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Ecology energy flow food chains


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Ecology energy flow food chains

  1. 1. Ecology! The study of interactions among organisms and their environments
  2. 2. Levels of Organization   The biosphere is where all life exists Ecosystems include living (biotic) and non-living (abiotic) factors
  3. 3. Levels of Organization   Populations consist of organisms of the same species living in an area Communities have several populations in an area pg. 64-65
  4. 4. Energy Flow: Producers The SUN provides energy  Producers make food (autotrophic)  – Plants and some bacteria are photosynthetic – Some bacteria do chemosynthesis
  5. 5. Energy Flow: Consumers  Heterotrophs rely on other organisms for their energy – ie: herbivores, carnivores, omnivores, detrivores, and decomposers
  6. 6. Food Chains  Energy is transferred through an ecosystem when organisms eat or are eaten
  7. 7. Trophic Levels  Feeding levels in a food chain or web – 1st Trophic Level – Producers – 2nd Trophic Level – 1st Order (Primary) Consumer…ETC  Each consumer depends on the trophic level below it for energy!
  8. 8. Figure 3-8 A Food Web Food Web Section 3-2  Many food chains together form a food web Pg. 71
  9. 9. Pyramid of Energy  10% of the energy at one trophic level is available to the organisms at the next level.
  10. 10. Biomass Pyramid The amount of living tissue and thus potential food  Typically the greatest biomass is at the base 
  11. 11. Pyramid of Numbers Relative number of individual organisms at each level  In certain ecosystems, it is NOT pyramid shaped 