Succession

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Succession

  1. 1. Succession in Ecosystems
  2. 2. Succession <ul><li>a series of changes in a community in which new populations of organisms gradually replace existing ones </li></ul><ul><li>There are two types of succession: </li></ul><ul><ul><li>Primary succession </li></ul></ul><ul><ul><li>Secondary succession </li></ul></ul>
  3. 3. Primary succession <ul><li>colonization of new sites by communities of organisms – takes place on bare rock </li></ul>
  4. 4. Primary succession <ul><li>New bare rock comes from 2 sources: </li></ul><ul><ul><li>volcanic lava flow cools and forms rock </li></ul></ul>
  5. 5. Primary succession - <ul><li>New bare rock comes from 2 sources: </li></ul><ul><ul><li>Glaciers retreat and expose rock </li></ul></ul>
  6. 6. Pioneer organisms <ul><li>the first organisms to colonize a new site </li></ul><ul><ul><li>lichens are the first to colonize lava rocks </li></ul></ul>
  7. 7. Primary Succession PRIMARY SUCCESSION THEN PROCEEDS AS SMALLER, FASTER GROWING PLANT SPECIES ARE REPLACED BY SLOWER GROWING, MORE STABLE TREE SPECIES
  8. 8. Climax community <ul><li>a stable, mature community that undergoes little or no succession </li></ul>
  9. 9. Climax community <ul><li>In most of Ohio, the climax community would be a deciduous oak–hickory forest </li></ul>                                                                                                                                 
  10. 10. Primary succession SUCCESSION ENDS IN DIFFERENT CLIMAX COMMUNITIES IN DIFFERENT PARTS OF THE UNITED STATES
  11. 11. Secondary succession <ul><li>Sequence changes To a community that takes place when it is disrupted by natural disaster or human actions – takes place on existing soil </li></ul>
  12. 12. Secondary succession example <ul><li>a fire levels portions of a forest community </li></ul>
  13. 13. <ul><li>A farmer plows his field </li></ul>Secondary succession example
  14. 14. Secondary succession THE DISTURBED AREA WILL GO THROUGH A SERIES OF CHANGES SIMILAR TO PRIMARY SUCCESSION IN WHICH SMALLER, FASTER GROWING SPECIES ARE GRADUALLY REPLACED BY LARGER, MORE STABLE TREE SPECIES
  15. 15. Secondary succession
  16. 16. Pond Succession SMALLER POND HABITATS CAN ALSO UNDERGO SUCCESSION AS THEY FILL IN WITH SEDIMENT AND SOIL AND SLOWLY CHANGE INTO A CLIMAX FOREST COMMUNITY
  17. 17. Pond Succession

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