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Measuring Biodiversity

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Measuring Biodiversity

  1. 1. Topic 2: The Ecosystem 2.3.5: Measuring Biodiversity Simpson’s Index
  2. 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. 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. 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. 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. 6. Topic 2: The Ecosystem 2.3.5: Measuring Biodiversity The larger the number the greater the diversity
  7. 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

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