First slide

Populations

Question

Which of the following correctly describes the impact of a population attribute on population density?

Moderate

A

Mortality contributes to increase in population density.
B

Natality contributes to decrease in population density.
C

Immigration contributes to an increase in population density.
D

Emigration contributes to an increase in population density.

Solution

Immigration is the number of individuals of the same species that have come into the habitat from elsewhere during the time period under consideration. So, it increases the population density.
Population density fluctuates due to changes in four basic processes, two of which (natality and immigration) contribute to an increase in population density and two (mortality and emigration) to a decrease.

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