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Capture, Mark & Recapture

Capture, Mark & Recapture. Populations Estimates AP Environmental Science. C-M-R. How do we estimate the number of animals out there? Elk? Wolves?. Lincoln-Petersen Technique. 1. Capture animals and mark all that you caught 2. Release these animals

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Capture, Mark & Recapture

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  1. Capture, Mark & Recapture Populations Estimates AP Environmental Science

  2. C-M-R • How do we estimate the number of animals out there? Elk? Wolves?

  3. Lincoln-Petersen Technique • 1. Capture animals and mark all that you caught • 2. Release these animals • 3. Capture again and count the number of marked animals.

  4. What do we need to capture and mark animals • Think….How are fish caught? How are they marked or tagged? How are birds caught? Marked?

  5. Male vs Female Female Male Large Ovipositor

  6. Lincoln Petersen Model • Population Estimation n1 = m2orN= n1 x n2 N n2 m2 Closed model (meaning that population is constant during the time of experiment.)

  7. Variables Identified • N = estimate of population size • n1 = # of animals marked and released first time • n2=# of animals captured second time • m2=# animals with marks at the 2nd session.

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