Mark and Recapture Lab p. 139

One method for estimating animal populations is known as mark-recapture sampling.

Estimating the population size of an animal population can be important in managing a natural area to see if the population is approaching the carrying capacity of the area.

Carrying capacity: maximum number of individuals of a species that a habitat can support.

For example, we may use traps to capture a particular species of voles. After capture, each vole is marked and released.

After a certain amount of time, the traps are reset to catch another sample of voles. Some of the voles in this second group will be new individuals not caught in the first group, but some may be marked individuals from the first trapping.

We can represent the vole numbers as follows: p. 140

Assuming the captured animals are a random sample of the whole population, N/T should equal n/t:
the ratio of the total number of voles to the total number of marked voles is equal to the ratio of the number of voles in the 2nd sample to the number of recaptured voles.
N/T = n/t
N = (T)(n) / t


N = * /

N=, A=: error%

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