The assumptions made when using the mark-release-recapture method
The mark-release-recapture method only gives an accurate population estimate if certain conditions hold true. These conditions are the assumptions scientists must accept when using this technique.
Formula
Estimated population = (n₁ × n₂) ÷ n₃
Real World
When researchers mark butterflies with a dot of paint on their wing, they must ensure the paint doesn't make them more visible to bird predators — otherwise marked individuals are eaten more, inflating the population estimate.
Exam Focus
List all five assumptions and for each state what happens to the estimate (over or under) if it is violated.
Evaluation Scaffold
A four-step framework for high-quality evaluation. Use this for 'assess', 'evaluate', and 'to what extent' questions.
How well did you know this?