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Succession
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  • Tornadoes, clear-cutting, and fires all cause secondary succession. Volcanic eruptions destroy the soil base, so succession is primary– first build soil.
  • This picture follows the story in PLT.
  • In the east, the climax community may be different than the northwest.

Transcript

  • 1. Launch
    • What are the main criteria for writing a good procedure?
    • What is the difference between a scientific question and a hypothesis?
    • Write a quick 5 step procedure on how you would butter toast
  • 2. Launch
    • What are the main criteria for writing a good procedure?
      • Numbered steps, does not use pronouns, specific and to the point
    • What is the difference between a scientific question and a hypothesis?
      • A scientific question is based on just finding out what the answer is. A hypothesis predicts the answer and then tests to see the result
    • Write a quick 5 step procedure on how you would butter toast
      • Will vary by student
  • 3. SUCCESSION Natural Change Over Time
  • 4. What Is Succession?
    • A series of changes over time in the kind of plants growing in an area.
  • 5. Climax Communities
    • Stable communities at the end of succession
    • Vary with location and biome
    • Persist until there is an environmental change
  • 6. Disturbances
    • Can be caused by
      • natural events (fire, volcanic eruption)
      • human activities (deforestation)
      • animal activities (grazing, pests)
  • 7. Primary Succession
    • Plants become established on land missing soil and vegetation
    • First organisms are mosses and lichens
  • 8.  
  • 9. Secondary Succession
    • Dominant plants in the community are removed, allowing new plants to colonize.
    • The first plants are called
    • “ pioneers”– fast-
    • growing, full sunlight,
    • many seeds
    Landslide caused by Hurricane Mitch
  • 10. Primary or Secondary?
  • 11. Tree Tops Valley progression
    • Climax community is an evergreen forest
  • 12. Eastern Forests
    • Often climax community is hardwood.
  • 13. What happens to the animals?
    • Each plant group changes the environment.
    • Lichens and mosses make soil,
    • Enabling annuals and weeds which produce, seeds, humus and shade,
    • Allowing perennials and shade-tolerant species,
    • Leading to young trees and other woody plants ,
    • Eventually producing a mature forest
    • As the ecosystem changes, the animals change to accommodate the available food and shelter.