NUMBAT OER - Open Educational Resources

3. Assumptions

In describing this method, we have already noted several assumptions. Most importantly, the marked and unmarked animals must have equal chances of being captured, and after capture the marked animals must intermix with the rest of the population. Strongly territorial animals might not be suitable candidates for this method if the sampling method made it more likely that marked animals would be recaptured than unmarked.

Further assumptions include a closed population (no immigration or emigration within the period of study) and a stable population (no births or deaths within the period of study). The marking applied to the animals must remain in place over the period of the experiment, and must not adversely affect the survival of the marked animals.