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Geog100 ecology 2011
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Geog100 ecology 2011

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Transcript

  • 1. Some Basic Concepts of Ecology
    Geog 100
  • 2. Ecology Ecosystem
  • 3. Habitat Niche
  • 4. Trophic Levels
    Producers (mainly plants)
    Consumers –
    1st level – herbivores
    2nd level – primary carnivores (eat herbivores)
    3rd level – secondary carnivores (eat other carnivores)
    Also – Omnivores – eat from multiple sources
    Also – Scavengers – eat dead materials
  • 5. Food Webs & Trophic Levels
  • 6. Bio-accumulation, Biomagnification
    Organisms accumulate persistent toxins from the environment as they take in contaminated air and water. Those toxins accumulate in their tissues.
    Then, organisms higher in the food chain ingest many of those smaller organisms, and the amount of toxins is magnified.
    Thus creatures higher in the food chain are more likely to suffer from toxic effects.
  • 7. Energy flows & Material Cycles
  • 8. Example: DDT
    video

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