4: Population Dynamics...Population Dynamics Study of how populations of species change over time...
Transcript of 4: Population Dynamics...Population Dynamics Study of how populations of species change over time...
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4: Population DynamicsPopulation size, reproduction, limiting factors, energy flow
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Day 1: Warm Up: What is your favorite
type of dessert?
LT: I can explain and graph the
two types of population growth.
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Discussion Questions:What factors can cause an ecosystem to become unbalanced?
What factors can impact a population?
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“Oh Mouse” Game- Mouse and Owl
- Graph populations as you go
- Resources: water, food, shelter
- Limit different ones
- Discuss
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Post-Game Discussion- What were some things you noticed during this game?
- When the mouse population increased/decreased, what
happened to the owl population?
- When the owl population increased/decreased, what
happened to the mouse population?
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Population DynamicsStudy of how populations of species change over time
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Exponential Population Growth (J CURVE)- When resources are UNLIMITED,
population will increase
- J-shaped graph
- This type of growth is unrealistic for the
real world, because there are always
factors that impact population growth
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Example: deer in yellowstone. When wolves
were removed from the yellowstone area, the
predator of deer was removed, so their
population increased very quickly, which
drastically altered the ecosystem.
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Logistic Population Growth (S Curve)
- Population grows exponentially (quickly) at first
- As population gets larger, it approaches carrying
capacity
- Carrying capacity - the maximum number of
living organisms that an ecosystem can support
- Once a population reaches its carrying capacity,
the growth rate slows
- S shaped curve
- Much more realistic type of growth
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Example: Bears are very large and eat
ALOT. An ecosystem can only support a
certain number of bears, if the population
grows beyond that number (carrying
capacity), bears will begin to die or move
because there won’t be enough food for
them to survive.
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Discussion: What are factors that impact population growth and cause populations to reach carrying capacity
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Factors that impact population size:- Predator and Prey relationships
- Predator
- Prey
- Resources (water, food, shelter)
- Disease
- Reproductive Potential
- Human impact
- Habitat loss
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Day 2: Warm Up: What are the two types
of population growth? Draw a
graph of each type.
LT: I can explain how and why
populations reach carrying
capacity.
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Review: Types of population growth
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WHAT TYPE OF POPULATION GROWTH IS THIS? (Logistic
or exponential)
A couple of mice catch a ride in a tractor to a new meadow that is full of resources and no predators. They begin eating and reproducing very quickly.
A: Exponential
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WHAT TYPE OF POPULATION GROWTH IS THIS? (Logistic
or exponential)
A shark regularly hunts a large school of fish
A: Logistic
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WHAT TYPE OF POPULATION GROWTH IS THIS? (Logistic
or exponential)
A: Logistic
A mountain goat population lives in a remote area with limited resources.
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WHAT TYPE OF POPULATION GROWTH IS THIS? (Logistic
or exponential)
A: Exponential
A mountain lion population is hunted to extinction, leaving the deer in that region with no predator threat.
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Graph Half Sheet and Go Over Answers
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Hare and Lynx Populations WS
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Day 3: LT: What happened with the hare and lynx
populations from yesterday’s worksheet?
Warm Up: I can identify density-independent
and density-dependent factors that impact
populations.
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Go over answers to Hare and Lynx WS
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Density - Independent Factors- Natural disasters
- Temperature
- Sunlight
- Human activities
- Physical
characteristics
- Behaviors
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Density - Dependent Factors- Competition
- Predation
- Disease
- Parasitism
- Space Availability
- Stress
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Is this a Density-Independent or Density-Dependent Factor?
A disease attacking and killing coyotes
A: Density-dependent
A flood
A: Density-independent
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Is this a Density-Independent or Density-Dependent Factor?
Competition for space to grow on the forest floor
A: Density-dependent
Competition for mates
A: Density-dependent
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Is this a Density-Independent or Density-Dependent Factor?
A: Density-independent
Poaching elephant tusks for the ivory trade
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Kaibab Case Study
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Day 4: Quiz
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Day 5: Field studyLT: I can identify limiting factors and populations in my field study plot.