Which of the following is an example of a density-dependent...

Which of the following is an example of a density-dependent effect on population growth?
a. An extremely cold winter
b. A tornado
c. An extremely hot summer in which cool burrow retreats are fewer than number of individuals in the population
d. A drought

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Key Concepts

Density-Dependent Regulation

This concept refers to factors affecting a population that have effects that vary with the population density. When an environmental factor becomes more intense as the population increases, such as competition for limited resources, accumulation of waste, or increase in disease transmission, it represents a density-dependent effect that can slow down population growth.

Density-Independent Regulation

This concept involves factors that affect population size regardless of the population density. Environmental events such as severe weather, natural disasters, or other abiotic factors impact individuals in a population irrespective of how many individuals there are, and thus are classified as density-independent effects.

Population Growth

This is the change in the number of individuals in a population over time, influenced by factors like birth rates, death rates, immigration, and emigration. Understanding both density-dependent and density-independent effects is essential to studying how populations increase or decrease in ecological contexts.

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