Quantative features of populations

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  • Quantitative features of populations
    • Species density: measure of the number of species per unit area
    • Species Density
      • Measure of how often a certain species is recorded in a sample (%)
      • if a species occurs 4 out of 10, than its 40%
    • Percentage plant cover
      • measure of the proportion of ground that is covered by vegatation
      • divided by different species
      • method used depends on size of plants
    • Grid quadrats
      • Number of squares that is covered will be the percentage
    • Point quadrats
      • row of 10 metal rods
      • every time a rod touches a species, its 10%
    • Location
      • should be placed using random or systematic sampling
      • Bias if chosen by observation alone


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