Wolves have taken over a Marine Ecosystem

What animal did Alaskan gray wolves start eating on Pleasant Island?

• Squirrels

• Beavers

• Sea Otters

• Deer

Why are sea otters considered apex predators?

• Because they eat large mammals

• Because they have no natural predators

• Because they control the sea urchin population

• Because they are the largest otters

What happened to the deer population on Pleasant Island after the wolves arrived?

• It remained stable

• It migrated to another island

• It increased due to better ecosystem management

• It nearly got wiped out

What ecosystem role do sea urchins play?

• They provide food for sea otters

• They eat kelp and can destroy kelp forests if unchecked

• They build structures that fish and birds use

• They control the wolf population

What was the effect of reintroducing wolves to Yellowstone National Park?

• The deer population increased

• The local ecosystem was damaged further

• Sea otters were introduced to the park

• The beaver population recovered

Why were sea otters nearly wiped out from the North Pacific?

• Lack of food

• Because of pollution and hunting

• Due to a disease

• Climate change

What change occurred in the wolves' diet from 2015 to 2017 on Pleasant Island?

• They ate more sea otters

• They began eating plants

• They stopped eating deer entirely

• Deer went from 90% to less than 1% of their diet

How many adult sea otters do the wolves need to eat a year to maintain their population?

• Exactly 8,000

• Around 90

• More than 100

• About 50

What is a major reason wolves and sea otters had not been observed interacting before?

• Wolves are afraid of water

• Sea otters were in decline for a long time

• Researchers were not interested

• Wolves do not eat sea otters

What is the significance of the wolves' diet on Pleasant Island?

• It indicates a return to ancient dietary habits

• It proves wolves prefer sea otters over deer

• It demonstrates the failure of ecosystem management

• It shows wolves can adapt to marine food sources