What is the Lincoln-Peterson estimator?
The Lincoln-Peterson estimator is a statistical method used to estimate the size of a wildlife population using mark-recapture data. It assumes that the proportion of marked animals in the recapture sample represents the proportion of marked animals in the entire population. See also our calculate Extinction Risk.
What assumptions does the mark-recapture method require?
The method assumes: (1) the population is closed (no births, deaths, immigration, or emigration), (2) marks are not lost, (3) all animals have equal probability of capture, and (4) marking does not affect recapture probability.
How accurate is the population estimate?
Accuracy depends on sample size and how well the assumptions are met. Larger recapture samples generally provide more accurate estimates. The confidence intervals help indicate the reliability of the estimate.
What if I recapture no marked animals?
If R = 0, the Lincoln-Peterson estimator cannot be calculated as it would involve division by zero. This suggests either a very large population or violations of the method's assumptions.
Can this method be used for any animal species?
Yes, but it works best for species that can be safely captured, marked, and released without affecting their behavior or survival. It's commonly used for fish, birds, small mammals, and some insects.
What does capture probability tell me?
Capture probability indicates how likely an individual animal is to be caught in a sampling effort. Low capture probabilities may indicate the need for different sampling methods or longer sampling periods.