Population: The group of particular species occupying a particular place at any specific time is called the population of that place. At any particular place and time, the sum total of the number of such members of a group of organisms which possess similar heredity and are capable of maintaining the continuity of species by exchange hereditary characters through reproduction is called population.
Main affecting factors:
(1) Population size and density.
(2) Dispersion.
(3) Natality.
(4) Mortality.
(5) Age distribution.
(6) Biotic potential.