Biodiversity and Sampling

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  • Biodiversity
    • Sampling
      • Plants
        • Quadrat
          • Use abundance scale to measure abundance of a species
          • Use point frame - any plant touching s point counts as a %.  If 100 points then 1 plant = 1%
          • Estimate % cover although usually underestimated
        • Transect
          • Continuous belt transect
            • Quadrat moves along the line
          • Interrupted belt transect
            • Record plants touching line at set intervals
      • Animals
        • Knock on branches of a tree to remove insects etc
        • A pitfall trap - container buried in the ground
        • A light trap
        • A Tullgren funnel
        • Sweep net - pull net through low lying vegetation - empty contents onto white sheet
        • Studying animals is hard because they move around
      • Must make sure a sensible number of samples are taken
      • Importance = to know how human behaviours are effecting biodiversity
      • Must be random - 1) take samples at regular intervals across habitat 2) use random numbers to plot coordinates
    • Currently estimated to be 1.8million species in the world
    • Species: a group of organisms that interbreed to form viable offspring
    • Habitat: the place where an organism or population lives.  It includes the climate, topographic and edaphic factors as well as the plants and animals that live there
    • Biodiversity: the number and variety of living things to be found in the world, in an ecosystem or in a habitat


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