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Energy Flow In An Ecosystem

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Energy Flow In An Ecosystem

  1. 1. Ecosystems and You Ms. Thao Le
  2. 2. Energy Flow Through An EcosystemLearning Goals:• Explain how energy flows through an ecosystem• Describe how energy flow can be represented in an ecosystem• Identify the key actors that contribute to energy flow in an ecosystem• Explain the importance of nutrient cycling
  3. 3. Energy Flow Through An Ecosystem• What do you already know?• Who are the key players in an ecosystem• How is energy flow represented in an ecosystem?1. Food Chain + Nutrient Cycle2. Food Pyramid + Nutrient Cycle
  4. 4. EcosystemWhat is an ecosystem?
  5. 5. Ecosystem ClimateAnimals Soil Vegetation
  6. 6. Ecosystem• An ecological community consisting of plants and animals living together in a particular environment.• They depend on each other and the non-living parts of their environment such as rocks, soil, water, sunlight, and temperature.
  7. 7. EnergyHow does energy flow through an ecosystem?
  8. 8. http://www.globalchange.umich.edu/globalchange1/current/lectures/kling/ecosystem/zebra2.gif
  9. 9. Energy Flow Through An Ecosystem• Sun• Consumers1. Primary2. Secondary3. Tertiary• Decomposers + Nutrient Cycling
  10. 10. Energy Flow Through An Ecosystem• Starts with the Sun (Our largest energy source on Earth!)• Photosynthesis-The chemical reaction by which green plants use water, carbon dioxide and light from the sun to make glucose.• ENERGY is stored in glucose; glucose is stored as starch.
  11. 11. Energy Cycle
  12. 12. Energy Flow Through An Ecosystem• Organisms that can make their own (energy) in the form of glucose are called Producers.• Examples: Plants, Algae• The energy that is unused by producers are passed on to organisms that cannot make their own energy called Consumers.• Examples: Fish, Dog, Cat, Tiger, You
  13. 13. Energy Flow Through An EcosystemTypes of Consumers:• Primary Consumer- 1st Order, ex: Herbivores= Plant eaters• Secondary Consumer-2nd Order, Consumers to eat another consumer, ex: Herbivores, Carnivores=Meat eaters• Tertiary Consumer-3rd Order, A consumer that eats a consumer that already ate a consumer• Scavengers + Decomposers-Getting read of dead stuff, returning energy into nutrient form
  14. 14. Energy Flow Through An Ecosystem• Most of the energy the primary consumer gets from the producer is used by the consumer.
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  18. 18. Energy Flow Through An Ecosystem• Scavengers-they eat dead stuff. Ex: Vultures• Decomposers-they breakdown what the scavengers eat to return the energy back into the soil where plants can use it. Ex: Worms, Insects, Bacteria• Nutrient Cycling :(C, O, H, N, P). Ex: Worms using nutrients (minerals) in soil or Algae using Phosphorus in a body of water.
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  22. 22. Energy Flow Through An Ecosystem• Energy is not recycled; it is constantly being supplied by the Sun.• Energy is lost in the form feces, tissue loss, and death which releases heat.• Nutrients are recycled as there is only a limited supply.
  23. 23. Energy Flow Through An Ecosystem• The transfer of energy from sun to producer to primary consumer to secondary consumer to tertiary consumer can be shown in a FOOD CHAIN.
  24. 24. Energy Flow Through An Ecosystem• Another way of showing the transfer of energy in an ecosystem is the ENERGY PYRAMID.
  25. 25. Energy Flow Through An EcosystemFood Pyramids Show:• That the amount of available energy decreases down the food chain• It takes a large number of producers to support a small number of primary consumers• It takes a large number of primary consumers to support a small number of secondary consumers
  26. 26. Energy Flow Through An EcosystemHelp me classify which role these organisms in the videos represent in a food chain:• http://www.youtube.com/watch?feature=play er_embedded&v=HN9j0y9bivo• http://www.youtube.com/watch?feature=play er_embedded&v=xFQ_fO2D7f0
  27. 27. Energy Flow Through An Ecosystem• What is an ecosystem?• How does energy flow through an ecosystem?• Describe how the transfer of energy can berepresented? (Hint: We reviewed 2 types.)• Identify the key players in an ecosystem.• Why is nutrient cycling important?
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