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IB Biology HL C4.1.4 Capture Mark Release Recapture Questions

Design and critique capture-mark-release-recapture studies for mobile populations, calculate Lincoln estimates and test assumptions about mixing, marks and population stability in IB Biology HL C4.1.4.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Carry out capture-mark-release-recapture: capture and mark a representative first sample without affecting survival, release it and allow thorough mixing before a second capture.
  • Count total and marked animals in the second sample and apply the Lincoln/Petersen estimate N = n₁ × n₂ / n₃, stating assumptions such as random mixing, stable marks, no migration and negligible births or deaths.

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

[Maximum number: 3]

The diagram shows levels of DDT, a pesticide, in an aquatic food web in Lake Kariba, Africa. Numbers represent ppm (parts per million) of DDT in fat tissue.

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

Outline how the population size of tilapia could be estimated.

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