C4.1.4—Capture-mark-release-recapture Topic Practice
C4.1.4—Capture-mark-release-recapture Topic Practice

IB Biology syllabusBiology SL/HLFirst assessment 2025
Practise capture-mark-release-recapture methods for mobile animals, including marking, mixing, recapture counts and Lincoln index estimates.
How this is tested
- explain how a first captured sample is marked, released and allowed to mix
- apply the Lincoln index to recapture data to estimate population size
- identify limitations, including marking effects, sample size and movement between samples
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