Biodiversity within a community

• Species diverstity


  - the number of different species and the number of individuals within each species in a community
• Species richness


  - the number of different species in a particular area at the same time
• Index of diversity


  - a measure of species diversity

  - a calculation to measure the relationship between the number of species in a community and the number of individuals in each species
• Community


  - all the species in a particular area at a particular time
• Environment


  - the abiotic (non-living) factors in an area
• Habitat


  - The range of physical, biological and environmental factors in which a species can live
• Which farming techniques reduce biodiversity?

  - destruction of hedgerows

  - selective breeding

  - monocultures

  - over-grazing

  - filling in ponds and draining wetlands
• Biodiversity


  - a measure of the range of habitats

  - from a small local habitat to the entire Earth

  - a measure of species diversity

  - a measure of genetic diversity
• Formula for Index of Diversity


  d = N(N-1)/∑n(n-1)

  
  

  N = total number of organisms of all species

  n = number of organisms in a single species