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Ecosystem energy flow (part 2)



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  • 1. Biology I: Energy Flow Through an Ecosystem (part 2) Food Chains, Food Webs, Energy Pyramids
  • 2. Agenda – Tues. Oct. 4, 2011
    • Warm-Up
    • Lesson
    • Wrap-Up (Identifying food chains)
    • Wrap-Up (Identifying producers, consumers, decomposers)
    • Homework Worksheet
  • 3. Today’s Objectives
    • I will explore energy flow within an ecosystem.
    • I will define: ecosystem, herbivores, omnivores, carnivores, food chain, food web, energy pyramid.
    • I will trace food chains within a food web.
    • I will classify organisms as: producers, consumers, or decomposers.
  • 4. Warm-Up
    • What do decomposers do?
    • If you ate chicken that previously ate grass, what type of consumer would you be?
    • Where does energy flow ultimately begin?
  • 5. What is an Ecosystem?
    • An Ecosystem is all of the living organisms and non-living environment found in a particular place
  • 6. What is an Ecosystem?
    • Example: a pond or aquatic ecosystem
      • Living Things: fish, turtles, algae, insects,
      • bacteria
      • Non-Living Things: physical and chemical properties of the pond like the amount of oxygen in the pond and its pH
  • 7. Trophic Level
    • Each feeding level in an ecosystem
    • Each level of a food chain or food web
    • First Trophic Level: made up of only producers
  • 8. Trophic Level
    • Second Trophic Level: made up of primary consumers
    • Herbivores: primary consumers that mainly eat plants
    • Examples: rabbits and grasshoppers
  • 9. Trophic Level
    • Third Trophic Level: made up of secondary and tertiary consumers
    • Omnivores: consumers that eat both plants and animals
    • Examples: humans and squirrels
  • 10. Trophic Level
    • Carnivores: consumers that mainly eat other animals
    • Examples: lions and sharks
  • 11. Food Chain
    • The flow of energy from the sun to producers to primary consumers then to higher order consumers can be shown in a food chain .
  • 12. Food Chain
    • Shows only one path for the flow of energy in an ecosystem.
  • 13. Food Web
    • Ecosystems have many different types of food chains.
    • A food web shows how many different types of food chains are connected.
    • Food webs show the feeding relationships in an ecosystem.
  • 14. Example Food Web
  • 15. Energy Pyramid
    • Energy Pyramids show the energy loss between trophic levels in an ecosystem.
    • The flow of energy:
      • radiant energy (sunlight)
      • chemical energy (stored in plants)
      • kinetic energy and heat loss (created as consumers feed on each other)
  • 16. Energy Pyramid
    • The amount of available energy decreases up the energy pyramid.
  • 17. Energy Pyramid
    • Most of the “lost” energy is released as heat into the environment.
    • Each trophic level contains fewer organisms.
      • Why does this make sense?
  • 18. How Many Chains are in this web? copyright cmassengale
  • 19. Identify the Producers, Consumers, and Decomposers