The Lessons on the Lake Logo Chapter 7: Ecosystems in Delicate Balance
Lesson 7.4 Lesson 7.5 Lesson 7.6 Lesson 7.7 Lesson 7.8 Lesson 7.9 Lesson 7.10
Lesson 7.1 Lesson 7.2 Lesson 7.3
Lessons on the Lake -> Chapter 7 -> Healthy vs. Unhealthy Ecosystems


Healthy vs. Unhealthy
Ecosystems

Each step in the FOOD CHAIN contains appropriate numbers of organisms
If one group becomes too numerous, the chain becomes UNBALANCED
Each step in the FOOD CHAIN contains appropriate numbers of organisms
For example, agricultural runoff creates a SURPLUS of nutrients which can cause sudden INCREASES in algae growth
Each step in the FOOD CHAIN contains appropriate numbers of organisms
Too much algae blocks sunlight from reaching vascular plants
Each step in the FOOD CHAIN contains appropriate numbers of organisms
Too few plants means LESS FOOD for herbivores
Less herbivores means LESS FOOD for primary consumers, etc.
As the chain becomes more and more UNBALANCED, the likelihood of ECOSYSTEM COLLAPSE is increased

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In adulthood, a manatee’s lungs can reach almost 3.5 feet in length.
  1. Ch. 7 Intro
  2. Essential Questions
  3. Ecosystems
  4. Energy Flow Through an Ecosystem
  5. Healthy vs. Unhealthy Ecosystems
  6. Biodiversity
  7. Threatened and Endangered Species in the Basin
  8. Decision Making and Issue Analysis
  9. Ecosystem Tumble
  10. Activity: I'm a Survivor