Download Population Growth

POPULATION
GROWTH
Key Vocabulary:
-Population Growth
-Exponential Growth
-J Curve
-S Curve
-Population
-Carrying capacity
-Limiting Factor
11/30/15
LEQ: How do population sizes
change over time?
Objective: Identify and explain the
two types of population growth.
FINAL EXAM
By the end of today’s lesson you will
be able to….
The graph to the right represents population
growth in a specific population. What is
happening at point E?
A. The death rate of
the population has
increased.
B. The population has
reached its
carrying capacity.
C. The population is
growing
exponentially.
D. The population has
stopped growing.
DRAW THE GRAPHS BELOW:
1. In 1 complete sentence, describe what is happening in graph A.
2. In 1 complete sentence, describe what is happening in graph B.
3. Choose one of the graphs to label “S-curve”. Explain why you chose
this graph.
4. Choose on of the graphs to label “J-curve”. Explain why you chose this
graph.
WHAT IS A
POPULATION?
A population is the
number of organisms
of the same species
living in an area.
• Exponential growth =
the J curve
• Grows at a fast
WHAT ARE THE
increasing rate with
TYPES OF
NO
limiting
factors
POPULATION
GROWTH?
• Logistic Growth = S Curve
• Levels off due to limiting
factors
WHAT ARE • Reaches carrying capacity
THE TYPES OF (largest # of organisms the
ecosystem
can
support)
POPULATION
GROWTH?
CLASSROOM VS. THE
WORLD
What limited our classroom?
What would limit the human
population from growing TOO
big?
Limiting factors are factors that
prevent a population from
growing infinitely (forever!)
WHAT IS A Examples:
LIMITING 1.
2.
FACTOR? 3.
4.
5.
1. Resources
Food
Water
2. Space
3. Predation
4. Disease
Bark Beetle
5.Shelter/Habitat
?
NOPE!
Not the right
Habitat (Home)
PARTNER PRACTICE
1. Identify the trend/pattern you
see in the graph to the right.
2. What limiting factor affected
the carrying capacity of the
island for Darwin’s finches?
3. What was the approximate
initial carrying capacity
before the drought? Was the
carrying capacity of the
island after the drought?
PARTNER PRACTICE
1. What was the limiting factor
for the gypsy moth?
2. What happened when the
population of caterpillars
exceeded the carrying
capacity of the
environment?
3. Look at the population of
gypsy moths on St. Paul
Island before 1938. Was the
caterpillar population
growth primarily
exponential or logistic? J
curved or S curved?
4. Based on the graph,
which island had a larger
infestation of the gypsy
moth - St. Paul or St.
George island?
5. St. Paul island is larger
than St. George island.
What explains the
difference in the size of
the gypsy moth infestation
between the islands? Be
sure to discuss the limiting
factor involved.
Create a T-Chart like the one
below. Classify the following
terms with the correct type of
growth:
Word Bank: S-curve, J-curve, has limiting factors, no limiting
factors, no carrying capacity, reaches carrying capacity, grows
indefinitely, levels off, describes human population growth
Logistic
Growth
Exponential
Growth
A population is the number of organisms of the same
species living in an area.
Exponential growth grows at a fast increasing rate with
NO limiting factors
Logistic Growth levels off due to limiting factors and
reaches carrying capacity
Limiting factors are factors that prevent a population
from growing infinitely (forever!)
FINAL EXAM
By the end of today’s lesson you will
be able to….
The graph to the right
represents population
growth in a specific
population. What is
happening at point E?
A. The death rate of the
population has increased.
B. The population has
reached its carrying
capacity.
C. The population is growing
exponentially.
D. The population has
stopped growing.
FINAL EXAM
By the end of today’s lesson you will
be able to….
The graph to the right represents population
growth in a specific population. What is
happening at point E?
A. The death rate of the population has increased.
B. The population has reached its carrying
capacity.
C. The population is growing exponentially.
D. The population has stopped growing.