Geog100 ecology 2011

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Geog100 ecology 2011

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

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