Biotic Indices

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  • Biotic Indices
    • Disadvantages
      • Sorting the samples takes time
      • results difficult to interpret without correct training
      • indentification hard for inexperienced
    • Advantages
      • Monitor both current and past population
      • trace the source of the pollution
      • highly sensitive
      • bioaccumulation allow pollutants to be spotted at low levels
      • Cheaper than monitoring equipment
    • Good Indicator species
      • Easy to identify
      • Present if there is no pollution
      • Common if there is no polution
      • Widely distributed
      • Easy to find
    • Common indicator species
      • Lichen
        • Acid rain
        • Different species react differently to different concentration of sulphur dioxide
      • Aquatic invertiebrates
        • Aquatic Pollutants
  • Advantages
    • Monitor both current and past population
    • trace the source of the pollution
    • highly sensitive
    • bioaccumulation allow pollutants to be spotted at low levels
    • Cheaper than monitoring equipment

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