Community Structure & Community Change

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  1. succession
    • non-seasonal, directional, and continuous pattern of colonization and extinction on site
    • process of community change over time
  2. degradative
    • type of succession that results in depletion of resource "packets" (ie. dead body, leaf litter) by community of decomposers, detrivores, and scavengers
    • decomposer: breaks down resource "packets"
  3. primary succession
    • succession on a previously unoccupied site
    • ex: production of lava fields; volcano erupts, lava flows down side, lava cools, plants begin to colonize
    • ex: carcass succession because the site had not been colonized in any real sense before the new colonizing community members
  4. secondary succession
    succession on a previously occupied site
  5. allogenic
    • results from external geological, physical, and/or community forces
    • ex:bacterial communites in the bottoms of lakes are ponds; rate of succession is dependent on rate of sedimentation from subsequent rains
  6. autogenic
    succession driven by the action of the community members themselves
  7. classical view of succession
    • Clement's monoclimax hypothesis
    • if succession occurs, change will occur, but change will eventually stop and a given community will reach the monoclimax
    • monoclimax: single, repeatable end
    • ex: old field succession monoclimax = deciduous forests
  8. facilitation
    • successional mechanism in which only certain pioneers can colonize
    • pioneers alter site conditions
    • later species require such site alteration
    • competition eliminates early species
    • sequence continues until facilitation stops
  9. tolerance
    • succession mechanism in which all species can be a pioneers
    • pioneers have little effect on subsequent recruitment
    • competition eliminates early species
    • sequence continues until only superior competitors are present (k-selection)
  10. inhibition
    • opposite of facilitation
    • all species can be pioneers
    • pioneers make site less suitable for others
    • succession stops at pioneers
    • disturbance are required for continued succession and new, late colonizer
Card Set:
Community Structure & Community Change
2011-04-27 03:31:28


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