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

Month: June 2016


We’ve enjoyed pretty good spate of beaver news with accolades to their many benefits, and appreciation for their labors. But America is a big place, and ignorance and fear persist despite all our efforts. Here’s some reminders, the first in response to the toddler swiping by that gaitor in Florida.

Alligator attacks: How to avoid the reptiles, stay safe around the water

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Young alligator on a Hillsborough River canoe trip:

The horrific death of Lane Graves, a 2-year-old Nebraska boy snatched off a Disney World beach by an alligator, has raised questions about safety around the water.

In Alabama, alligators are mostly found in the coastal and inland waters of the Mobile Delta but have been reported as far north as the Tennessee and Elk Rivers. In 1995, as many as 50 American alligators were released in the Alabama portion of the Tennessee River in an effort to keep the beaver population under control.

Be careful what you wish for?  Apparently they brought in alligators to kill the beavers and then they ate all their cats. Sad face. I always suspected beavers had something to do with the arrival of alligators. Although beavers do thrive in gaitor habitat, so maybe someone someday could explain to me how that happens?

Well, so much for Alabama and beavers. I got excited when I saw this quote from Texas.

 “Just as snakes and insects, beavers are also important for our county ecology.

I’m not going to tell you why though, I’m just going to tell you how to kill them.

Agrilife: Controlling Beaver Damage

According to Texas A&M AgriLife Extension information, most of the damage caused by beavers is the result of bank burrowing, dam building, tree cut­ting or flooding. Levees or pond dams weakened by beaver burrows may collapse during periods of high water. If creeks, drainage ditches, culverts and spillways become blocked by beaver dams, adjacent pasture land, timberland and roadways can be damaged by flooding and erosion. Beavers can damage boat docks and fishing piers by build­ing their lodges underneath them. Beavers also can cause extensive damage to agricultural crops such as corn or sugar cane, although their damage is more commonly inflicted on trees along rivers, streams and lakes. In urban areas, beavers dam­age fruit trees, gardens and ornamental trees Beaver control is best accomplished as soon as there is evidence of beaver damage.

Once beaver colonies become established over a large area, controlling them can be diffi­cult and costly. Fencing of culverts, drain pipes or other structures can sometimes prevent damage; however, beavers often simply incorporate the fence into their dam. Fencing lakes and ponds to exclude beavers is generally not practical. Barriers of sheet metal or hardware cloth placed around the bases of valuable trees may help prevent damage. The bar­rier should extend from ground level to a height of about 4 feet. A variety of traps and trapping methods is effective in controlling beavers. Live traps, leg­hold traps, conibear traps and snares can be used. The effectiveness of any trap is determined by a person’s knowledge of beaver habits, as well as proper trap selection and placement. Beavers are classified as furbearers in Texas, but it is legal to trap them. Under state law, a per­son may trap a furbearing animal at any time if it is causing damage; however, the pelt can be sold only during furbearer season and with the proper licenses.

That’s right, beavers, like snakes and fire ants, have a mysterious ecological role to play. You won’t read about it here though, during the floods or doing the drought that’s coming next. I’m a vet and not an ecologist so I have NO idea how flow devices worked. And we’re sure relieved to learn that beavers are considered fur-bearers in Texas. Sometimes you guys ain’t all that bright, and I thought you might have catagorized them as amphibians!

Lets end with a lovely photo of the first family enjoying the outdoors in Yosemite.

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I was especially struck by this quote he delivered in the park, can you spot what is clearly an obvious typo?

“The first time i saw a bear and her cub. That changes you. You’re not the same after that. And I want to make sure every kid feels that.” –President Obama

note to president


I was interested to read this discussion on the beaver management forum group on Facebook and thought I’d share.

Question: Today we tried to install our first flexible pond leveler in Switzerland. All went fine until we tried to install the leveler in the pond. We had the problem that it was impossible to submerge the pipes. What did we forget? Maybe it was because we didn’t cut the pipe lengthwise? Michael

Ahh even I know the answer to that! apparently the swiss are better at making watches than installing flow devices. Here’s what Mike Callahan wrote back to the alps.

Answer: Yes you are correct the pipes need to vented. Please refer to your DVD. The corrugated pipes will not sink if there is any air trapped in them. Each ridge must be vented on the top surface of the pipe to allow water to displace the air. On double wall pipe the vent holes must be on the top and underside of the pipe. http://www.beaversolutions.com/self_help_dvd.asp
Good luck!

Art Wolinsky of Delaware was kind enough to post this helpful graphic.

13419109_10153552441711498_2056087399844787533_nNow let this be a lesson to you. Never try to install a floating pipe without putting holes in it! Speaking of lessons I’m finally on the last chapter of Moby Dick. Spoiler Alert: the whale and the narrator live, and everyone – else not so much.

In festival news there were some grand volunteers offered yesterday and we have a final count of 35 exhibits. Respectable numbers but I’m hoping to bump that to 40, so I have my poking stick handy.

It’s so fully kit season  that everyone assembled at the Napa pond last night, human and beaver alike! These are the golden nights of suspense that will glow in my mind forevermore. Rusty saw all 5 at once, and was able to get four in the same frame.

four
Four at Tulocay beaver pond: Rusty Cohn

I have learned my lesson after 9 years. You should have too. First the entire family assembles. Then it’s time for a caution float or two.

And guess what happens after that?

Two kits 2013
Two kits 2013: Cheryl Reynolds

Happy Father’s Day to everyone out there, and of course it means to me that I need to post this again, which made me tear up again this morning missing our widow.

Father daughter dinner


Sad news yesterday in the field of ecology. Robert Paine passed away at the age of 83. If you don’t know why it matters, Paine was the one whose research originally coined the term “KEYSTONE SPECIES” in the late 60’s. Our friend the beaver would be called this without him! Thanks Robin of Napa for sending the article. I can only wonder what our bracelets would have looked like without him!

Bob Paine, ecologist who identified ‘keystone’ species, dies at 83

Bob Paine, an ecologist who conducted seminal experiments along the coast of Washington state in the 1960s, pulling starfish from the rocks and tossing them back into the ocean to demonstrate the consequences of disrupting an ecosystem with the removal of a single “keystone” species, died June 13 at a hospital in Seattle. He was 83.

Dr. Paine was regarded as one of the most significant ecologists of his era, a scientific ad­ven­turer who trekked across wave­-battered shores of the Pacific Northwest to observe, document and explain the forces that govern and sometimes upset the complex network of creatures in an ecosystem.

His concept of “keystone” species, named after the stone at the apex of an arch that supports the other blocks in the structure, refers most strictly to predators such as sea otters, wolves and lions with outsize influence on their communities. A groundbreaking idea when Dr. Paine introduced it in the late 1960s, the “keystone” species is today a fundamental of ecology textbooks.

Dr. Paine published his findings of the event, which he called a “trophic cascade,” in a now-classic article in the journal the American Naturalist, “Food Web Complexity and Species Diversity” (1966). Three years later, he introduced “keystone” species as an ecological term.

I actually had no idea that the concept of ‘trophic cascades‘ came first and from the same bright mind. Nearly everyone I meet trained recently goes out of there way to explain that the term ‘keystone species’ isn’t used much anymore and the field is more interested in ‘trophes’. Which, as it turns out, are all courtesy of Dr. Paine. Thank you so much for showing us the world and teaching us how it works!

Now I know we’re all feeling the burden of kit-season-without-kits of our own for the first time in a decade. So I thought I’d share a little Mountain House comfort with you for cheer. Caitlin was surprised that the beaver kit was out early an braver than his family, all of which Martinez has come to understand well over the years.

 


Day four of “Project Habituation” and as predicted it was the most successful yet. Two beavers and several visits by dad working on the lodge. Even mom was seen (larger) shaking her head and feeding. Nothing while it was bright enough to film so mostly we were eagerly watching a bunch of this:

But still. Much better than the start and I’m sure if the project had days 5,6, and 7 we’d be happier still. Dream on! I’m just lucky I got Jon to ever agree to this brief insanity and won’t push my luck.

(Yet.)

We were still thinking about our slow improvements and micro-curve of success when Rusty Cohn’s photos arrived from last night. Of course beavers, and of course beautiful. Talk about the grass being greener! Still scratching his mosquito bites and hunched from lack of sleep Jon cursed at the computer screen before grumbling back to bed.

“fuckingnapa fuckingtopia!

In addition to the enviable beaver photos, I particularly like that capture of the green heron doing his odd neck stretch. The birds are so twisted and stump-necked I never would have thought it possible if I hadn’t seen this a few years ago.  Apparently beaver ponds are the gift that keep on giving.


Methought I heard a voice cry, “Sleep no more!
Macbeth does murder sleep”.
Act II: Scene 2

Day three of operation habituation and we saw a beaver mud the dam and swim into his same ‘chewing thoughtfully’ spot for a munch – this time facing us. I have realized something important though. After careful analysis it is clear that the beavers aren’t habituating to ‘us’ so much as we are habituating to the fact that these are different beavers that play by different rules. Cautious and wary in every way, which I think is good for them. They require protection, and quiet – trains not withstanding.

I take comfort from the fact that we are still “In Beaver World” as Enos Mills would say – just a dam different beaver world!

Good news yesterday as we learned that the Alhambra Valley Band will still be playing the opening for the festival, and our grant was recommended by the city manger to receive 1000 dollars towards the mural. The council voted last night and I’m going to assume we’re good to go. (I had asked for two thousand but, hey I’m pretty happy to think that the city of Martinez will be paying for Mario Alfaro to paint beavers after forcing him to paint over them before.)

A final bit of beaver news this morning involves the successful protein analysis of the oldest giant beaver skull on record. Apparently this beaver ate his wheaties.
Previously, researchers studying ancient proteins rely on fossils that were dug up for that purpose. However, the new study, published in the journal Proceedings of the Royal Society B, used a giant beaver skull that was collected in 1845 and has been housed at the New York State Museum.
For the study, researchers extracted proteins from the skull of the giant beaver belonging to the species Castoroides ohioensis. Using mass spectrometry analysis, the researchers search for proteins, chains of amino acids assembled from instructions encoded in DNA that perform a wide variety of functions in living organisms.

For the study, researchers extracted proteins from the skull of the giant beaver belonging to the species Castoroides ohioensis. Using mass spectrometry analysis, the researchers search for proteins, chains of amino acids assembled from instructions encoded in DNA that perform a wide variety of functions in living organisms.

The researchers then detected many samples of collagen 1 in the protein they extracted. Collagen 1 is the most common protein in bone. The researchers also found post-translational modifications, chemical changes on the surface of the protein that are not defined by DNA.

I think one of the reasons this study is making a splash is that it bolsters the arguments about why we need carefully maintain specimens. As science pushes forward. we are finding that old bones release new secrets and we need to be ready. I’m not really sure why collagen 1 was present in the beaver skulls, but it is the most common protein in the human body an if you want to read up on this you can go here and explain folding and secretion to me.
Not being an expert on the subject, I was mostly interested that the original skull had been ‘shellacked’ for preservation, and since the shellac contains proteins too, they did a sample from inside the nasal cavity of that skull where nothing was painted.

Silly specimen keepers! If they had ever watched the ‘antique road show’ they would have know that the original finish is always more valuable!

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