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Energy Flow - Food Chains/Webs


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Energy Flow - Food Chains/Webs

  1. 1. Unit 4: Energy Flow Objective #1: Interrelationships and energy flow within a food chain and food web
  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
  4. 4. Energy Flow • Living things need energy • For growth, reproduction, metabolic processes • No energy  No life! • Where does energy come from?
  5. 5. Energy Flow: Producers • The SUN provides energy • Producers make food (autotrophic) • Plants and some bacteria are photosynthetic • Some bacteria are chemosynthetic
  6. 6. Energy Flow: Consumers • Heterotrophs rely on other organisms for their energy • ie: herbivores, carnivores, omnivores, scavengers, decomposers, and detritivores
  7. 7. Food Chains • Energy is transferred through an ecosystem when organisms eat or are eaten
  8. 8. 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!
  9. 9. Figure 3-8 A Food Web Food Web Section 3-2 • Many food chains together form a food web
  10. 10. Pyramid of Energy • 10% of the energy at one trophic level is available to the organisms at the next level.
  11. 11. Biomass Pyramid • The amount of living tissue and thus potential food • Typically the greatest biomass is at the base
  12. 12. Pyramid of Numbers • Relative number of individual organisms at each level • In certain ecosystems, it is NOT pyramid shaped