So the birthday beaver bash continues with beavers on CBS news over the weekend and a fine appearance with Leila and Emily to boot. I will share that soon but this news has waited 30,000,000 years already so it gets to go first.
A new analysis of a beaver anklebone fossil found in Montana suggests the evolution of semi-aquatic beavers may have occurred at least 7 million years earlier than previously thought, and happened in North America rather than Eurasia.
In the study, Ohio State University evolutionary biologist Jonathan Calede describes the find as the oldest known amphibious beaver in the world and the oldest amphibious rodent in North America. He named the newly discovered species Microtheriomys articulaquaticus.
Calede’s findings resulted from comparing measurements of the new species’ anklebone to about 340 other rodent specimens to categorize how it moved around in its environment – which indicated this animal was a swimmer. The Montana-based bone was determined to be 30 million years old – the oldest previously identified semi-aquatic beaver lived in France 23 million years ago.
Watery beaver! Just so you understand this isn’t a new FIND but a new understanding of the previously found fossil because god knows people get the wrong ideas about beavers all the time. This little beaver adapted to life in the water SEVEN MILLION YEARS earlier than we used to think. And it happened in north America, not Europe.
The scientists, including Calede, who found the bones and teeth of the new beaver species in western Montana knew they came from beavers right away because of their recognizable teeth. But the discovery of an anklebone, about 10 millimeters long, opened up the possibility of learning much more about the animal’s life. The astragalus bone in beavers is the equivalent to the talus in humans, located where the shin meets the top of the foot.
Calede took 15 measurements of the anklebone fossil and compared it to measurements – over 5,100 in all – of similar bones from 343 specimens of rodent species living today that burrow, glide, jump and swim as well as ancient beaver relatives.
Running computational analyses of the data in multiple ways, he arrived at a new hypothesis for the evolution of amphibious beavers, proposing that they started to swim as a result of exaptation – the co-opting of an existing anatomy – leading, in this case, to a new lifestyle.
“In this case, the adaptations to burrowing were co-opted to transition to a semi-aquatic locomotion,” he said. “The ancestor of all beavers that have ever existed was most likely a burrower, and the semi-aquatic behavior of modern beavers evolved from a burrowing ecology. Beavers went from digging burrows to swimming in water.
As I have painfully learned this year, anklebones are very important and understanding the right way to use them so they do not break is even more important.
Microtheriomys articulaquaticus did not have the flat tail that helps beavers swim today. It likely ate plants instead of wood and was comparably small – weighing less than 2 pounds. The modern adult beaver, weighing 50 pounds or so, is the second-largest living rodent after the capybara from South America.
It looks like when you follow Cope’s Rule, (Keep getting larger as you evolve) it’s not good for you – it sets you on a bad path in terms of species diversity,” Calede said. “We used to have dozens of species of beavers in the fossil record. Today we have one North American beaver and one Eurasian beaver. We’ve gone from a group that is super diverse and doing so well to one that is obviously not so diverse anymore.”
Less than 2 pounds! That’s the size of a baby muskrat! I wonder what they looked like. And would still like to know when they started building dams…
Now because we all were good and did our science lesson for the day we get to go to the movies. Enjoy…
This oil painting of Robert Stuart by an unknown artist is through the courtesy of Jane Stuart Vander Poel, great-great granddaughter of Robert Stuart.
On June 29th 1812, Robert Stuart, Benjamin Jones, François LeClerc, André Vallé, John Day, Ramsay Crooks, and Robert McClellan left Astoria for St. Louis with two other Astorian parties. Crooks and McClellan had given up their partnership shares in the Pacific Fur Company, and wished to return to St. Louis. As the Stuart party approached the Willamette River, John Day become incoherent. Robert Stuart realized it would be impossible to keep Day with the St. Louis party. John Day was placed under the care of several Wapato Indians and sent back to Astoria.
The Robert Stuart party left the two other parties of Astorians at the mouth of the Walla Walla River. After trading for ten horses, Robert Stuart and five men proceeded over the Blue Mountains to the Grande Ronde Valley. In the area where the Owyhee River emptied into Snake River, a Shoshone Indian approached the party. The Shoshone told Robert Stuart he had guided Wilson Hunt and the Overland Astorians over Teton Pass to Henry’s Fork of the Snake River. The Indian told Stuart there was an easier route through the mountains than Hunt had used.
I without lofs of time offered him a Pistol a Blanket of Blue Cloth a looking glafs and a little Powder and Ball if he would guide us to the other side, which he immediately accepted….
Two days later the Indian disappeared with Stuart’s riding horse.
Above Salmon Falls on the Snake River, Robert Stuart encountered John Hoback, Edward Robinson, Jacob Rezner, and Joseph Miller. After being left at Fort Henry by Hunt, these four and Martin Cass had trapped along the Idaho-Utah border and a good portion of Wyoming. Joseph Miller told Stuart the Arapahoe had robbed them twice, and Cass had abandoned them with the last of their horses. Living on what fish they could catch, the destitute trappers were trying to reach Astoria.
Robert Stuart’s party arrived at Hunt’s caches near Caldron Linn four days later. Six of the caches had been plundered. Stuart opened the three remaining caches and outfitted Hoback, Rezner, and Robinson to trap the area, until John Reed arrived to retrieve the cached goods. Miller stayed with the Stuart party.
The humble beaver could become one of America’s hardest working allies in the race to adapt to climate change.
Beavers are natural engineers. They instinctively build dams and canals of water to keep themselves safe because they’re clumsy on land. And capturing that water creates ecosystems for other animals to survive, earning beavers the moniker of a “keystone species.”
A growing movement of nonprofits, experts and government agencies see a potential to take a lesson from beavers’ natural engineering prowess to capture more of that water for the places that desperately need it.
“Beavers benefit a lot of things in the context of climate change,” Emily Fairfax, assistant professor of environmental science and resource management at California State University Channel Islands, told ABC News.
“The ones that are most directly sort of in our eyesight right now is the beavers’ ability to protect ecosystems during droughts, during floods, during wildfires, during extreme disturbances. And in those patches of habitat that they’re protecting, there’s a huge amount of biodiversity”
This heat wave, and the threat of wildfires, makes me appreciate #beaver engineered fire refugia even more. This complex is on Little Last Chance Creek up in N. California – in some ways these ponds were a "little last chance" for all the critters during the fire here last year. pic.twitter.com/badIjn55Kx
In addition to storing water, Fairfax’s research has shown that areas with beaver dams are more resilient to wildfires because the plants and trees are so wet they don’t burn. And she said they could help capture water from extreme rain events like the atmospheric rivers in California to be accessed by those water systems later.
“Beavers sort of figured this out instinctually over 7 million years of evolution that their dams and their canals work because they take the whole hydrologic cycle and they just make it more stable, more consistent,” she said.
Beavers haven’t always been recognized for their benefits. Fur trapping dramatically reduced the population starting in the 1700s and even today beavers are sometimes seen as a nuisance and killed. The animals are sometimes relocated away from urban areas where their dams could cause disruptions and flooding, which experts like Fairfax said can sometimes be appropriate but is not always the right approach.
Instead of treating them like pests, groups like the National Forest Foundation are looking to take a lesson from beavers’ work to find a nature-based approach to adapt to impacts of climate change like worsening drought conditions.
“There’s a lot of streams and headwaters to the Colorado River that used to run perennially, year-round, that we now see have stopped. And so we might be able to, as we do enough of these, turn some of those stream flows back on on an annual basis. And seeing those regular additions throughout the year could have huge benefits to the system as a whole,” said Marcus Selig, chief conservation officer with the National Forest Foundation.
Photos show an area near the headwaters of the Colorado River before and after the installation of beaver dam analogs by the National Forest Foundation.
The National Forest Foundation is a nonprofit created by Congress to support national forests. Selig said their work building man-made “beaver dam analogs” can help capture more water in the Colorado River, which has been struggling with historically low water levels after more than two decades of drought.
The analogs are a manmade version of what beavers would instinctively build, using sticks and mud to create a natural barrier to slow water down and create a wetland area that feeds into the river.
“The work we do with beaver dam analogs and low-tech process-based restoration is holding that water in the higher elevations as the snow melts and so that it can be released slowly throughout the year, giving more continuous, dependable flows to downstream users,” Selig said, adding that it can help communities downstream receive water more consistently.
“Our big dream is that we can restore every headwater, every watershed that feeds into the Colorado River on national forest lands. And so we’re working on creating that pipeline of projects right now,” he added.
Selig said this kind of work hasn’t been scaled up enough to identify how much of a larger impact it could have and they still need more funding to do so, but said the foundation is working with the U.S. Forest Service to add projects in 14 different national forests around the Colorado River.
Fairfax said river systems like the Colorado have lost a lot of the wetlands that would have existed 200 years ago so replicating them either by creating man-made beaver dams or relocating beavers to streams in the area can help make the river more resilient to the impacts of climate change.
“Bringing back beavers and restoring the wetlands, it’s not like we’re introducing something new to save the Colorado River Basin. We’re just trying to get it back to the state it was in when it was stable and when it was healthier,” she said.
Similar projects are growing around the country, some with support from states or the federal government. California has dedicated $1.6 million to hire staff to start similar projects in the state.
A key legislative committee has approved new limits on killing beavers in Oregon, which will now be considered by the full House. A last-minute amendment allows beavers to be killed without a permit during emergencies, but the Oregon Farm Bureau remains opposed to the bill.
A proposal to strengthen Oregon’s beaver protections is headed for a House floor vote after a last-minute amendment secured its unanimous approval by a key committee.
Beavers would no longer be considered predatory animals under House Bill 3464, allowing state wildlife officials to manage the species on private lands instead of farm regulators.
Supporters of the bill argue that as “nature’s engineers,” beavers make improvements to waterways that are particularly valuable as the state faces increasing droughts and wildfires.
“Despite these clear benefits, Oregon law currently allows unlimited beaver killing year-round, including during breeding and rearing season, without a permit — even if the beaver is not causing any damage,” said Rep. Pam Marsh, D-Ashland.
Under the original version of HB 3464, the changed designation meant landowners would need to obtain permits to kill beavers. Such permits aren’t required for predatory animals, including feral swine, coyotes and rodents.
While the bill would ensure “lethal removal is still an option,” permits would allow beaver populations to be managed and tracked by the state’s Department of Fish and Wildlife similarly to fur-bearing animals, Marsh said.
“This is just another species that will be added to the list,” she said.
Though the bill’s proponents claim these permits can be obtained over email free-of-charge within about 30 minutes, the new requirement didn’t sit well with critics who said they’d impose a time-consuming barrier during pending disasters.
If an irrigation canal is failing, for example, urgent repairs may require taking the life of a beaver to prevent flooding that endangers people and property, said Gene Souza, executive director of the Klamath Irrigation District.
“There are emergency situations that occur at two in the morning, sometimes on Sundays, sometimes on Saturdays,” Souza said.
The bill’s supporters acknowledged that beavers can be damaging but said their usefulness justified regulating their lethal removal more strictly.
Beaver dams reconnect creeks and streams with their floodplains, buffering against drought effects and creating “refugia” that shelter wildlife, livestock and habitat from wildfires, according to proponents.
Unlike human efforts to restore impaired waterways, which can take significant investments over decades, beavers can perform the work within years without charging a single dollar, said Emily Fairfax, an assistant professor of environmental science at California State University.
It will be an improvement but sheesh -lethal removal?- we’re not really that difficult to move to where we’re wanted! Read or listen the whole report.
Dr. Rick Lanman stands in Adobe Creek in Palo Alto on March 31, 2023. Photo by Magali Gauthier.
When Dr. Richard Lanman purchased his Los Altos home in the 1980s, Adobe Creek, which snaked behind his backyard, was at best a rivulet of trickling water in the summer. In good winters, a rushing torrent carried logs, leaves, silt and debris out to San Francisco Bay.
But his neighborhood’s old-timers remembered Adobe Creek as a year-round fly-fishing paradise until the 1950s. His 80-year-old neighbor Herb Bickell told Lanman in 1987 that he’d caught fish from his backyard.
“So too, did Sen. Alan Cranston, who lived just a little bit upstream from us,” Lanman said.
But now Adobe Creek is dry for half the year, and there are no fish. Bickell wondered why the creek had undergone such a drastic change.
“Maybe there were beavers,” said Lanman, a Los Altos-based physician scientist, historical ecologist and president of the Institute of Historical Ecology. “One of my theories is there were beaver ponds or percolation ponds that raised the water table so that in our dry season, when the water table is high enough, it recharges the creek.”
Lanman’s urge to answer that question became an additional career in ecological history, leading to research into the Midpeninsula’s and south San Francisco Bay’s missing links. Now he and his colleagues have published groundbreaking findings confirming the past existence of local populations of Chinook salmon, American beavers and Tule elk.
They’ve also suggested possible ways to bring the species back.
Little is understood about California’s historical ecology prior to the arrival of the Europeans, whose actions wiped out animal populations, he said.
“A lot of the species are already gone by the time the U.S. takes California from Mexico, who had just taken over from Spain,” Lanman said.
Zoological records from the time were also not plentiful.
. . .
Hunting for beavers
A beaver swims in a creek in Palo Alto on Sept. 16, 2022. Courtesy Bill Leikam.
Another species that has intrigued Lanman are beavers.
Scientists traditionally dismissed the beaver as a nonnative to the Bay Area, he said. This stance was largely influenced by the 1937 book “Fur-bearing Mammals of California,” written by Joseph Grinnell. Grinnell was the University of California, Berkeley’s first director of its Museum of Vertebrate Zoology and one of the most well-known figures in American natural history in the early half of the 20th century. Grinnell maintained beavers never lived in the Coast Range and Sierra Nevada watersheds, Lanman said.
“And then I met an archaeologist who found a buried beaver dam in the Sierra Nevada. And that was my first historical ecology publication in 2012. It was a buried beaver dam about 12 feet down, and (we) radiocarbon dated the sticks and it showed this dam had been there for hundreds of years and was rebuilt probably by successive generations of beavers,” Lanman said.
“But it ends around 1850 by radiocarbon dating. Of course, 1850 is the gold rush right? And that’s when all these Anglo Americans hunted everything out,” he said.
By the time Grinnell wrote his book in 1937, the beavers were gone.
“He’s suffering from what we call ‘shifting baseline syndrome,’ where you think the way things look when you were born is the way things always were,” Lanman said.
Lanman searched literature, historical accounts and archaeological evidence for the beaver’s historical presence in local waterways. He didn’t find any beaver specimens in early California museum records.
“But if you look in the Smithsonian, it turns out there’s a beaver skull collected on Saratoga Creek around 1855. So that was the first physical evidence of beaver in the Bay Area in a tributary of the south bay,” he said.
Lanman and colleagues published the findings in the fall 2013 California Fish and Game journal. They studied museum specimens, zooarchaeology specimens, place names, documents and words for “beaver” in local California Native languages for evidence of beavers throughout western California from the California-Oregon border to San Diego and to the southern Sierra Nevada.
The researchers found evidence all over the state. In the Bay Area alone, they found 24 records from Healdsburg to Saratoga and from Bodega Bay to Fremont. These included a zooarchaeological specimen from the Emeryville Shellmound, which included a 1,500- to 1,700-year-old beaver tooth, a more than 2,000-year-old beaver incisor and three beaver bones, dating between 700 and 2,600 years old.
Historical literature also abounds with references to beaver hunts and acquisitions from Native Americans. A 1776 account of the second De Anza Expedition noted that Native Californians wore capes of beaver pelts and pelican feathers.
The famed frontiersman Kit Carson held rights in the 1840s to trap them in the east bay. In Santa Clara County, a 1962 study found historical evidence of beavers “in small numbers at least” in Coyote Creek in Santa Clara County among other places, Lanman and his colleagues noted.
How those beavers might have traveled around the bay and up tributaries in Santa Clara County and perhaps San Mateo County is beginning to be understood due to the presence and growing population of reintroduced beavers.
The semi-aquatic rodents were introduced in the early 1980s to upper Los Gatos Creek near Lexington Reservoir and have been slowly making their way northward. The beavers have expanded their territory by swimming up San Francisco Bay to Coyote Creek to the east; the San Tomas Aquino Creek where it reaches the Sunnyvale Water Pollution Control Ponds; Moffett Gate; and Charleston Slough, just east of the Adobe Creek levee, according to Lanman.
Nine years after the beavers research was published, Palo Alto resident Bill Leikam, co-founder and board president of the Urban Wildlife Research Project and native gray-fox expert, documented the first modern evidence of beavers in a remote section of Palo Alto’s Matadero Creek, where he found two beavers in April 2022. If they are a compatible pair, they could begin colonizing the creek and perhaps slowly lead to a population that would move on to other local creeks, Lanman and Leikam said in November.
Lanman is eager to see how beavers might help revive locally collapsing fish populations. Flood control efforts have altered natural channels, such as San Francisquito Creek, which is dammed by Searsville, the Guadalupe River in San Jose and Palo Alto’s Adobe Creek. Lanman wondered how changes to those habitats have affected fish species such as Chinook and steelhead — and whether nature could reverse the damage.
“Beavers are the one thing we haven’t tried. They have these important ecosystem benefits, not just for our trout and salmon, but for all kinds of critters: red-legged frogs that are federally endangered; birds that are federally endangered that depend on the hunt over water and bats that hunt over water,” he said during a November interview.
Join us in JULY for two days of knowledge sharing, highlighting some of the great work within the field of beaver coexistence in Alberta and surrounding regions. Topics to be covered include: ecological and watershed benefits, coexistence solutions, beneficial management practices, beaver-mediated restoration, and more!
July 13 – all-day, indoor event with presentations, panels, and plenty of time for question-and-answer period and networking (8:00am – 6:00pm)
July 14 – field trip to view nearby coexistence tool installations (8:00am – 2:00pm)
Food included with ticket:
Day 1: Continental breakfast, lunch, snacks, tea/coffee, evening appetizers for networking event
Day 2: Bagged lunch with snacks and water
Please note this is an in-person event. We are unfortunately not able to offer virtual attendance, however, PowerPoint presentation slide decks will be posted on our website following the symposium
*Detailed agenda is coming soon*
A block of standard rooms have been set aside at the hotel venue for $109.49 + taxes per room, per night. If you are interested, these can be booked by using the booking link. The hotel provides a complimentary shuttle to / from Edmonton International Airport as well as complimentary high speed wireless throughout entire hotel.
International Beaver Day was first celebrated in 2009, after being created by a nonprofit group called Beavers: Wetlands & Wildlife. The group chose April 7 as the date because it is the birthday of Dorothy Richards (1894-1985), a woman who had studied beavers for almost 50 years at the Beaversprite Sanctuary in the Adirondack Mountains of New York. She had been an inspiration for Beavers: Wetlands & Wildlife, and the group’s first work was to finish reforming management of the 1,300-acre Beaversprite Sanctuary. They also have worked to stop anti-beaver legislation from being passed in several states, and have worked to find solutions to human and beaver conflicts. Eventually, they became an internationally recognized authority on beavers. In the first year of International Beaver Day, they donated almost 1,000 copies of the teachers’ edition of their DVD Coexisting with Beavers to schools.
There’s more about our day from the site above but you might have seen some of it already. What’s happening now really shows that past efforts to get the word out about how valuable we are is paying off!
A river–forest ecosystem in Northern California, USA within the historic range of American beaver. Including ecosystem engineers in restoration and management decisions may lead to better outcomes for ecosystem functioning. Credit: Understory
In ecosystems, all species interact with each other and their environment. However, some species have a much greater influence than others. Certain plants or animals are able to greatly modify their landscape through just their mere presence. This makes them part of the group know as “ecosystem engineers.”
One of the best known examples of an ecosystem engineer is the beaver. By building dams, beavers change the flow of rivers and transform terrestrial ecosystems into wetlands. This leads to a whole cascade of processes and the arrival of new animals.
Although the individual cases of ecosystem engineers helping biodiversity are well documented, the mechanisms at work are not yet well understood. Scientists from UNIL have developed a guide for predicting and measuring the influence of species on ecosystems under different conditions. The aim of the guide is to include “ecosystem engineers” in the process of biodiversity conservation and ecosystem maintenance. The team’s review is published in Functional Ecology.
To establish this framework, the scientists proceeded in several stages. First, knowledge and literature about the known ecosystem engineers was collected. Next, the team developed a comprehensive framework to model and quantify the effects of the species. Finally, a procedure for including these natural regulators as much as possible in the field was created.
Gianalberto Losapio is the lead author of the study and a researcher at the faculty of Geosciences and Environment at UNIL. He is also affiliated with the University of Milan. He said, “This guide is intended to help specialists and communities ask themselves the right questions when setting up conservation programs. For example: What is the goal? What are the characteristics of the terrain, as well as the spatial context?”
The guide also provides tools to assess the impact of the actions carried out so that they can be adapted if necessary. “Some restoration projects end up being abandoned because introduced species cannot survive,” adds Losapio. “We believe a comprehensive approach is more likely to succeed.”
Burlington, Vt. – Ahead of International Beaver Day (April 7), PETA sent a letter this morning to Champlain College President Alex Hernandez, appealing to him to slap a fur ban on campus so as to protect beavers just like the school’s own beloved mascot, Chauncey.
PETA points out that tens of thousands of beavers are killed every year and that, as Champlain College itself points out, they were once on the verge of extinction in North America due to hunting for their pelts. With a ban, the school could help protect beavers and other animals still trapped and killed for their fur, joining Kingston University in London and the many cities that are also implementing or considering fur bans, and further the college’s mission to advance society and encourage students to help create a better world for all.
“Beavers are caught in steel-jaw traps, which clamp down with bone-breaking force, causing excruciating pain and a slow death,” writes PETA President Ingrid Newkirk. “Please help end cruelty to beavers by informing students and staff members about the threats these animals face and by establishing a fur-free campus.”
PETA’s letter to Hernandez follows.
April 5, 2023
Alex Hernandez
President
Champlain College
Dear President Hernandez:
I’m writing on behalf of People for the Ethical Treatment of Animals—PETA entities have more than 9 million members and supporters globally, including many thousands across Vermont—ahead of International Beaver Day on Friday, April 7, with a dam good request that would help protect beavers like Champlain’s beloved mascot, Chauncey: Will you please ban fur on campus? This step would not only further the college’s mission to advance society and encourage students to help create a better world for all but also help protect beavers and other animals who are trapped and killed for their fur.
As you likely already know, beavers are intelligent and resourceful animals. They’re well gnawn for building dams to create ponds that offer refuge from predators and space for food storage. They also construct lodges that provide shelter and a safe place to raise their young. They’re great swimmers, and their fur is naturally oily and waterproof, which helps them keep dry and warm, even when submerged for a very long time. They’re also among the few animals who can alter their surroundings to produce a suitable home. The dams they make generate wetlands, which are vital ecosystems for many species.
Tens of thousands of beavers are killed every year, often in response to their natural dam-building efforts or so they can be used for their fur. Champlain College even points out that beavers were once nearly extinct in North America due to hunting. To trap beavers, humans often use steel-jaw traps, which clamp together with bone-breaking force, causing excruciating pain. Beavers are also often strangled in neck snares and crushed in body-gripping traps, which are barbaric devices with metal bars designed to slam shut on an animal’s body. Some traps are designed to hold beavers underwater until they drown. But since they’re used to holding their breath while they dive for long periods, death by drowning is a slow, agonizing process for them.
Please help end cruelty to beavers by informing students and staff members about the threats these animals face and by establishing a fur-free campus. Many U.S. cities have already implemented bans on fur sales, and various institutions of higher learning are considering fur bans. Your efforts to help animals would beavery impactful. Thank you for your consideration. We look forward to hearing that Champlain will be a leader on this important issue.
Very truly yours,
Ingrid Newkirk
President
We are intelligent and resourceful and do do well at gnawing trees to sustain us and make our dams, but I’m not sure if the mention above of “being well gnawn” is a punny insert or auto-correct glitch. It sorta fits though. . .
A beaver dam on Lake Lowell in Caldwell, ID | Mackenzie Davidson | Argonaut
The U.S. government is looking to an unlikely rodent in an effort to repair ravaged riparian ecosystems, and it might be working.
Beavers are one of the odder species, in terms of appearance. With their long buckteeth, paddle tail and rounded shape, they don’t often attract sympathy from the owners of the land they choose to settle down on.
Due to unregulated trapping in the 1800s, beavers were largely eradicated from the U.S. This had cascading effects on the ecosystems they once called home. Beavers, as “ecosystem engineers,” change their environment in ways that promote a healthy ecosystem. With beavers gone, the riparian, or water based, ecosystems they frequented were in trouble.
Many other animals rely on the work beavers do to remain healthy. Without beavers, fish populations, predators, birds, amphibians and even the plants lining water banks were suffering.
Since 2008 the Okanogan-Wenatchee National Forest has been reintroducing beavers to various areas in order to promote riparian health. According to the United States Department of Agriculture, the project has documented an increase in salmonid spawning and rearing as a result of the beavers’ presence.
In Idaho there are between 50 and 75 beaver restoration projects currently operational. These projects either directly introduce beavers to damaged riparian areas or have biologists build dam-like structures in order to encourage beaver populations to return to those areas.
The U.S. has a history of killing off vital species, directly resulting in whole ecosystems decaying; a cursory examination of the history at Yellowstone National Park can attest to that. The eradication of wolves, grizzly bears, mountain lions and, of course, beavers have all resulted in the lack of riparian vegetation, predatory species and healthy landscapes.
It brings hope to the environmental community seeing these restoration projects underway, reversing the damage once done to the American landscape. Recent legislation, like Idaho’s SB 1211 and Utah’s HB 469, attempt to undo some of those efforts, but biologists and conservationists are not so easily deterred.
The beaver represents a great success in conservation; once nearly extinct, there are now almost 15 million in North America alone thanks to supremely dedicated conservationists.
Mackenzie Davidson can be reached at arg-opinion@uidaho.edu or on Twitter @mackenzie_films
But coexistence is key. We just want to get along without hurting anyone. So maybe you can help out these friendly folks.
Humans often kill beavers when their damming and tree-chewing behaviors cause problems such as flooding and destroyed vegetation. This approach is ineffective because new beavers will soon move into the empty habitat. Lethal trapping, dam destruction, and culvert unclogging are only temporary solutions that, in the long-run, are expensive and unsustainable.
How is coexistence possible?
Beavers and the wetland habitats they create are beneficial to people, plants, animals, and entire landscapes and watersheds. We believe it is possible for people to share land with live beavers while addressing flooding and tree-chewing problems using long-term, cost-effective solutions.
Got some images of kids playing beaver at the recent SLO County Beaver Festival.
Beavers have returned to the waters of Somerset and Wiltshire, hundreds of years after being wiped out.
Escapes from enclosures and unlicensed introductions are suspected to be behind the rodent’s return.
As many as 50 beavers could be living in the West Country, Natural England has revealed.
The government’s nature advisor had been investigating the possibility of beavers in the region following reports of the rodents in and around the Rivers Frome and Avon. The resulting report, published earlier this month, found a wealth of evidence that beavers were thriving in the areas, including dams, gnawn trees and burrows.
In total, it is estimated there could be anywhere from 36 to 62 adult beavers in sections of the rivers near Bath, Chippenham and Trowbridge, living in 13 families. If baby beavers, known as kits, and family units living in areas of the river which couldn’t be surveyed are included, then this figure could be even higher.
A spokesperson for the Avon Wildlife Trust previously described the presence of beavers in the area as ‘extremely significant’, adding that ‘the presence of this beaver population will support other wildlife and help us to tackle the ecological emergency.’
Where have the West Country’s beavers come from?
Eurasian beavers are rapidly being reintroduced across the UK, having been driven to extinction in the country over 400 years ago through hunting for the fur, meat and perfume trade. The mammals are now present across the country, from Scotland all the way south to Devon and London.
Officially, beavers can only be reintroduced into enclosures with a license from the government. However, many beavers are living wild following escapes from these sites, as well as unofficial introductions.
For instance, one of the UK’s largest populations of beavers can be found in Tayside, Scotland, is thought to be the result of a mixture of accidental and illegal releases.
While beavers are now considered a native species in England, Wales and Scotland, it is still a crime to release them without a license, which can result in up to two years in prison as well as an unlimited fine.
Many of the beavers in the West Country are thought to have been released unofficially, with the report estimating that these have probably taken place since 2016. Others, meanwhile, may be the descendants of animals which escaped from a private collection in the 2000s.
The beavers have now spread widely, with the majority of the families found in the River Frome, a tributary of the River Avon. Four families are found in the Avon itself, while another is found on the By Brook.
Though there had been reports of beavers in the River Brue and Kennet and Avon Canal, the latest report didn’t find enough evidence to verify their presence.
In total, the beavers may occupy as much as 11% of the available riverbanks in the areas of Wiltshire and Somerset where they live. Each family is estimated to have a bankside territory as long as eight kilometres, which is above average for England’s beavers.
While they may cover a relatively large area, the beavers are not thought to be having a major impact on their ecosystem at the moment. Though some families have started building dams and felling trees, the majority are still getting established in their new home.
With beavers having been made a protected species in England in October 2022, it’s thought that their populations will only grow if left undisturbed. While the report notes their activities could eventually pose a risk to transport, this is not likely in the near future.
Instead, it recommends further research to promote co-existence with these beavers. Assessing their genetic health, and coming up with management plans, can help to ensure these rodents can keep beavering away in the West Country.
The signs are instantly recognizable: partially chewed trees, pointy stumps and sprawling collections of sticks and logs in the middle of waterways. These all signal the presence of beavers, the plump, semi-aquatic critters that were once nearly hunted to extinction.
Established wildlife laws and reintroduction brought their numbers to stable levels, but they still remain a fraction of what they once were. Further recovery of beaver populations is crucial.
Because they significantly alter, manage and even improve the areas around them, beavers have earned the title of “ecosystem engineers.” Their work enhances the surrounding landscape and ecosystems, making these critters some of the most important, not to mention adorable, stewards of nature. Here are five ways beavers help the environment.
Beavers help control water flow.
You might assume that since beaver dams block water, they must cause floods, but that’s far from the case. Dams are penetrable structures that slow water flow, resulting in less erosion and flooding than undammed, fast flowing water. Dams physically store water on land where it soaks into the soil and initiates plant growth, able to turn bone-dry areas into bountiful wetlands. If you repeatedly visit beaver habitat in different seasons, you can see the transformations that take place thanks to their dams. A landscape often looks completely different from even just a few months prior.
Beavers improve water quality.
Rainwater runoff from artificial surfaces washes toxins into waterways, threatening aquatic ecosystems. Wetlands surrounding beaver dams act like kidneys by removing pollutants from water, effectively cleaning it. As dams decrease water flow, nutrient-rich sediment usually swept away by the current instead sinks and collects on the bottom. This abundance of minerals filters and breaks down harmful materials like pesticides and leaves areas downstream of dams healthier and less polluted than upstream.
Beaver activity creates more habitat for other wildlife.
Since beaver dams slow water flow, the original path is altered as the water meanders over additional ground, creating more wetlands where other species thrive. Important plants that feed animals and provide for people see their numbers increase over 33% in beaver wetlands, while birds nest on riverbanks, fish swim about and mammals forage for food in these natural havens. In fact, 25% of species living in these wetlands fully depend on beaver activity for survival.
Beavers stop wildfires.
Increasing wildfires destroy nature and emit greenhouse gasses, but beaver activity can hold the devastating flames at bay. Wetlands made by beaver dams concentrate water and moisturize the landscape, making it harder for fires to spread as potential fuel becomes harder to burn. Wildlife can shelter in these wet sanctuaries, safe from an encroaching blaze. Beavers might not drive red trucks or slide down poles, but they make an excellent fire department nonetheless.
Beavers help us fight climate change.
The primary driver behind climate change is the massive amount of carbon human activity pumps into the atmosphere. The more we emit, the more it builds up, but beavers help reduce its accumulation as their wetlands absorb and store the greenhouse gas. Globally, beaver wetlands hold 470,000 tons of carbon each year and perform carbon-capture work worth tens of millions of dollars. Restoring beavers to their natural habitats and widespread numbers can lead to further carbon absorption as the animals proliferate, construct dams and establish more wetlands. More beavers mean more wetlands, which mean less atmospheric carbon, a win-win-win scenario.
The incredible feats beavers perform should not be understated, whether it’s their beneficial environmental work or ability to transform landscapes. As the world’s foremost natural ecosystem engineers, they play crucial roles in managing nature unlike any other animal. You can celebrate these incredible critters on International Beaver Day every April 7. The next time you’re hiking and come across those telltale bites on trees or piles of sticks, be sure to thank a beaver for all they do in supporting the natural world by just being their busy little selves.
A new analysis of a beaver anklebone fossil found in Montana suggests the evolution of semi-aquatic beavers may have occurred at least 7 million years earlier than previously thought, and happened in North America rather than Eurasia.
