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P and s successions

Primary and secondary successions

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P and s successions

  1. 1. Changes in Ecosystems: . Ecological Succession
  2. 2. <ul><li>Do all ecosystems stay the same all the time? </li></ul><ul><li>What are some things that cause changes to ecosystems? </li></ul><ul><ul><li>Natural and unnatural (Quickly and slowly) </li></ul></ul>
  3. 3. Ecological succession <ul><li>DEFINITION: </li></ul><ul><li>Series of predictable changes that occur in a community over time. Caused by: </li></ul><ul><ul><li>Physical environment </li></ul></ul><ul><ul><li>Natural disturbance </li></ul></ul><ul><ul><li>Human disturbance </li></ul></ul>
  4. 4. Primary Succession <ul><li>Begins in a place without any soil </li></ul><ul><ul><li>Sides of volcanoes </li></ul></ul><ul><ul><li>Landslides </li></ul></ul><ul><ul><li>Glacier melting </li></ul></ul><ul><li>Starts with the arrival of living things such as lichens that do not need soil to survive, called PIONEER SPECIES. </li></ul>
  5. 7. Pioneer species
  6. 8.
  7. 9. Primary Succession
  8. 10. <ul><li>Reaching a mature community can take CENTURIES. </li></ul>
  9. 11. Secondary Succession <ul><li>It´s the series of changes that occur in an area where the ecosystem has been disturbed, but where soil and organisms still exist. </li></ul>
  10. 13. <ul><li>Succession following a disturbance that destroys a community without destroying the soil </li></ul><ul><li>Natural Human disturbance </li></ul><ul><ul><li>Hurricane - Farming </li></ul></ul><ul><ul><li>Fires - Forest clearing </li></ul></ul>
  11. 17. Secondary succession <ul><li>Unlike primary succession, secondary succession occurs in a place where and ecosystem currently exists. </li></ul><ul><li>And occurs more rapidly than primary succession. </li></ul>
  12. 18.
  13. 19.
  14. 20. References: <ul><li> </li></ul><ul><li>Science explorer Prentice Hall. Environmental Science </li></ul>
  15. 21. CLASSWORK <ul><li>PAGE 35 </li></ul>