The factors that stimulate an increase in the population size may include the birth rate and migration into the population or immigration.
The factors that stimulate a decrease in the population size may include the death rate and migration out of the population or emigration.
What is the population size?
The population size may be defined as the number of organisms of the same species that are found within a given habitat. The population size of organisms in a habitat area is affected by the following factors:
- Birth rate: An increase in births results in an increase in population size whereas a decrease in births results in a decrease in population size.
- Death rate: An increase in deaths results in a decrease in population size whereas a decrease in deaths results in an increase in population size.
- Migration: migration into a habitat results in an increase in population size while migration out of a habitat results in a decrease in population size
Therefore, the factors for increasing or decreasing the population size are well described above.
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