How Wolves Change Rivers [REMASTERED HD] - George Monbiot

Embark on a journey to Yellowstone, where a few wolves did not just roam, but rewrote the rules of an entire ecosystem. Discover how these majestic predators triggered a cascade of life, transforming not only the park's wildlife but its very rivers and landscapes. It's a story of how nature's architects can reshape our world in ways we never imagined.

This video went viral nearly 10 years ago and has been used in countless classrooms and museums around the world to teach people the value that every species brings to an ecosystem. We decided to update the video using HD footage. Re-experience the magic of wolves!

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0:00 - What is a trophic cascade?
0:45 - Conditions of Yellowstone National Park before reintroduction
1:01 - How wolves changed behavior of animals in the park
1:26 - How the changed behavior helped nature to regenerate
2:43 - How wolves change the course of the rivers

Transcript:

One of the most exciting scientific findings of the past half-century has been the discovery of widespread trophic cascades. Atrophic cascade is an ecological process that starts at the top of the food chain and tumbles all the way down to the bottom.

And the classic example is what happened in the Yellowstone National Park in the United States when wolves were reintroduced in 1995. Now, we – we all know that wolves kill various species of animals, but perhaps we’re slightly less aware that they give life to many others. Before the wolves turned up – they’d been absent for 70 years – the numbers of deer (because there had been nothing to hunt them) had built up and built up in the Yellowstone Park and despite efforts by humans to control them they’d managed to reduce much the vegetation there to almost nothing. They had just grazed it away.

But as soon as the wolves arrived, even though they were few in number they started to have the most remarkable effects.

#HowWolvesChangeRivers #YellowstoneNationalPark #TrophicCascades

Keep reading: https://www.sustainablehuman.org/stories/how-wolves-change-rivers/#Transcript

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