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IB Biology SL C4.1.4 Capture Mark Release Recapture Questions

Capture, mark, release and recapture animals, then use marked and total counts to estimate population size with the Lincoln index in IB Biology SL C4.1.4.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Describe capture-mark-release-recapture by capturing and marking a sample, allowing it to mix with the population, then capturing a second sample and counting marked individuals.
  • Apply the Lincoln index to estimate population size from the first capture, second sample and number of marked individuals recaptured.

IB Biology SL C4.1.4 Capture Mark Release Recapture Questions question 1

[Maximum number: 3]

The image shows a castor bean tick (Ixodes ricinus) which is commonly found in woodlands or forest areas. This tick can carry bacteria that cause Lyme disease in humans.

Figure for Question IB Biology SL C4.1.4 Capture Mark Release Recapture Questions question 1 — IB Biology SL

Explain how the capture-mark-release-recapture method could be used to estimate the size of a tick population.

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