A-LEVEL BIOLOGY AQA NOTES 
biodiversity within a community

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Biodiversity
  • Biodiversity is the variety of organisms in an area. It can be considered on a local or global scale.
  • Species richness is a measure of the number of different species in a community.
  • An index of diversity measure biodiversity taking into account species richness and the number of individuals in each species
  • Index of diversity = 
N = total number of organisms of all species
n = total number of organisms of each species
  • Farming techniques reduce biodiversity. E.g. monoculture, use of herbicide & pesticides, hedgerow removal and woodland clearance
  • Conservationists protect biodiversity with methods such as: giving endangered species legal protection, creating protected area & The Environmental Stewardship Scheme.
  • A balance between conservation and agriculture is needed