Do Now: List 2 things you learned about Ecological Succession. Or How will an ecosystem change after...

Do Now:

•List 2 things you learned about Ecological Succession.

Or

• How will an ecosystem change after a natural disaster over the years?

Objective: Understand the Concept of Ecological SuccessionKey Words: Ecological Succession, draining a marsh, clearing woodland to grow crops, strip mining.

Objective: Understand How Populations Change over TimeKey Words: Resources, Limiting Factors, Carrying Capacity

1970 1980 1990 2000 2010 2020Time in years

How Does Deer Population Grow Overtime?

Scenario #1

In 1970 the deer population of an island forest reserve about 518 square kilometers in size was about 2000 animals. The island forest reserve was the size of six times the island of Manhattan. The island had excellent vegetation for feeding and food supply, but not predators.

a. Make a Hypothesis •Predict how the deer population will change over the years.

• Give a rationale of your prediction.



b. Oh, My Deer! Population Game •Fill in the data table with the data collected from the population game.

Data Table

Trials (years)

Number of Deer Remaining

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15



• Construct a Line - Graph showing how the deer population has change over time in the game “Oh, Deer!”

• Label the X axis as “Time in years”• Mark an appropriate scale on the X axis.• Label the Y axis as “Total Number of Deer”• Mark an appropriate scale on the Y axis.• Plot the data on the grid. Surround each point with a small circle and connect the

points.

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Trials in Years



c. Conclusion

•Compare your hypothesis to your data graph.

•How did the deer population change over time?

It increased and decreased in a ______ years cycle over time.

• They have in common…

• They are different…



d. Discussion

• Why did the deer population sometimes increase?

•Why did the deer population sometimes decrease?

•Write examples of natural resources for a living thing Water, food, and shelter.

Plenty of water, food and shelter (natural resources) were available in the environment

Lack of water, food and shelter (natural resources) in the ecosystem.

Light, minerals, space,…



Do Now• List 2 things you learned about how the a population change over time. or • Explain what limiting factors and carrying capacity are. Examples.



d. Discussion

•What are limiting factors?

•What limiting factors affected the deer

in this game?

•What are some limiting factors that might affect deer but were not part of this game?

•What is the largest number of deer that ecosystem of the game can support?

•What is carrying capacity?

•What is the carrying capacity for deer of the ecosystem in the game?

Factors that limit the size of a population inan ecosystem

Water, food, and shelter

The maximum number of individuals of a species that the environment can support.

Predators, diseases, climate, temperature, hunters, and space

Do NowList 2 things you learned about limiting factors in the Oh, Deer! Game.

•What are limiting factor?•What are 3 limiting factors in the game?

How Deer Population Changes over Time

0

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Years

# o

f D

eer

Rem

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Years

# of Deer

Objective: How Populations Change over TimeKey Words: Resources, Limiting Factors, Carrying Capacity


Data tableTRIALS(Years)

# of Deer Remaining

1

2

3

4

5

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15

b) Results: Complete the data table and construct a Line - Graph with the results.

1. What limiting factors affected the deer in this game?

2. What are some limiting factors that might affect deer but were NOT part of this game?

3. What happened to the deer population over time?

Water, food, and shelter

Predators, diseases, climate, temperature, hunters, space

The deer population increased and decreased within the same range ( ___ – ___ )The deer populations shows a “dynamic equilibrium”


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# o

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Years

# of Deer


4. Why did the deer population sometimes increase after decreasing?

5. What might cause a deer population to decrease suddenly?

More natural resources were available in the environment

Nature resources were scarce, then more competition among deer.


0

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# of Deer


7. What is the largest number of deer (carrying capacity) that ecosystem can support?

The carrying capacity is ___ deer


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Years

# of Deer


Objective: How Populations Change over TimeDo Now: List 4 things that increase stability in an ecosystem

Do Now: List 2 things you learned about Ecological Succession. Or How will an ecosystem change after...

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