Measuring the distribution of organisms

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  • Measuring the distributions of organisms
    • Quadrat
      • This is a form of random quantitative sampling
      • A quadrat is a square frame made of metal or wood which may be subdivided into a grid.
      • If several quadrats are placed randomly in a field you can count the number of particular species in each quadrat.
        • This can conclude an estimate of that organism in that environment.
      • Sample size is important. In a large field there must be enough quadrats to represent the whole area.
      • An estimate is given of the organisms per square metre.
    • Transect
      • A transect is not random.
      • A line is marked between two points.
      • A quadrat can be placed every 5 metres along the line and the organisms counted.
      • Physical factors can be measured at each quadrat point.
        • This gives information on the habitat and the organisms in it.


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