Ecological Successions

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Primary and secondary successions

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  • 1. Changes in Ecosystems: . Ecological Succession

2.

  • Do all ecosystems stay the same all the time?
  • Whatare some things that cause changes to ecosystems?
    • Natural and unnatural (Quickly and slowly)

3. Ecological succession

  • DEFINITION:
  • Series of predictable changes that occur in a community over time. Caused by:
    • Physical environment
    • Natural disturbance
    • Human disturbance

4. Primary Succession

  • Begins in a place without any soil
    • Sides of volcanoes
    • Landslides
    • Glacier melting
  • Starts with the arrival of living things such as lichens that do not need soil to survive, called PIONEER SPECIES.

5. 6. 7. Pioneer species 8. http://www.life.uiuc.edu 9. Primary Succession http://uisstc.georgetown.edu http://www.uncw.edu 10.

  • Reaching a maturecommunity can take CENTURIES.

11. Secondary Succession

  • Its the series of changes that occur in an area where the ecosystem has been disturbed, but where soil and organisms still exist.

12. 13.

  • Succession following a disturbance that destroys a community without destroying the soil
  • NaturalHuman disturbance
    • Hurricane - Framing
    • Fires - Forest clearing

14. 15. 16. 17. Secondary succession

  • Unlike primary succession, secondary succession occurs in a place where and ecosystem currently exists.
  • And occurs more rapidly than primary succession.

18. http://www.geo.arizona.edu 19. http://www.ux1.eiu.edu 20. References:

  • http://www.slideshare.net/radhakrishnan1962/ecological-succession-1
  • Science explorer Prentice Hall. Environmental Science