Population Characteristics. A population is a group of individuals of the same species living in the same geographical area, and usually able to breed together. The study of human populations is called demography . The study of the other organisms populations is population ecology .
The fur seal population of St. Paul Island, off the coast of Alaska, has experienced dramatic fluctuations.
What are some challenges in counting this population?
Individuals are added through births and immigration.
Individuals are removed through death and emigration.