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Ecological Succession: Changes in Communities Over Time

Explore the concept of ecological succession and how communities change over time after natural or human disturbances. Learn about primary and secondary succession, pioneer and climax communities, and the organisms involved. Discover the benefits and drawbacks of succession in promoting growth and rebuilding communities.

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Ecological Succession: Changes in Communities Over Time

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  1. Think About It • What happens to an open field after a major fire has destroyed the area? • After a volcanic eruption, and new land is formed will life exist here again?

  2. Ecological Succession • Write the information that is in BLUE in your notebook

  3. Ecological Succession How do communities change over time?

  4. Ecological Succesion • Definition: predictable changes that occur in a community over time

  5. Causes of Ecological Succession • Natural and human disturbances • Older organisms move out new move in • Wildfires, floods, melting of glaciers

  6. Types of Ecological Succession • Primary Succession • Secondary Succesion

  7. Primary Succession

  8. Primary Succession • First growth of community • No soil exists on surface • Happens on bare rock after volcanic lava cools and forms rock • Happens after glacier melts and exposes rock

  9. Human Disturbance

  10. Secondary Succession

  11. Secondary Succession • Second growth of community • Happens after a disturbance (wildfire, abandoned cleared land) • SOIL remains in community after disturbance

  12. Order of succession • 1- Pioneer species: first communities to appear • 2- Intermediate species • 3- Climax Community- final communities

  13. Organisms of Succession • Primary Succession (on rock) Lichensmoss grass small shrubs soft trees hardwood trees • Secondary Succession (on soil) Small plants grasses, perrenialsshrubs, soft trees (pine) mature forest (oak, hickory)

  14. Succession is Good? Bad? • Succession Good promotes growth in a community, returns nutrients to the soil after disturbance (wildfire) • Succession Bad established communities are destroyed, takes a long period of time to build climax community

  15. SUCCESSION TAKES A LONG TIME • SUCCESSION TAKES A LONG TIME • SUCCESSION TAKES A LONG TIME • SUCCESSION TAKES A LONG TIME • SUCCESSION TAKES A LONG TIME • SUCCESSION TAKES A LONG TIME

  16. Succession in Water

  17. Summary Questions • How long does succession take? • Two types of ecological succession are… • First species to develop in succession are… • Primary succession occurs on… • Secondary succession occurs on…

  18. Comparison T- chart • Create a T- chart that compares the following features of succession • Causes • Begins with… • Type of pioneer species • Length of time

  19. T-chart

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