The reintroduction of wolves to Yellowstone National Park in 1995 demonstrates how apex predators maintain ecosystem balance through trophic cascades; when wolves were removed, elk populations exploded and overgrazed vegetation, destabilizing riverbanks and altering the landscape, but wolf reintroduction restored ecological equilibrium by controlling elk numbers and allowing vegetation to recover.
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How Wolves Changed Yellowstone ForeverAdded:
It's also one of the most important ecosystem in North America.
Large herds of bison move across open plains. Elk travel through valleys.
Wolves hunt in packs. Grizzly bears roam forests. [music] This is one of the few places where the ecosystem still functions in a natural way. Predators and prey, balance and competition. But this balance wasn't always stable.
For decades, wolves were removed from Yellowstone. And that created a chain reaction. Elk populations increased.
They overgrazed plants. Trees couldn't grow. Riverbanks became unstable. The landscape slowly changed. Then in 1995, wolves were reintroduced. And something unexpected happened.
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