Question

What are the decisive factors for population density?

Answer 1

The density of a population in a given habitat during a given period fluctuates due to changes in four basic processes, viz

1. Natality i.e. birth rate (the number of births in a particular population during a given period that are added to the initial density).
2. Mortality i.e. death rate (the number of people who died in a certain period).
3. Immigration i.e. the number of individuals of the same species who arrived in the habitat from elsewhere during the time period in question
4. Emigration Specifically, the number of individuals in the population who left their environment and went elsewhere during the time period under examination.
5. Natality and immigration increase in population density whereas mortality and emigration decrease it.