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Sampling

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Transcript

  • 1. Population Sampling
  • 2. Measuring Population Size• Census (count EVERYTHING?!?!)• Sampling – Lincoln Index (capture, tag, recapture) – Quadrat (count in a small sample area, apply to entire area)
  • 3. Lincoln Indexpopulation size = (n1 X n2)/n3where . . .• n1= number of individuals initially caught, marked and released• n2 = total number of individuals caught in the second sample• n3 = number of marked individuals in the second sample
  • 4. Quadrat Method• Random sampling of plant species usually involves counting numbers in small, randomly located, squares within the total area.• These squares are usually marked with frames called quadrats.
  • 5. Quadrat Method• Mark out gridlines along two edges of the area• Use a calculator or tables to generate two random numbers to be used as coordinates. Place a quadrat at the coordinatesExample: 14, 31
  • 6. Quadrat Method1. Count how many individuals are inside the quadrat.2. Repeat steps 2 and 3 as many times as possible.
  • 7. Quadrat Method1. Measure the total size of the area occupied by the population, in square meters
  • 8. Quadrat Method1. calculate the mean number of plants per quadrat. Then calculate the population size using the following equation: Population = (quadrat mean X total area) quadrat area

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