Natality, mortality, immigration and emigration affects population density.
What is population density?
- It is defined as the number of organisms in a given habitat during a given period of time.
- The factors that influences it include: food availability, weather and predation.
- Population density increases during natality and immigration (number of same species in a habitat that comes from somewhere else) whereas it decreases during mortality and emigration (number of same species leaving a habitat).
What is natality?
- It is the rate of birth at given period.
- It increases the population density.
What is mortality?
- It is the rate of death at given time.
- It decreases the population density.
Hence, the population density is affected by immigration, natality, mortality and emigration.
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