Investing populations

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  • Created by: Laura
  • Created on: 06-07-13 18:02


Total Population size =

(no. caught in 1st sample* no. caught in 2nd sample) / No. marked in 2nd sample

  • Capture a sample and mark them in some way 
  • Release them back where you found them
  • Wait a week, take a second sample
  • Count how many of the second sample are marked
  • Use the equation to estimate total population size 

Depends on some assumptions:

  • That the marked sample has time to mix back in with the population
  • That the marking hasn't affected the individual (survival chance) and…


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