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Topic 2: The Ecosystem
2.3.5: Measuring Biodiversity




            Simpson’s Index
Topic 2: The Ecosystem
2.3.5: Measuring Biodiversity


 “Biodiversity or biological diversity is the variety of life in
 all its forms, levels and combinations, including ecosystem
 diversity, species diversity and genetic diversity” (IUCN,
 UNEP and WWF, Rio Summit on Biodiversity, 1991).
Topic 2: The Ecosystem
2.3.5: Measuring Biodiversity


 Simpson’s Diversity Index is a fairly simple way of
 estimating species diversity in an ecosystem.

 The formula is:
 Simpson’s D.I

 = N (N – 1)
 
     where: N = total number of individuals
   Σ n (n – 1)
 
   and n = total numbers of individuals of each species
Topic 2: The Ecosystem
2.3.5: Measuring Biodiversity

An example

                  Species      Number of individuals   Number of individuals
                                 in Ecosystem 1          in Ecosystem 2

        A                                         23                       2
        B                                         28                       2
        C                                         22                       1
        D                                         27                      93
        Total individuals in                     100                      98
        ecosystem
Topic 2: The Ecosystem
2.3.5: Measuring Biodiversity

                                             Species            Number of         Number of
                                                              individuals in    individuals in
                                                              Ecosystem 1       Ecosystem 2
                                       A                                   23                    2
                                       B                                   28                    2
 For Ecosystem 1:                      C                                   22                    1
                                       D                                   27                93
                                       Total individuals in               100                98

 Simpson’s D.I. =                      ecosystem



                   100 x (100 – 1)                                         =        4.08
 [23x(23-1)] + [28x(28-1)] + [22x(22-1)] + [27x(27-1)]

 = N (N – 1)
 
     where: N = total number of individuals
   Σ n (n – 1)
 
   and n = total numbers of individuals of each species
Topic 2: The Ecosystem
2.3.5: Measuring Biodiversity




     The larger the number
    the greater the diversity
Topic 2: The Ecosystem
2.3.5: Measuring Biodiversity

So what about ecosystem 2?

                  Species      Number of individuals   Number of individuals
                                 in Ecosystem 1          in Ecosystem 2

        A                                         23                       2
        B                                         28                       2
        C                                         22                       1
        D                                         27                      93
        Total individuals in                     100                      98
        ecosystem

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Measuring Biodiversity

  • 1. Topic 2: The Ecosystem 2.3.5: Measuring Biodiversity Simpson’s Index
  • 2. Topic 2: The Ecosystem 2.3.5: Measuring Biodiversity “Biodiversity or biological diversity is the variety of life in all its forms, levels and combinations, including ecosystem diversity, species diversity and genetic diversity” (IUCN, UNEP and WWF, Rio Summit on Biodiversity, 1991).
  • 3. Topic 2: The Ecosystem 2.3.5: Measuring Biodiversity Simpson’s Diversity Index is a fairly simple way of estimating species diversity in an ecosystem. The formula is: Simpson’s D.I = N (N – 1) where: N = total number of individuals Σ n (n – 1) and n = total numbers of individuals of each species
  • 4. Topic 2: The Ecosystem 2.3.5: Measuring Biodiversity An example Species Number of individuals Number of individuals in Ecosystem 1 in Ecosystem 2 A 23 2 B 28 2 C 22 1 D 27 93 Total individuals in 100 98 ecosystem
  • 5. Topic 2: The Ecosystem 2.3.5: Measuring Biodiversity Species Number of Number of individuals in individuals in Ecosystem 1 Ecosystem 2 A 23 2 B 28 2 For Ecosystem 1: C 22 1 D 27 93 Total individuals in 100 98 Simpson’s D.I. = ecosystem 100 x (100 – 1) = 4.08 [23x(23-1)] + [28x(28-1)] + [22x(22-1)] + [27x(27-1)] = N (N – 1) where: N = total number of individuals Σ n (n – 1) and n = total numbers of individuals of each species
  • 6. Topic 2: The Ecosystem 2.3.5: Measuring Biodiversity The larger the number the greater the diversity
  • 7. Topic 2: The Ecosystem 2.3.5: Measuring Biodiversity So what about ecosystem 2? Species Number of individuals Number of individuals in Ecosystem 1 in Ecosystem 2 A 23 2 B 28 2 C 22 1 D 27 93 Total individuals in 100 98 ecosystem

Notas del editor

  1. title
  2. what is biodiversit this is one def from the International union for conservation of Nature
  3. simpsons fairly easy equation only has two components
  4. 100