Back

Artificial beaver dams saw juvenile coho salmon survival rates go from 8% to 60%

149 points9 hoursdiscoverwildlife.com
reilly300022 minutes ago

I’m rather partial to beavers myself and was sad to learn about their demise in North America. At one point their pelts were referred to as “the coin of the realm” https://youtu.be/8XToPq9lsOM?si=DJKedkQXuzJhSmf7

_whiteCaps_5 hours ago

There's a really good book about a homesteader that did something similar to this in the 1930's in British Columbia, "Three Against The Wilderness". Basically he restored the dams that had been dynamited by the ranchers, and that restored all of the wetlands in the area.

Later on, the government brought him some beavers from elsewhere, and they flourished.

Waterluvian35 minutes ago

I love this. Especially the part where you can ask the Government of Canada for beavers.

But it feels like there’s a bit of surprise to the idea that the environment takes on the form it takes on. And if you take away a part of it, it’ll take on a different form. And if you put that part back, it can take on the earlier form. There is no correct or canonical form.

richiebful15 hours ago

It was an interesting, but counterintuitive result that water temperatures went down after artificial beaver damming. Their theory is that the water is able to permeate more into the ground and exchange heat with the ambient underground temperature [1]

1. https://www.science.org/content/article/beaver-dams-without-...

josefresco6 hours ago

Maybe I missed it, why didn't they just reintroduce beavers?

petcat6 hours ago

The beavers are still there, just not in high numbers like they used to be. Right now the ecosystem can only support the population that is already there. Maybe eventually it will support more and then the number will increase naturally.

cornstalks6 hours ago

TFA implies the issue is land owners won’t allow it:

> But beavers can only thrive if landowners allow them to.

repeekad6 hours ago

Which they never will on their own, so surely conservation regulations need to be enforced, too bad the US is moving backwards right now in that regard

stouset6 hours ago

Then you get people (understandably) upset that just about any work they want to do to improve their own private land needs to involve the EPA and/or a local wildlife commission.

+2
fodkodrasz5 hours ago
nkrisc5 hours ago

The alternative is we drive ourselves ever closer to the brink.

It is entirely possible that our current way of living, including the idea of “private land” as it exists today, may not be conducive to our long-term survival.

The forces of nature care not for our political and philosophical debates.

+1
AngryData5 hours ago
+1
mulmen6 hours ago
messe5 hours ago

Good? They don't own the commons.

cmrdporcupine5 hours ago

Beavers can be incredibly difficult to live alongside of.

My parents have 100+ acres of bush in central Alberta. When they bought the property it was logged out and mostly in a bad abused state and mostly dry. Over a few years, beavers moved in and transformed a formerly semi-marshy spot into a full pond. And then another. And another.

Eventually though, without a lot of predators around (there's some skittish bears, coyotes, that's it) they begin to overpopulate. And any efforts to keep the water level at a certain point starts to get tricky. In order to keep access to some parts of the property my dad ended up having to put in some sneaky culverts with various tricks to stop them from plugging them. (I forget, but he eventually figured out a beaverproof trick).

Even then, every few years the need to "remove" some of the beavers, because they just get to be too many, they run out of poplars near their lodge and start to cause more problems for downstream and upstream neighbours.

They've done amazing things for the property. But when my parents pass it's going to be hard to maintain this property with the beavers actively trying to transform it constantly.

xandrius4 hours ago

Throw in some wolves and create a brand new set of problems :)

throwway1203853 hours ago

That's the beauty of it. When wintertime rolls around they simply freeze to death.

arthurbrown3 hours ago

What are the problems actually? That they have improved water retention and soil hydration?

+2
jpollock3 hours ago
tosapple3 hours ago

what's wrong with it not reverting to nature when they pass? people put flowers on loved ones graves.

cogogo5 hours ago

Busy beaver problem?

parodysbird3 hours ago

Why are you wanting transform the beavers property?

evan_4 hours ago

this is basically the inciting incident of the recent movie Hoppers

cucumber37328425 hours ago

Because the government makes the water that comes with them a huge liability.

Tons of vacant land owners would be happy to allow beavers and everything else if not for the fact that it destroys any prospect of doing anything on the land.

devilbunny1 hour ago

His freeform, not-too-serious libertarianism can easily be mocked, but PJ O’Rourke did have a very good point about well-intentioned but counterproductive environmental legislation like the laws governing wetlands: imagine that, should an Old Master painting be discovered on your property, you were required immediately to cease all other use of the property and protect that Old Master painting against damage or theft, under penalty of law, but without any compensation for the expenses this might incur. You can imagine that any new ones found would simply be burned immediately, not protected. And wetlands laws work a bit like that.

pvaldes6 hours ago

> Maybe I missed it, why didn't they just reintroduce beavers?

My guess is that trees are not there in numbers enough to support beavers. Or maybe they don't want beavers chopping the trees.

krm015 hours ago

Whatever they eat, did that go down to an all time low. Im m curious about the chain reaction vs an isolated result.

tomcam5 hours ago

I am sick of underachieving beavers. Go us! Seriously, that would require statutory change here in Washington state. I live in a rural area with salmon waterways all over. Farmers just quietly clear the way for them, because it's illegal to make any changes to the waterway even if it's trash thrown out of cars.

tolugenius5 hours ago

> I am sick of underachieving beavers. Go us!

This really made laugh for some reason, just imagining a beaver typing away at HN specifically.

pstuart5 hours ago

With freshwater increasingly being a problem, being able to slow down tributaries and allow the water to percolate and help rebuild aquifers is something that should be happening everywhere possible.

Lost cost, high reward. Not sexy enough to get the attention it deserves.

declan_roberts5 hours ago

The temperature is cooler? That can't possibly be the only reason to explain such a dramatic change in survival rates. We definitely need more research on this topic.

oatmeal13 hours ago

There's more food, less energy wasted fighting excessively strong current, and more places to hide from predators. Water quality goes up downstream of a beaver(-ish) dam.

margalabargala5 hours ago

If you do even a moment of reading about salmon, you will find that they are extremely sensitive to warm temperatures. Even a couple degrees F above their "normal" will allow disease to run rampant.

declan_roberts4 hours ago

I give the salmon a little more credit because the entire river can't be a beaver dam. That's their theory and I think will more research we're going to learn more about what's happening here.

analog83741 hour ago

we clearly need to design better salmon.