Question

Wolves were reintroduced to yellowstone national park in 1995. They began to hunt the abundant elk population, so elk numbers decreased. The elk carcasses provided food for other predators, like foxes, coyotes, and bears, so all of their populations increased. Elk used to overgraze on willow plants; now that willows are growing back, beaver numbers are increasing, because they prefer the slow-moving water that willows cause. Which of these species is a keystone species?.

Answer 1

The species that can be classified as a keystone species is wolves.

What is a keystone species?

A keystone species refer to species that are essential in the ecosystem, and therefore, the increase or decrease in the population of this species has a great effect on the ecosystem.

What species is a keystone species?

Based on the description of the ecosystem, the wolf is the species that can be classified as a keystone species, due to the effects this species has on the ecosystem. The following are the most important effects:

• Wolves population regulates indirectly/directly the population of other species.
• Their reintroduction controlled and reduced the elk population.
• Their reintroduction increased the predators' population.
• Their introduction increased the beavers' population.

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