Chpt.2.2

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Chpt.2.2

  1. 1. 2.2 Flow of Energy in an Ecosystem
  2. 2. What is thesource of allenergy in thisecosystem?What pathdoes thisenergy taketo get to thehawk?
  3. 3. AutotrophsAlso called producersorganisms that use energy from the sun or energy stored in chemical compounds to manufacture their own foodExamples: plants & Chlorophyll- containing single cell organisms
  4. 4. Heterotrophsalso called consumersorganisms that depend on autotrophs as their source of nutrients and energyexamples: cow, rabbit, wolf
  5. 5. Herbivoresconsumers that depend on plants for their foodexamples: grazing, seed-eating, algae-eating, plant eating animalBees, grasshoppers, elephants
  6. 6. Carnivoresconsumers that kill and eat only other animals
  7. 7. Scavengersconsumers that eat animals that are already dead (do not kill for food)feed on carrion, refuse, and similar dead organisms example: black vultures
  8. 8. Omnivoresconsumer that eats both plants and animalsexamples: humans, raccoons, coyotes, bears
  9. 9. Decomposersbreak down dead organisms by releasing digestive enzymesexamples: bacteria & most fungi
  10. 10. Food Chainmodel scientists use to show how matter and energy move through an ecosystemarrows represent the levels and the direction the energy is flowinga food chain consist of three to five linksenergy is “lost” as heat at each link
  11. 11. FoodChain
  12. 12. Food Weba network of interconnected food chainsexpresses all the possible feeding relationships at each trophic level in a communitya more natural model
  13. 13. FoodWeb
  14. 14. Ecological pyramiddepicts energy conversions in an ecosystembase = producershigher trophic levels = consumerssource of energy for all ecological pyramids is energy from the sun; energy is always being replenished
  15. 15. Energy Pyramid 4th trophic 3rd order level Carnivore heterotrophs 3rd trophic Omnivore 2nd order level heterotrophs 2nd trophic Herbivores 1st order level heterotrophs1st trophic 1st trophic level – autotroph Producer Auto- level trophs

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