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Succession Notes. Succession. The change in biological communities of an area over a long period of time. Types of Succession:. Primary Initial establishment & development of a community occurs on barren rock volcanic eruption, glacial retreat, pavement

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succession
Succession
  • The change in biological communities of an area over a long period of time
types of succession
Types of Succession:

Primary Initial establishment & development of

a community

occurs on barren rock

  • volcanic eruption, glacial retreat, pavement

Secondary Reestablishment of a community

  • remnants of previous community is still there
  • abandoned field, after fire, flood, or hurricane
stages of succession
Stages of Succession:
  • Bare Rock
    • No soil, no available nutrients, no active life……not a community
stages of succession5
Stages of Succession:
  • Lichens&Mosses
    • Pioneer Species
      • First to colonize rocks
      • secrete acid onto rock which liberates nutrients that can be absorbed
      • catches wind-blown dirt
      • can take 100s to 1000s of years
      • very vulnerable to erosion
      • least diverse and least stable
stages of succession6
Stages of Succession:
  • Grasses & Shrubs
    • Early Succession Plants
      • don’t need deep soil
      • like full sun
      • shrubs move in and shade out grasses, killing them
stages of succession7
Stages of Succession:
  • Softwood
    • Midsuccession Plants
      • trees that need a lot of sunlight
      • Cedar, pine
stages of succession8
Stages of Succession:
  • MixedHardwood Mature Forest
    • deciduous trees; oaks, maples, hickories, beech
    • saplings are shade-tolerant for the first few years
    • when an adult tree dies it leaves a hole in the canopy
    • saplings race to the top, grow tall quickly-not wide

then grow slowly

    • Most Diverse, least likely to erode, very productive
    • Dominant species is reproducing, therefore climax stage