Trophic Cascade: Yellowstone

What population was hunted to extinction in Yellowstone National Park?

• Bears

• Coyotes

• Deer

• Wolves

What conservation technique was used to recovery the population of wolves in 1995?

• Reintroduction

• Reincarnation

• Captive Breeding

How many wolf packs formed from the new wolves in the late 1990's?

• 0-5

• 5-10

• 50+

Who is the tertiary consumer in the Yellowstone Ecosystem?

• Wolves

• Coyotes

• Deer

• Aspen Trees

Who is the keystone species of the Yellowstone Ecosystem?

• Wolves

• Coyotes

• Deer

• Aspen Trees

Who is the primary consumer in the Yellowstone Ecosystem?

• Wolves

• Coyotes

• Deer

• Aspen Trees

How did the river landscape change 1950-1990?

• rivers had strong edges, low erosion, and high flow

• rivers had weak edges, high erosion, and low flow

After 1995, how did the river landscape change?

• rivers had strong edges, low erosion, and high flow

• rivers had weak edges, high erosion, and low flow

What caused the rivers to improve after 1995?

choose all that apply

• lower deer/elk population

• more beavers to establish river structures

• greater tree populations

• less erosion

More Trees means...

• less erosion of soil

• more erosion of soil