During a summer with lots of rain, the vegetation grew lush and the white-footed mouse populations increased due to increases in food availability. However, the next two summers were record drought years and food became increasingly scarce. Over these two years, the population size of the mice decreased due to increased competition for access to food. This increased competition is an example of

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The increased competition for food among the white-footed mice as their population size decreased due to scarcity of resources is an example of a density-dependent factor. Density-dependent factors are those that affect the population based on its size, such as competition for resources, which becomes more intense as the population grows or resources become scarce.

During a Summer with Lots of Rain, the Vegetation Grew