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Community Ecology (Community and Diversity (diversity - the variation in…

- - - - c - constant found from studying individual communities
      - A - area used
      - z - constant found from studying individual communities
      - S - number of species
    - - Spatial Scale
- - - - dN/dt=rN-aNP - Models the net rate of change in prey numbers as
        
        r - the intrinsic rate of increase for the prey species
        
        N - the number of individuals of prey species in the community
        
        dN/dt - the rate of change with time of the prey
        
        a - the number of prey eaten per prey per predator per unit of time( a - is prey dependant)
      - dP/dt=faNP-qP - the net rate of change of predators numbers
        
        f - a constant indicating the predators efficiency at converting prey it has eaten into new predators
        
        q - the predators per capita mortality rate which is independent of population density
        
        dP/dt - is the rate of change with time of the predator population
    - - Feed Rate - refers to how quickly a predator can find new prey
      - Handling Time - refers to how quickly a predator can consume its prey
  - - - Bracken Fern - intense competitor, takes over entire areas as its leaves catch sunlight above the shrubs and the stem spreads underground
    - - Resource - any substance or factor that can lead to increased growth rates
- - - - 2) patches can be occupied by species and others can't
      - 3) empty patches colonized by migration from occupied patches
      - 1) region of environment has many patches where species live
        
        high-quality patch is called a source habitat
        
        low-quality patch is called a sink habitat
      - 4) populations within patches have probability of going extinct within that patch
- - - - Selaginella Pilifera - nurse plant to Echinocereus Pectinatus, a small cactus