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Name
Date
Key Concept Builder
Class
LESSON 3
How Ecosystems Change
Key Concept How do land ecosystems change over time?
Directions: Answer each question or respond to each statement in the space provided.
Primary Succession
1. Draw an area of molten lava that has flowed
over the ground and cooled.
2. What creates the ground after the lava cools
and hardens?
3. Draw the same area showing the first
organisms that live there.
4. What are the specific pioneer species in your
drawing, and how did they get to the area?
How do these species change the area?
5. Draw the same area showing more organisms
living there.
6. Which organisms did you draw, and how did
they get there? How does the soil change?
7. Draw the same area after many years.
8. Describe the ecosystem in your drawing.
Biomes and Ecosystems
55
Name
Date
Class
Key Concept Builder
LESSON 3
How Ecosystems Change
Key Concept How do land ecosystems change over time?
Directions: Complete the Venn diagram below by writing features of primary succession on the left and
secondary succession on the right. Write what they have in common in the center.
1. Primary Succession
2. Both
3. Secondary Succession
Directions: Answer each question or respond to each statement on the lines provided.
4. Define pioneer species.
5. What are two common pioneer species?
6. Why are pioneer species not necessary for secondary succession?
56
Biomes and Ecosystems
Name
Date
Class
Key Concept Builder
LESSON 3
How Ecosystems Change
Key Concept How do aquatic ecosystems change over time?
Directions: Complete this concept map by drawing a pond ecosystem in box 1, aquatic succession occurring in
box 2, and the final stage of this succession in box 3.
Aquatic Succession in a Pond
1.
2.
3.
4. Explain what happened between your drawing in box 1 and your drawing in box 2.
5. Explain what has happened in box 3.
6. Define eutrophication and explain how it occurs.
7. How do humans contribute to eutrophication?
Biomes and Ecosystems
57