An ecologist wants to estimate the size of a population of woodlice in a small section of a woodland.
She catches a sample of woodlice, marks them with a small dot of non-toxic paint, and then releases them back into their habitat. A few days later, she captures another sample and counts how many of them are marked.
What is the name of the method she is using?
Systematic sampling
Belt transect
Capture-recapture
Random quadrat sampling