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Chpt.2.2
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Transcript

  • 1. 2.2 Flow of Energy in an Ecosystem
  • 2. What is thesource of allenergy in thisecosystem?What pathdoes thisenergy taketo get to thehawk?
  • 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. Heterotrophsalso called consumersorganisms that depend on autotrophs as their source of nutrients and energyexamples: cow, rabbit, wolf
  • 5. Herbivoresconsumers that depend on plants for their foodexamples: grazing, seed-eating, algae-eating, plant eating animalBees, grasshoppers, elephants
  • 6. Carnivoresconsumers that kill and eat only other animals
  • 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. Omnivoresconsumer that eats both plants and animalsexamples: humans, raccoons, coyotes, bears
  • 9. Decomposersbreak down dead organisms by releasing digestive enzymesexamples: bacteria & most fungi
  • 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. FoodChain
  • 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. FoodWeb
  • 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. 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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