biodiversity

• species richness is the number of different species in an area at a particular time
• farming practises that reduce biodiversity

  1. destruction of hedgrows
  2. selective breeding
  3. monocultures
  4. over-grazing
  5. filling in ponds and draining wetlands
• index of diversity is a measure of species diversity measuring the number of species and the number of individuals in each species
• index of diversity is between 1-10
• N = total number of organisms of all species

  n = total number of organisms of a particular species

  D = simpsons diversity index