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Biology I: Energy Flow Through an Ecosystem (part 2) Food Chains, Food Webs, Energy Pyramids
Agenda – Tues. Oct. 4, 2011 <ul><li>Warm-Up </li></ul><ul><li>Lesson </li></ul><ul><li>Wrap-Up  (Identifying food chains) ...
Today’s Objectives <ul><li>I will explore energy flow within an ecosystem. </li></ul><ul><li>I will define: ecosystem, her...
Warm-Up <ul><li>What do decomposers do? </li></ul><ul><li>If you ate chicken that previously ate grass, what type of consu...
What is an Ecosystem? <ul><li>An  Ecosystem  is  all of the living organisms and non-living environment found in a particu...
What is an Ecosystem? <ul><li>Example: a pond or aquatic ecosystem </li></ul><ul><ul><li>Living Things:  fish, turtles, al...
Trophic Level <ul><li>Each feeding level in an ecosystem </li></ul><ul><li>Each level of a  food chain  or  food web </li>...
Trophic Level <ul><li>Second Trophic Level:   made up of primary consumers </li></ul><ul><li>Herbivores:   primary consume...
Trophic Level <ul><li>Third Trophic Level:   made up of secondary and tertiary consumers </li></ul><ul><li>Omnivores:  con...
Trophic Level <ul><li>Carnivores:  consumers that mainly eat other animals </li></ul><ul><li>Examples: lions and sharks </...
Food Chain <ul><li>The flow of energy  from the sun to producers to primary consumers then to higher order consumers can b...
Food Chain <ul><li>Shows only  one path  for the flow of energy in an ecosystem. </li></ul>
Food Web <ul><li>Ecosystems have many different types of food chains.  </li></ul><ul><li>A  food web  shows how many diffe...
Example Food Web
Energy Pyramid <ul><li>Energy Pyramids  show the  energy loss between trophic levels  in an ecosystem. </li></ul><ul><li>T...
Energy Pyramid <ul><li>The amount of available  energy decreases up the energy pyramid. </li></ul>
Energy Pyramid <ul><li>Most of the  “lost” energy is released as heat  into the environment. </li></ul><ul><li>Each trophi...
How Many Chains are in this web? copyright cmassengale
Identify the Producers, Consumers, and Decomposers
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Ecosystem energy flow (part 2)

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Transcript of "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
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