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  • Describe basic processes that affect population density.

Describe basic processes that affect population density.

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Population density can be described as the total number of individuals per unit area.

These four are the basic processes that affect population density:

  1. Natality (Birth Rate - B): The total number of births within a given population within a certain time frame. Denser populations are the result of higher birth rates.

  2. Mortality (Death Rate - D): The number of individuals that die in a population over a specific period. Higher mortality reduces population density.

  3. Immigration (I): A population's size increases as new members arrive from different parts of the world. The density of a population is increased via immigration.

  4. Emigration (E): The movement of individuals out of a population to other areas. Emigration decreases population density.

These four factors are used in the population density formula:

Nt+1=Nt+[(B+I)−(D+E)}

where Nt is the population at a given time.

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