Distribution and Abundance

• Quadrat Sampling

  Procedure:

  • Step 1: Lay out a grid over the study area.
  • Step 2: Randomly or systematically place quadrats (square frames of a known area) within the grid.
  • Step 3: Count the number of individuals of the species of interest within each quadrat.
  • Step 4: Calculate the average number per quadrat and multiply by the total number of quadrats to estimate the total population.
• You place quadrats at random co-ordinates on a grid to prevent bias.
• Average numb. of species in area= Total area of grid/total area one quadrat X number of species
• Transect Sampling

  1. Choose the Study Area

  2. Determine the Transect Line

  3. Set Up the Transect Line

  4. Mark Sampling Points

  5. Place Quadrats

  6. Record Data