Sustainable Man – How Wolves Change Rivers
Sustainable Man – How Wolves Change Rivers
The Accurate Source To Find Transcript To Sustainable Man – How Wolves Change Rivers.”
[Sustainable Man – How Wolves Change Rivers]
[Voice Over – Sustainable Man]
One of the most exciting scientific findings of the past half century has been the discovery of widespread trophic cascades. A trophic cascade is an ecological process which 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 vegitation 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.
First, of course, they killed some of the deer but that wasn’t the major thing. Much more significantly, they radically changed the behavior of the deer. The deer started avoiding certain parts of the park – the places where they could be trapped most easily – particularly the valleys and the gorges and immediately those places started to regenerate. In some areas, the height of the trees quintupled in just six years. Bare valley sides quickly became forests of aspen and willow and cottonwood. And as soon as that happened, the birds started moving in. The number of songbirds and migratory birds started to increase greatly. The number of beavers started to increase because beavers like to eat the trees. And beavers, like wolves, are ecosystem engineers. They create niches for other species. And the dams they built in the rivers provided habitats for otters and muscrats and ducks and fish and reptiles and amphibians. The wolves killed coyotes and as a result of that, the number rabbits and mice began to rise which meant more hawks more weasels more foxes more badgers. Ravens and bald eagles came down to feed on the carrion that the wolves had left. Bears fed on it, too. And their population began to rise as well partly also because there were more berries growing on the regenerating shrubs. And the bears reinforced the impact of the wolves by killing some of the calves of the deer.
But here’s where it gets really interesting.
The wolves changed the behavior of the rivers. They began to meander less. There was less erosion. The channels narrowed. More pools formed. More riffle sections. All of which were great for wildlife habitats. The rivers changed in response to the wolves. And the reason was that the regenerating forests stabilized the banks so that they collapsed less often. So the rivers became more fixed in their course.
Similarly, by driving the deer out of some places, and the vegitation recovering on the valley side, there was less soil erosion because the vegitation stabilized that as well. So the wolves, small in number, transformed not just the ecosystem of the Yellowstone National Park – This huge area of land… but also, its physical geography.
Visit and connect with Sustainable Man here:
Sustainable Man – How Wolves Change Rivers. The rivers changed in response to the wolves. Sustainable Man Transcript, Dialogue, Remarks, Saying, Quotes, Words And Text.
Trending Now AROUND THE WEB
- Viola Davis – SAG Awards Acceptance Speech 2015
- ULTRAVIOLET – Domestic Violence Out Of Football
- Barack Obama – Protecting The Arctic National Wildlife Refuge
- The Gates Notes – Increasing African Corn Yield
- The Gates Notes – Access To Mobile Money Bank Accounts
- The Gates Notes – We Can Eradicate Four Diseases By 2030
- The Gates Notes – Neil deGrasse Tyson: What’s Possible In 15 Years
- Neymar Jr. Hypervenom Liquid Diamond
- Josh Gad Impersonates Jenifer Lewis On Set Of The Wedding Ringer
- Octopus Intelligence
- Young Jack To Neil DeGrasse Tyson: What’s the Meaning Of Life
- Jennifer Lawrence Presenting At Producers Guild Awards
- Lauren Wood – Tech Doesn’t Appreciate Snow Art
- J.Cyrus Chrish Is Your Spirit Animal
- Klarity When Your Homie Betrays Your Trust
- Anna Clendening He’s Already A Stud
- Wahlid Mohammad I’m Dating Your Dad
- Get You Get You Drunk
- Trey Kennedy We All Thought Our Night Lights Kept Us Safe As A Kid
- Chrish But I’ll Remain Pretty
- Brandon Bowen NO JUNK FOOD
- LiveLikeDavis I DIED
Tags: Complete, Dialogue, How Wolves Change Rivers, Manuscript, Quotes, Read, Read Education News, Read Sustainable Living, Read The Sustainable Animals News, Read Transcription, Read Transcripts, Remarks, Saying, Script, Sustainable Man, Sustainable Man How Wolves Change Rivers, Sustainable Man How Wolves Change Rivers Quotes, Sustainable Man How Wolves Change Rivers Read, Sustainable Man How Wolves Change Rivers Transcription, Sustainable Man How Wolves Change Rivers Words, Sustainable Man Quotes, Sustainable Park Videos, Text, Transcripts, Video, Webcam, Words.