Lincoln+Index

The Lincoln Index provides a way to measure population sizes of individual animal species. It is based on a capture /mark / recapture method.  In theory, mark / recapture techniques involves sampling a population of animals and then marking all of the individuals captured in a recognizable way. The marked animals are then released back into the population and left to mingle for a suitable period of time. Once they have become mixed into the population again, the population is resampled. The formula for expressing this is the following: **
 * n1xn2/ n3
 * n1 ||  **number of animals first marked and released.umber of animals first marked and released.**  ||
 * n2 || **number of animals captured in the second sample** ||
 * n3 || **number of marked animals in the second sample** ||