Ecosystem energy flow (part 2)


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Ecosystem energy flow (part 2)

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