Predation

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Author:
wvuong
ID:
73044
Filename:
Predation
Updated:
2011-03-15 05:52:37
Tags:
wendy
Folders:

Description:
ecology
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  1. effects of predation.
    • set carrying capacity
    • -set distribution limits of prey
    • -influence age/size frequencies within prey populations
    • -influence diversity of community
  2. equation:
    growth of prey population =
    intrinsic growth of prey population - removal of prey by predators
  3. stabilizing factor for predator-prey interactions.
    • -density-dependent limitation on either predator or prey population (self-limitation)
    • -alternative food source for predator
    • -refuges for prey in restriccted part of habitat (untouchable reserve)
    • -influx of new replacement individuals from source population
  4. example of predator/prey cycles.
    • owl/vole population in Scandinavia.
    • Northern scandinavia - 4 cycles (voles protected by snow)
    • Southern Scandinavia - 1 yr cycle.
  5. parasitoids.
    directly kill hosts.

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