A
population is a summation of all the organisms of the same group or
species, who live in the same
geographical area, and have the capability of interbreeding. In ecology the population of a certain species in a certain area is estimated using the
Lincoln Index. The area that is used to define a
sexual population is defined as the area where
inter-breeding is potentially possible between any pair within the area. The probability of interbreeding is greater than the probability of cross-breeding with individuals from other areas. Under normal conditions, breeding is substantially more common within the area than across the border.
In
sociology, population refers to a collection of
human beings.
Demography is a
social science which entails the statistical study of human populations. This article refers mainly to human population.