Which of the following is a classic density-dependent factor?

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Prepare for the Ecology and Ecosystems QBA Exam 1. Study with flashcards and multiple choice questions, each question comes with hints and explanations. Ace your exam!

Multiple Choice

Which of the following is a classic density-dependent factor?

Explanation:
Density-dependent factors change in impact as population density changes. Predation fits this pattern because when prey are abundant, predators have more opportunities to hunt, so predation pressure is higher and more individuals may be removed. As prey numbers drop, encounters become rarer and predation pressure decreases, helping regulate the population. This feedback aligns with how predation acts as a density-dependent control. In contrast, events like forest fires, hurricanes, or typical weather affect populations regardless of how many individuals are present; their impact does not scale with density, making them density-independent factors.

Density-dependent factors change in impact as population density changes. Predation fits this pattern because when prey are abundant, predators have more opportunities to hunt, so predation pressure is higher and more individuals may be removed. As prey numbers drop, encounters become rarer and predation pressure decreases, helping regulate the population. This feedback aligns with how predation acts as a density-dependent control.

In contrast, events like forest fires, hurricanes, or typical weather affect populations regardless of how many individuals are present; their impact does not scale with density, making them density-independent factors.

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