Trophic Cascade 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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NGSS.MS-LS2-1

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Grizzly bears compete with elk for berries.

• True

• False

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Which ecological problem was NOT caused by elk?

• Few trees were on river banks

• Small mammals couldn't hide from predators due to less grass and shrub cover.

• Weather patterns changed and there were more severe storms.

• Rivers were muddy, making it harder for fish and amphibians to survive.

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NGSS.MS-LS2-1

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

• True

• False

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NGSS.MS-LS2-4

Wolves and elk sometimes hunt together for the same prey.

• True

• False

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NGSS.MS-LS2-2

Grizzly bears are best described as

• producers

• herbivores

• carnivores

• omnivores

Which does NOT represent a food chain in Yellowstone National Park?

• grasses --> elk --> wolves

• grasses --> elk --> eagles

• berry bushes --> elk --> bears

• berry bushes --> elk --> rabbits

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NGSS.MS-LS2-3

Why was the songbird population reduced by the presence of too many elk in Yellowstone?

• Elk ate young trees, so birds had fewer places to nest.

• Elk ate too many songbirds.

• Wolves at songbirds when no elk were available.

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NGSS.MS-LS2-1

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Yellowstone elk made hunting easier for foxes by

• hunting with them.

• eating the tall grasses that small mammals used to hide.

• chasing the wolves out of the park.

• eating only small trees.

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NGSS.MS-LS2-1

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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

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-2