Succession%20in%20Ecosystems

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Succession in Ecosystems

• Biology SB4

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Succession-

• a series of changes in a community in which new
  populations of organisms gradually replace
  existing ones

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Primary succession-

• colonization of new sites by communities of
  organisms takes place on bare rock

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Primary succession-

• New bare rock comes from 2 sources
• 1. volcanic lava flow cools and forms rock

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Primary succession-

• 2. Glaciers retreat and expose rock

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Pioneer organisms-

• the first organisms to colonize a new site
• Ex lichens are the first to colonize lava rocks

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Primary Succession-
Rock
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Climax community-

• a stable, mature community that undergoes little
  or no succession

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Climax community-

• Ex In most of Georgia, the climax community
  would be a deciduous oakhardwood forest

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Primary succession-
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Secondary succession-

• sequence of community changes that takes place
  when a community is disrupted by natural disaster
  or human actions takes place on existing soil

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Secondary succession-

• Ex
• A fire levels portions of a forest

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Secondary succession-

• Ex
• A farmer plows his field

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Secondary succession-
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Secondary succession-