What do gray wolves, elephants, and parrotfish have in common? They're all keystone species, which means they have an especially large impact on their habitat. SciShow explores how these animals keep their ecosystems running.
Hosted by: Olivia Gordon
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"The wolves changed Yellowstone in large and often surprising ways, right down to how the rivers flow."
So you're saying the Secwépemc story of a coyote redirecting rivers wasn't that farfetched after all?
Look, I'm not even a biologist and I know this. We want ruminants to eat plants of the Populus genus.These plants fix nitrogen. We need plants that don't fix nitrogen on river banks. Most rivers typically have agricultural run off. The rivers do not need more nitrogen.Maybe what you need is a way to protect the plants until their leaves are out of reach. But that wouldn't look as pretty or natural.
Very interesting, but STOP BOUNCING, ...
"Nor do not saw the air too much with your hand, thus, by use all gently, for in the very torrent, tempest, and (as I may say) whirlwind of your passion, you must acquire and beget a temperance that may give it smoothness."
half a video dedicated to yellowstone wolfe, something is well known to the common people for years, what happen to this channel, guys come on what is it you are getting too big and you have deadline to respect no matter what, this channel use to be awesome
A serious word of advice for this presenter: quit forcing your hand gestures. Your hands don't have to move with every single word you say with the same exact gesture for everything. Your hands just bounce around. It looks so unnatural and is off-putting. It's very gross. Let the gesturing come naturally. You look silly, otherwise.
Yes. Although we've certainly had negative effects on many ecosystems, there are others (temperate forests in Eurasia, tallgrass prairie and I think terra preta in the Americas) that have adapted to benefit from our "management." For a more modern example, there are a lot of species--native and introduced--that live at high densities in human-altered agricultural or suburban areas: deer, corvids, blackbirds, mesopredators like skunks and raccoons...
Now the big question: is this a good or a bad thing? I really don't know if there's an answer to that.
In some cases, yes. Despite what a lot of nihilists like to say, there are many ecosystems that Humans are very vital to. We may not be living in those ecosystems in the way other species do, but our contributions to those ecosystems are often vital in keeping balance
Humans absolutely have the power to be a keystone species - After all, we have the power to create vast artificial habitats. Whether we are, however, is debatable. Many animals thrive in cities, but equally, animals suffer from loss of habitat, pollution, and the like. If we allowed or even placed more plant life in cities and made them more accessible to animals, we would certainly become a vital keystone species. But, that's up to us to actually do.
I am sorry, I've said it before in connection with the only other video I had STARTED to watch presented by this young woman--and it was one I REALLY wanted to watch, the History of Computers--they are unwatchable. It is NOT a sexist thing--your other women presenters are great. It's the freaking hands--she's miming the punctuation and rhythms of every sentence. It's better this time--someone has obviously spoken to her--but it's still annoying as hell.
Ok the elephant i dont know if it's a keystone species the entire idea is that they have a impact disproportionate to there size elephants are huge you expect them to have a big impact the wolves maybe but that is iffy also
We are supporting and suffering violence (in a natural habitat) because it's natural. Nature is a lot of violence and suffering that you cannot reduce, without tipping it off balance. Do we accept and support this status quo? What if humans are supposed to unwillingly cause the end of life, which will very likely make them extinct too, but will remove all pain and suffering from this planet. Or willingly - would that be an ultimate sacrifice? I'm not supporting this kind of world view, but it makes horrid sense.
Sorry if you feel down, let's go watch some "it's a beautiful world" uplifting video and numb our consciousness...
One small detail they left out: The wolves in Yellowstone were killed ON PURPOSE by the environmentalists of the day. They thought they were doing the right thing by removing the predators, protecting the environment. They genuinely believed they were doing the right thing. But they had no clue what the consequences of their actions would be.
Makes me wonder what, today, people are doing in the name of "protecting the environment" that will wind up having negative consequences...
What you didnt mention is that parrotfish droppings are sand. They cant digest the coral they ingest so they excrete the white sand which makes up the beautiful coral beaches. This makes them vital for the species that rely on the beaches, including tourists who visit the beaches, and also for the tourism related income
From least greatest (10) to greatest greatest (1), the poems in this list are limited to ones originally written in the English language and which are under 50 lines, excluding poems like Homer’s Iliad and Edgar Allan Poe’s “Raven.” Each poem is followed by some brief analysis. Many good poems and poets had to be left off of this list. In the comments section below, feel free to make additions or construct your own lists. You can also submit analyses of classic poetry to [email protected] They will be considered for publication on this website.
10. “The Road Not Taken” by Robert Frost (1874-1963)
Two roads diverged in a yellow wood, And sorry I could not travel both And be one traveler, long I stood And looked down one as far as I could To where it bent in the undergrowth;
Then took the other, as just as fair, And having perhaps the better claim, Because it was grassy and wanted wear; Though as for that the passing there Had worn them really about the same,
And both that morning equally lay In leaves no step had trodden black. Oh, I kept the first for another day! Yet knowing how way leads on to way, I doubted if I should ever come back.
I shall be telling this with a sigh Somewhere ages and ages hence: Two roads diverged in a wood, and I— I took the one less traveled by, And that has made all the difference.
Meaning of the Poem.
This poem deals with that big noble question of “How to make a difference in the world?” On first reading, it tells us that the choice one makes really does matter, ending: “I took the one less traveled by, / And that has made all the difference.”