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Succession and Stability - PowerPoint PPT Presentation


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Succession and Stability. Introduction. Succession : Gradual change in plant and animal communities in an area following disturbance. Primary succession on newly exposed geological substrates. Secondary succession following disturbance that does not destroy soil.

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Presentation Transcript
introduction
Introduction
  • Succession: Gradual change in plant and animal communities in an area following disturbance.
    • Primary succession on newly exposed geological substrates.
    • Secondary succession following disturbance that does not destroy soil.
  • Climax Community: Late successional community that remains stable until disrupted by disturbance.
community and ecosystem stability
Community and Ecosystem Stability
  • Stability: Absence of change.
  • Resistance: Ability to maintain structure and function in face of potential disturbance.
  • Resilience: Ability to recover from disturbance.
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http://soulchaser.blogspirit.com/images/medium_pdr_0249.jpg

  • Are populations organized into discrete communities?
  • Humboldt hiked up Mt. Chimborazo to an elevation of 5878m.
  • He recorded vegetation along the elevational gradient.
  • What order?
    • * Ferns and palms* Grass and lichens* Oak forest* Broad-leaved herbaceous plants* Evergreen shrubs
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Are populations organized into discrete communities?

  • Clements and others (ex. Kuchler map) felt communities were essentially superorganisms
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Are populations organized into discrete communities?

  • Gleason argued for subtle transitions as opposed to sharp boundaries. He suggested a continuum.