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Exploring Trophic Levels and Energy Transfer in Ecosystems

Understand the concept of trophic levels, differentiate between food chains and webs, and explore the energy transfer at each level. Discover the relationship between trophic pyramids and food chains/webs.

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Exploring Trophic Levels and Energy Transfer in Ecosystems

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  1. Description: Goals: Describe the Concept of the Trophic Levels Distinguish between food chains and webs. Define ecological pyramid and explain its relationship to energy in the ecosystem Discuss the change in available energy from one trophic level to the next and what the energy change implies on the organisms found in the levels. Relate trophic pyramids and food chains/web.

  2. Objectives: Day 3 Describe each level of the Trophic Pyramid in terms of available energy. Interpret and describe food chains and food webs. Describe the relationship between food chains/webs and the trophic pyramid.

  3. Warm-Up PART 1 Q = Fill in the Chart A = Omnivores Top Consumer Secondary Consumer (Carnivores) Primary Consumers (Herbivores) Primary Producers (Autotrophs) Scavengers Decomposers

  4. Quiz • Name all 6 kingdoms of life and provide one fact about each.

  5. Objectives: Day 3 Describe each level of the Trophic Pyramid in terms of available energy. Interpret and describe food chains and food webs. Describe the relationship between food chains/webs and the trophic pyramid.

  6. Warm-Up PART 2 Design an Energy Pyramid • Now add examples to each role • Ex. Instead of Primary Producer use a plant

  7. Red Fox Deer Mouse Blackberry bush

  8. Think… • Consider the trophic pyramid: • Which levels generally have predators and/or prey? • Is there a relationship to physical size of the organism and location on the pyramid? • Which organism need the greatest amount of food to survive? • What is the purpose of food?

  9. Pair… • Consider the trophic pyramid: • Which levels generally have predators and/or prey? • Is there a relationship to physical size of the organism and location on the pyramid? • Which organism need the greatest amount of food to survive? • What is the purpose of food?

  10. Share… • Consider the trophic pyramid: • Which levels generally have predators and/or prey? • Is there a relationship to physical size of the organism and location on the pyramid? • Which organism need the greatest amount of food to survive? • What is the purpose of food?

  11. Trophic Levels and Energy Predict in your “Pair” • In what way is energy transferred from one organism to another? • Where would you expect there to be the greatest amount of energy available? • Where would be the least? • What does that mean for the organisms on the different trophic levels?

  12. Trophic Levels and Energy Share your thoughts with the class! • In what way is energy transferred from one organism to another? • Where would you expect there to be the greatest amount of energy available? • Where would be the least? • What does that mean for the organisms on the different trophic levels?

  13. Energy Lossat each Step 0.01% .01% 1% • Each Trophic Level has energy • 90% of the energy is lost when moving from one level to the next. 10% 100%

  14. The loss of energy affects the organisms in the Ecosystem If there’s less energy to survive, then there are less organisms! So what happens to the number of organisms as you move from Primary Produces to Primary Consumers to Secondary Consumers?

  15. Food Chains • Food Chains = Sequence of energy being transferred from one organism to another. • Trophic Levels = each step of energy transfer

  16. ISN’T THISA FOOD CHAIN! Red Fox Deer Mouse Blackberry bush

  17. Many Food Chains in each Ecosystem

  18. If you take all of the food chains in an ecosystem you get a Food Web

  19. So what does a Food Web show? • ? • Food webs show all of the possible transfers of energy in an ecosystem.

  20. So which is more complex? • Food Webs or Food Chains? • Why?

  21. Use the packet of pictures too… • Categorize the organisms into: • Primary Source for Earth • Producers • Herbivores • Carnivores • Now make three food chains • Include a primary producer, primary consumer, secondary consumer, top consumer

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