Multiple Choice
In population ecology, which expression correctly calculates population density for a species in a defined area?
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50. Population Ecology
Introduction to Population Ecology
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In introductory population ecology, which expression correctly calculates population density for a defined area or volume?
A
Population density equals the area or volume divided by the number of individuals.
B
Population density equals the number of individuals divided by the area or volume they occupy.
C
Population density equals the number of individuals multiplied by the area or volume they occupy.
D
Population density equals the number of births minus the number of deaths in the population.
Verified step by step guidance1
Understand that population density is a measure of how many individuals of a species are found within a specific unit of space, such as an area (for terrestrial organisms) or a volume (for aquatic or airborne organisms).
Recall the general formula for population density, which is the number of individuals divided by the space they occupy, because density reflects concentration per unit space.
Express this relationship mathematically as: \(\text{Population Density} = \frac{\text{Number of Individuals}}{\text{Area or Volume}}\).
Recognize that the other options are incorrect because dividing area by individuals would give an inverse measure, multiplying individuals by area or volume does not represent density, and births minus deaths relates to population growth, not density.
Conclude that the correct expression for population density is the number of individuals divided by the area or volume they occupy.
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