Because the beaver isn't just an animal; it's an ecosystem!

Category: Beaver Behavior


I first became aware of Bob Armstrong of Juneau, Alaska when I read about his ‘beaver team’ back in 2008. He was using volunteers to wipe out the troublesome beaver dams that flooded the trails at the state park so the beavers wouldn’t need to be trapped. (Very frustrated but lucky beavers!) I was able to introduce Bob to Mike and he was able to get the rangers to pay for him to come out and do a complete assessment of the situation. Along the way Bob and his colleague Mary Wilson published a beautiful book of the Mendenhall Glacier Beavers, which he was kind enough to donate to the auction at the festival many times.

Suffice to say that because of Mike’s advice Bob’s beaver team finally got a break, the trails were protected and those hard working beavers finally got to have a dam. Lory actually met Bob when she went to Alaska and we’ve been in touch all along. Yesterday he sent me word that his book was going up online as a pdf and sent me the link. You can imagine how excited I was to hear it! I put a  permanent link on the left margin but you should really go check it out now.

Screen shot 2014-12-19 at 3.08.14 PM
Click to view

We were eager to study all the details like what the beavers ate and how they lived. I love his photo of the beaver dam at the glacier so much it has been my screen saver for 5 years, and I don’t think I will part with it ever. It looks to me like those beavers know even when things are hard that with a little effort anything is possible.

mendenhall
Mendenhall Glaciar Beaver Dam – Bob Armstrong

He also has been working with an underwater cam and recently found the perfect spot to install it. This is a beaver entering the lodge under the ice. Just think how lucky our beavers are!

Beaver Entering Lodge Under the Ice from Bob Armstrong on Vimeo.


Danvers SwampWalk under water

The problem is not with the walkway sinking into the muck, said George Saluto, a former Conservation Commission member who was the driving force behind the SwampWalk.

Instead, beaver activity, a surge of rainfall and a stretch of boardwalk built slightly lower than the rest of the lumber pathway has led to its being submerged

Two families of beavers have been building dams and blocking culverts and outflows, raising the level of the swamp, Saluto said. The southern section of the walkway was built, he added, when the area was not getting a lot of rain.

 “We are off on a new adventure,” Saluto said. “We are simply responding to a very productive — two very productive — families of beavers.

Well, there you have it. Yet another beaver bemoaning story out of Danvers MA, who brought us so many greatest hits this year, like the beaver they trapped but weren’t allowed to remove, and the huge developer who wanted everything but the beavers.

Now beavers (and rain and snow) are raising the water level and flooding parts of their swamp path. I guess they have two lodges so they’re sure its two families, although that would be very, very remarkable. Research tells us that different families need their own territory of at least 2 miles, but if the habitat’s very very rich, like those beavers in the far reaches of Canada who built the dam visible from space, they will share.

Gee, do you think this is extraordinary habitat? Or do you think they possibly got it wrong?

It took 10 years to plan, three years to build, and the collaboration of two towns. The walkway allows visitors to walk into the middle of the swamp, providing views of plants, birds, turtles and beaver dams that can’t be seen from the rail trail. There’s an observation deck with seating, too. A grand opening was held in May 2013.

When volunteers first started the northern section of the SwampWalk in 2010, the rainfall in March, April and May was 20 inches, Saluto said. Before the group started the southern section in 2012, the rainfall in February, March and April was 7 inches.

In the past three months, however — even before this week’s rainfall — Danvers received 13 inches of rain, Saluto said, 6 more than when the southern walkway was constructed. The southern section was built slightly lower than the northern section.

Instead of trying to install beaver deceivers, devices that allow water to flow through beaver dams and keep beavers at bay, the SwampWalk team has decided to raise the walkway’s elevation.

Well that’s interesting. I mean why protect the culverts when you have the money to rebuild the entire walkway? Why fix a flat when you can afford a whole new car? I would ask what they plan to do when the water level rises higher still, maybe because of the next 13 inches of rain or the beaver dam that blocks the culvert, but I won’t bother. I know what they’ll do. They’ll say “We tried a 6000 solution to save the beavers but that didn’t work, so we’re going to have to kill them.” Let’s mark our calendars. I think it will happen sometime in April 2015.

Got any spare change? They end the article with a request for donations.

Now we head west a bit across the United States for a story about beaver from Illinois, the state where the 84 year old man was hit in the head with a log after blowing up a beaver dam. IL  has never been a hot bed of progressive beaver understanding. I believe I once said of them

“Remember this is Illinois where a cynical person might say you could fit all their beaver appreciation and knowledge into a teaspoon and still have room leftover to sweeten your coffee”

So it’s nice to read at least a benevolent article about beaver from the state.

Trail leads to adventure

Not long ago, I was set for a nice long hike in a nearby park to work off stresses. I had my binoculars, camera, and a little snack to enjoy along the way.

At the trailhead is a small creek that runs underneath a rock outcropping. No sooner had I entered the trail, when I observed a newly-constructed beaver dam on the creek. I paused to take a look at it. This led to following a few of the “beaver runs” away from the stream to the trees they gnawed.

 I thought to myself that I should take a few pictures of the beaver dam, runs, and gnawed trees to go into the Lowell Park Nature Center. We have a beaver lodge there for children to explore. I thought I might construct a photo montage of beaver activity.

The article goes on to describe his watching deer and woodpeckers. What do you wanna bet that the next time he visits that beaver pond he’ll see more wildlife? If it’s still there he will.

 


 beavers

CaptureDSCN0546Our beavers got three and a half inches of rain yesterday, but the flow device was still standing and there was a wet bump under the water indicating at least the mud part of the dam was still in place. I received an email from Robin in Napa which got much more rain than we did. She was heart broken by her visit to the DSCN0551beloved dam that was no longer visible under flooding. I of course said the usual things I say to console myself when these things happen. Beavers rebuild. The dam is probably partly still there underwater. Beavers have faced much harder things than this, have faith in them. And even in the hard flow their lodge was still standing, which was encouraging. Rusty went down a little later and could still see the outline of the dam underneath. (There art thou happy.) But beavers have hard jobs, there’s no denying it. There’s a reason they’re so busy. Our lazy lives are much easier by comparison. Imagine being the breadwinner, the contractor  the engineer, the flood control, and the public works department all at once.
outlineRecognize that familiar bump? It’s what we see every year after a washout,  and it means things aren’t as lost as you thought. I’m just thrilled that there are other souls in the world watching beaver dams in rain storms.

Jon just trotted down to look at our wet “bump” this morning, which he says is still visible. The level is too high to see if the filters in place, but he thinks it is. Jean took this movie just now with her phone. IMG_0628. From now on we can assume our beavers will be doing lots and lots of this.

beaver repairsNow if you have time before all the Christmas parties and you happen to be anywhere near Cape Cod you should really plan on attending this tonight.

 College Students to Present Environmental Science Research Results

The public is invited to attend a symposium featuring the research results of 21 undergraduate students who are participating in the Marine Biological Laboratory’s Semester in Environmental Sciences (SES) program. The symposium will be held from 8:20 AM to 3:30 PM on Friday, December 12, in the MBL’s Lillie Auditorium, 7 MBL Street, Woods Hole.

Sounds amazing. There’s a day worth of 15 minute presentations, but the last three look particularly interesting:

2:45-3:00 – Delaney Gibbs, EARLHAM COLLEGE
The effect of beaver ponds on the nutrient concentrations in the Cart Creek/Parker River Ecosystem within the Plum Island Estuary watershed
3:00-3:15 – Julia McMahon, DICKINSON COLLEGE
Influence of beavers on benthic community trophic structure in Cart Creek within the Plum Island Estuary watershed
3:15-3:30 -Jessie Moravek, NORTHWESTERN UNIVERSITY
The effects of beaver dams on nitrogen-mineralization and community structure in a forest ecosystem

 Oh, to be in Massachusetts now that beavers are the hot topic! I have written the presenters all individually and asked them to share their findings, hopefully we can find out soon. In the meantime keep an eye out for wet bumps in creeks near you!


Back from the brink: See European beavers at work

Their destructive reputation seems to belie them, but beavers are now recognised as significant resources for carbon sequestration – the wood locked up in their dams and ponds accounts for a surprising amount of carbon.

 This may or may not influence a shadowy group of people known as “beaver bombers”. These, apparently, are eco-vigilantes who release beavers back into Britain.

Believe it or not, that phrase was used earlier in the year in a National Geographic article. Apparently no amount of mocking and derision can discourage it because here it is again in NewScientist, a global service housed in the UK. This, along with beaver raising temperatures for fish and beavers causing beaver-fever, and “You can’t get pregnant the first time” is the kind of totally inaccurate falsehood that we at Worth A Dam recognize as sadly incurable. We are never going to eliminate the rumor that fans have carpeted the land with beavers. We just aren’t.

How do I know it’s not true anyway?

In all the world, on all the continents, in all the cities, in all the land, have you EVER met any single human more insane about beavers than I am? Go ahead, I’ll wait while you think about that. Finished? Now I know for a fact that I haven’t ‘bombed’ or reintroduced beavers anywhere. So if the craziest beaver fan on the entire planet hasn’t done it, who could have?

beaver bombersCommunity support builds for wild beavers

As community support builds for Devon’s wild beavers, an oil painting of a Devon beaver has raised £700 for Devon Wildlife Trust’s work to keep the animals on the River Otter.

The canvas, by renowned east Devon wildlife artist Emma Bowring, was donated to the charity’s Devon’s Wild Beavers fundraising appeal. Support has also been forthcoming from Ottery St Mary schools, Exeter businesses – and even TV presenter Chris Packham.

 The aim of the appeal is to keep the wild beaver population on the River Otter by securing a licence from the government for a five- year monitoring project to assess the beavers’ impact on local landscapes, wildlife and communities.

10801570_1590048444550624_6264017908878124563_nThat really is a nice painting, very luxurious fur.  I was thinking last night about where beavers groom themselves when it’s pouring rain. Obviously there isn’t enough room in their lodges or holes for everyone to do it there. I was happy to remember that our beavers have plenty of bridges they can groom under which will give them cover for a few minutes. There’s something to be said about urban life.

 The presence of these animals might even influence artistic tastes. Dan added: “Emma Bowring told us that the most popular British animal for her commissions is the otter. If the government grants Devon Wildlife Trust the licence to keep Devon’s beavers in the wild, perhaps Emma will begin receiving requests for beaver paintings.”

Well, duh. Come look at the artwork in my dining room?

SRF 2016The agenda is out for 2015 Salmonid Restoration Conference in Santa Rosa. You should check it out. Just look at this workshop on restoring urban streams?! Maybe you want to come?


Winter is Cold!

Beavers live in the water!

Trees are involved in someway!

News at 11:00!

Cache of sticks and a tail that’s thick

One fall a young beaver, probably a two-year-old kicked out by its parents, built a small lodge in the old mill pond below our house. On cold January days when temperatures were below zero, I looked at the snow-covered lodge and wondered if the beaver was still alive. But when the ice melted in late March, it was swimming around again.

First of all, beavers don’t get kicked out by their parents. (Your parents may very well have kicked you out, but beavers don’t) That’s the kind of ignorant myth that gets repeated at the very worst scout hikes. Second of all,  that headline is the kind of rhyme attempt I HATE.  (Like Clicket or Ticket.) Unless you’re writing for preschoolers or alzheimer patients thick and sticks don’t rhyme any more than moon and moo do. Besides,  this is a news headline, not a nursery story. So just cut it out.

Third, and this is my real point, I’m starting to get good and sick of these winter stories about  beavers living in frozen streams and surviving off a food cache. We KNOW already. Stop using column spaces to print pictures like this!

View inside a beaver lodge in winter.
(Photo: Adelaide Tyrol illustration)

You think I exaggerate?

Beavers in winter

Beavers seldom venture into the open air outside the lodge in winter, when ice covers their ponds, so for months a family of beavers breathes “indoor” air, using oxygen and generating carbon dioxide. Beaver lodges have underwater entrances, and mud seals the walls, so air exchange is effected through a ventilation hole in the roof. Apparently this roof vent is sufficient to keep carbon dioxide from building up and allow an influx of oxygen, because when researchers measured the levels of those gases inside an occupied lodge, they stayed nearly constant.

How about this story from Malibu recently?

 Furry Woodsmen Excel At Forestry

Among their remarkable traits is the flat, hairless paddle-like tail that allows beavers to prop themselves up while standing and whack the water in a highly effective, loud warning mechanism. Their dense undercoat of fur provides excellent insulation in water. Their lips close behind the huge, ever-growing front teeth for underwater chewing. They have self-stopping ears and nostrils for diving and large back feet with webbed toes, making them powerful swimmers. Two serrated claws on each hind foot are used for combing water repellant oil through their coat. Small, agile front fingers allow delicate handling of tiny objects.

Don’t get me wrong. I like for people to talk about beavers. I do it every day. We all should. But these articles advance the conversation not at all. These stories take up space and later when someone wants to write about real issues like beavers and salmon,  or frogs, or drought the managing editor will say, nooo we can’t run another beaver story. We did that one in December.

So just stop it. Think of your mother’s advice. And if you can’t say something important about beavers, don’t say anything at all.

 

 

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