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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