponential and logistic growth.
What does this line represent?

8. Limiting Factor = Factor that causes population growth to decrease.
Define limiting factor.
Factor that causes population growth to decrease.
Limiting Factor =
List at least 4 factors that you believe will cause a population to decrease. Talk to your partner. 1. 2. 3. 4.

9. Density Dependent Limiting Factor =
Compare density dependent to density-independent limiting factors.
Density Dependent Limiting Factor =
Density Independent Limiting Factor =
Factor that becomes limiting only when the population is dense (crowded)
Limiting Factor that affects all of the populations no matter what their size.
Competition
Predation
Parasitism
Disease
Unusual weather
Natural Disasters
Seasonal Cycles
Human Activity – damming rivers or clearing forests

10. Understanding check
Why do population sizes in an ecosystem change? Write a summary answering this question. Your summary must include at least 4 sentences and 3 words from the Ecology Unit Word List