Lake Trout and Cutthroat Trout Dynamics

The video discusses the genetic isolation of Yellowstone Cutthroat trout due to the last ice age, forming a unique ecosystem. However, the invasive American lake trout threatens their existence, drastically reducing their numbers. Scientists track the lake trout's origins using ear bone analysis and GPS tagging, identifying spawning grounds. They employ electric pulses to control the trout population, offering hope for restoring Yellowstone's natural balance.

What event led to the genetic distinction of Yellowstone's Cutthroat trout?

• Human intervention

• Climate change

• Introduction of lake trout

• The last ice age

How many Cutthroat trout were passing through Clear Creek 20 years ago?

• 100

• 50,000

• 5,000

• 10,000

What is the primary threat to the Yellowstone Cutthroat trout?

• Habitat loss

• American lake trout

• Overfishing

• Pollution

How many Cutthroat trout can a single lake trout consume in a year?

• 10

• 20

• 30

• 40

What method did scientists use to determine the age and origin of lake trout?

• DNA analysis

• Water testing

• Tagging

• Ear bone sampling

What technology did biologists use to track lake trout?

• Sonar

• GPS transmitters

• Radio collars

• Satellite imaging

Where did researchers find a major spawning ground for lake trout?

• Yellowstone River

• Lake Michigan

• Carrington Island

• Clear Creek

What method is used to control the lake trout population?

• Netting

• Chemical treatment

• Electric pulses

• Fishing

What is the hopeful outcome mentioned in the final section?

• Introduction of new species

• Complete eradication of lake trout

• Increase in tourism

• Restoration of Yellowstone's ecosystem

What is the significance of the declining lake trout numbers?

• It means more food for other species

• It shows a decrease in water pollution

• It suggests a recovering ecosystem

• It indicates a successful fishing season