Wolves of Yellowstone

Why were wolves absent from Yellowstone from the 1920's to 1995?

• There was no prey available, so they starved.

• When all the elk died, the wolves moved to Canada.

• Humans hunted and killed all the wolves in Yellowstone and the surrounding area.

• The wolves migrated south to Texas for a warmer climate.

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What year were wolves introduced back into Yellowstone Park?

• 1994

• 1995

• 2000

• 2002

• 2005

Wolves keep elk moving so they don't damage rivers.

• True

• False

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Other species that feed from an elk killed by wolves include

• foxes, rabbits, and mice

• bears, foxes, and beavers

• bears, eagles, and coyotes

• beavers, rabbits, and mice

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How did the reintroduction of grey wolves affect the elk population in Yellowstone?

• The elk population increased significantly.

• The elk population remained the same.

• The elk population decreased.

• The elk population became extinct.

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If there was a major drought at Yellowstone causing many plant species to die, the following would happen:

• the elk and wolf populations would go down

• the elk and wolf populations would go up

• the elk population would go up; the wolf population down

• the elk population would go down, the wolf population up

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How can the removal of an apex predator affect the populations at the trophic level below?

• It can decrease the abundance of the prey's prey

• It has no effect on the trophic levels below

• It can increase the abundance of the prey's prey

• It can only affect the same trophic level

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What is a keystone species?

• A species that eats the shoots, leaves, and twigs of trees or shrubs

• A species that has a disproportionately large effect on its environment compared to its relative abundance

• An organism that feeds on grass

• A top-level predator with no natural predator of their own

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What is a trophic cascade?

• The act of eating shoots, leaves, and twigs of trees or shrubs

• The home or environment of a plant, animal, or other organism

• A process that occurs when the impact of a predator on its prey affects one or more feeding or trophic level

• An organism that feeds on grass

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What were the effects of reintroducing the wolves back to Yellowstone National Park?

• The deer started to die out and became endangered

• The wolves started to die out and become endangered

• The ecosystem balanced itself with a healthy predator-prey relationship

• The ecosystem was unbalanced

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