Beavers: The Original Army Corps of Engineers

Beavers: The Original Army Corps of Engineers: Click for larger picture, Beaver with branch in water, Courtesy US FWS
Beaver with branch in water
Courtesy US FWS,
Steve Hillebrand, Photographer


Hi, I’m Holly Strand from Stokes Nature Center in beautiful Logan Canyon.

Beavers and beaver dams are a common feature of the Utah landscape. You’ll see the dams on smaller streams and side channels, constructed of branches, downed trees and mud. The still, deep water of the resulting pond creates ideal conditions for a beaver lodge. Beavers can escape and hide from predators by slipping into the pond and disappearing into the lodge. Beavers also use their ponds to cache their favorite
food—aspen and willow.

Because of their tree cutting and dam making skills, humans tend to have two divergent opinions of beavers: 60-pound nuisance or environmental engineer.

Click for larger picture, Beaver Lodge, Courtesy US FWS
Beaver lodge
Courtesy US FWS
Hans Stuart, Photographer

Beavers are considered a nuisance when they gnaw down trees that humans want to keep. Dams can flood roads or stop up irrigation canals. When beaver activity conflicts with human interests, they—the beavers–are likely to be trapped and killed.

However, beaver activity has many positive environmental consequences that we are just beginning to appreciate. Wetlands created by beaver dams help soak up sediments, improving downstream water quality. Because of beaver dams, the winter snowpack isn’t lost in a short spring pulse, This results in a more constant stream flow through the summer –and that’s important as Utah’s climate is predicted to become drier. Finally, beaver dams enhance habitat for many other fish and wildlife species and plants.

Click for larger picture, Beaver in pond, Courtesy US FWS
Beaver in pond
Courtesy US FWS
Steve Hillebrand, Photographer

According to Dr. Joe Wheaton, a geomorphologist at Utah State University, there’s a lot of untapped potential for employing beaver engineers in stream and floodplain restoration. Say you want to restore a stream by reconnecting it with its floodplain. You need to excavate channels, redirect stream flow, revegetate and nurture the
area for a long period of time. To accomplish this, you often need a
number of highly trained professionals and some large Tonka toys.

Alternatively –under the right conditions– you might transplant a
colony of beavers and let them apply their vigorous work ethic to your
landscape and get quite satisfying results.

Recognizing that nuisance beavers can be rehabilitated into hard
working wetland engineers and stream habitat restorationists, the Utah
Division of Wildlife Resources has rolled out the state’s first beaver
management plan in 2010. This plan encourages live trapping of entire
families of beavers in nuisance areas and moves them to specific sites where their
environmental services can be appreciated and put to use.

Click for larger picture, Beaver in snow, Courtesy US FWS
Beaver in snow
Courtesy US FWS

Thanks to the USU College of Natural Resources for supporting this Wild about Utah topic.

For Wild About Utah and Stokes Nature Center, I’m Holly Strand.

Credits:
Images:
Text: Stokes Nature Center: Holly Strand

Sources & Additional Reading


ARKive Images of Life on Earth, Information Sheet on Castor Canadensis (including some outstanding videos) https://www.arkive.org/ – (BBC Natural History Unit)

  • American Beaver – Overview
  • American Beaver in the Lodge with Young
  • American beaver felling trees and storing food for the winter
  • American beaver scaring moose away from its lodge
  • American beaver returning to its lodge with food

  • Collen, P. and R.J. Gibson. 2001. The general ecology of beavers (Castor spp.), as related to their influence on stream ecosystems and riparian habitats, and the subsequent effects on fish – a review. Reviews in Fish Biology and Fisheries 10: 439–461, 2001. https://www.researchgate.net/publication/227028536_The_general_ecology_of_beavers_Castor_spp_as_related_to_their_influence_on_stream_ecosystems_and_riparian_habitats_and_the_subsequent_effects_on_fish_-_A_review [ Accessed May 1, 2010]

    Prettyman, B. 2009. Utah wildlife: Leave it to the beavers. Article in Salt Lake Tribune, October 16, 2009. https://www.sltrib.com/ci_13570110 [ Accessed April 29, 2010]

    Smithsonian Castor Canadensis Information Page https://www.mnh.si.edu/mna/image_info.cfm?species_id=32 [ Accessed April 29, 2010]

    Big Bend Habitat Restoration Project: A Natural Work of Heart, Open Spaces-A Talk on the Wild Side, US FWS, https://www.fws.gov/news/blog/index.cfm/2016/3/25/Big-Bend-Habitat-Restoration-Project-A-Natural-Work-of-Heart [Accessed March 31, 2016]

    Beaver Dams Strengthened by Humans Help Fish Rebound
    60-Second Science – July 25, 2016 – By Jason G. Goldman02:29 https://www.scientificamerican.com/podcast/episode/beaver-dams-strengthened-by-humans-help-fish-rebound/ Also available through the podcast https://itunes.apple.com/us/podcast/60-second-science/id189330872?mt=2

    A Modern Day Phoenix

    “Phoenix,” an immature Golden Eagle
    Aquila chrysaetos
    Courtesy Wildlife Rehabilitation Center of Northern Utah (WRCNU.org)

    Elk Bath
    From a 2000 fire in the
    Bitterroot National Forest in Montana

    Courtesy Wikimedia &
    USDA Forest Service
    John McColgan, Photographer

    Hi, I’m Holly Strand.

    You may have heard about the golden eagle nestling that was badly burned during a recent Utah wildfire. Its nest was totally destroyed, but the little eagle had fallen to the ground and survived. After the fire, he was found by Kent Keller, a volunteer for Utah’s Div. of Natural Resources, who had banded the young eagle a month before. The eagle was dehydrated—his feathers, face, and feet were badly burned. So Keller obtained a permit from wildlife officials to intervene. Now in the care of the Wildlife Rehabilitation Center of Northern Utah the eagle is recovering rapidly. Even so, it will take a while for the damaged feathers to be replaced by healthy new ones. Phoenix–as is he was aptly named–won’t learn to fly for at least another year.

    With this and other fire-related stories in the news, I‘ve been wondering about the fate of animals caught in wildfires. Scientific observations of animal behavior during fire events are rare. But by conducting post-fire surveys, and comparing results with unburned areas, some researchers have been able to piece together an idea of who survives, who dies and who thrives.

    Obviously, faster and more mobile animals have the advantage. Birds can fly away and most mammals can outrun the spreading flames. Spring fires can be disastrous, destroying birds who haven’t fledged –like Phoenix– or mammals who are still too immature to escape. Fortunately, fires are more frequent in mid to late summer when little ones have matured.

    If a fire moves through an area quickly, without superheating the ground, dormant animals or those hiding in burrows can survive. The surrounding soil provides plenty of insulation. Soil also protects most soil macrofauna and the pupae of many insects.

    Animals that live their lives totally or partially in the water may not suffer at all during a fire. However, smaller bodies of water, such as streams, can quickly heat up fairly quickly. Oxygen loss is a problem as well. And fire-fighting chemicals dumped from the air can end up in water, killing fish, frogs and other animals.

    Indirectly, the alteration of habitat by fire can also restructure animal populations. Interestingly, there are quite a lot of animals that benefit from post-fire habitats. For example, the insect population above ground may plummet during a fire, but then increase above pre-fire levels when fresh young plants start to grow back. Burned trees are attractive to certain beetles as breeding sites. An increase in beetles is a windfall for the woodpeckers that devour them. Swallows and flycatchers use burned dead trees as perch sites. They survey from on high and then swoop to catch their insect dinner. Seed eating birds like Clark’s Nutcracker, gobble up conifer seeds when cones open in response to fire.

    Among mammals, ground squirrels, pocket gophers and deer mice generally increase after severe fires. Even large herbivores such as pronghorn or deer may benefit from the increased food and nutrition on recent burns. In turn, predators of these creatures enjoy a bumper crop as well.

    For images of Phoenix the recovering golden eagle and a link to the Wildlife Rehabilitation Center of Northern Utah go to www.wildaboututah.org.

    For Wild About Utah, I’m Holly Strand.

    Credits:

    Images: Courtesy Wikimedia, Louis Agassiz Fuertes, Gavin Keefe Schaefer and Dave Menke, US FWS images.fws.gov
    Text: Holly Strand

    Sources & Additional Reading:


    Baker, William L. 2009. Fire ecology in Rocky Mountain Landscapes. Washington, DC: Island Press.https://islandpress.org/ip/books/book/islandpress/F/bo7019409.html

    Bradley, Anne F.; Noste, Nonan V.; Fischer, William C. 1992. Fire ecology of forests and woodlands in Utah. Gen. Tech. Rep. INT-287. Ogden, UT: U.S. Department of Agriculture, Forest Service, Intermountain Research Station. https://www.fs.fed.us/rm/pubs_int/int_gtr287.pdf

    Hutto, RL. 1995. Composition of bird communities following stand-replacement fires in northern Rocky-Mountain (USA) conifer forests in Conservation Biology Volume: 9 Issue: 5 Pages: 1041-1058 https://www.fsl.orst.edu/ltep/Biscuit/Biscuit_files/Refs/Hulto%20CB1995%20fire%20birds.pdf

    Wildlife Rehabilitation Center of Northern Utah https://wrcnu.org/

    Utah Prairie Dogs

    Three Utah Prairie Dogs
    Cynomys parvidens
    Courtesy US NPS, Bryce Canyon NP

    White-tailed Prairie Dog
    Cynomys leucurus
    Courtesy US FWS
    Rhonda Foley, Photographer

    Throughout certain areas in southwestern Utah, construction is currently underway. New neighborhoods and subdivisions are being worked on daily, with mounds of dirt displaced. But this isn’t your typical suburban development. Its inhabitants are only 12 inches tall and furry.

    The Utah prairie dog is the westernmost of five prairie dog species in the US and is unfortunately the most threatened. Since 1973 it has been a regular feature on the endangered species list, though it was downgraded to ‘threatened’ in 1984 and populations continue to show signs of growth.

    Utah prairie dogs are very social creatures, living in large groups called colonies or towns which consist of hundreds or even thousands of individuals and their vast networks of underground burrows. While the group forages for grasses, seeds, leaves, and insects, colony guards or lookouts take turns watching for danger. If a hazard is identified, loud barks echo throughout the colony and foraging dogs run for cover.

    Earlier this spring, Utah Prairie dogs in Parowan made national news when the town started construction on a $300,000 fence to keep these industrious critters from burrowing under and buckling the local airport’s runway. Their threatened status means special care must be taken in removing the dogs from airport property and relocating them to nearby public lands. Airport personnel waited until the beginning of July, after this year’s offspring had matured and left home, to begin the specialized trapping and relocation process.

    While some consider prairie dogs and their digging habits to be a nuisance, these diminutive creatures are an incredibly important part of their ecosystem. Ecologists have a name for organisms whose role is disproportionately large – a keystone species. In architecture, a keystone is the uppermost piece in an arch – the one on which all the other stones lean. Ecologically speaking a keystone species is one that supports many others that live around it.

    It has been estimated that more than 170 species – many of them also threatened or endangered – depend in some way on the Utah prairie dog, generally for either food or shelter. For example, the quirky and unique burrowing owl depends upon abandoned prairie dog homes for constructing its underground nests. Black – footed ferrets, whose population was at one time reduced to only 18 individuals, inhabit abandoned burrows within a large prairie dog colony and rely almost 100% upon the rodents for food.

    Other animals that are linked to the Utah prairie dog include badgers, coyotes, sage grouse, Swainson’s hawks, and kit foxes. Like its architectural counterpart, if an ecological keystone is removed the whole system is prone to collapse. Thankfully, with a species recovery plan in place, and a dedicated inter-agency group of supporters, the Utah prairie dog’s housing market continues to boom.

    Thank you to the Rocky Mountain Power Foundation for supporting the research and development of this Wild About Utah topic.

    For the Stokes Nature Center and Wild About Utah, this is Andrea Liberatore.

    Credits:
    Images: Courtesy & US FWS, images.fws.gov
                Courtesy US NPS, https://www.nps.gov/brca/naturescience/upd.htm

    Text:     Andrea Liberatore, Stokes Nature Center in Logan Canyon.


    Additional Reading:

    Hengesbaugh, M.G. (2001) Creatures of Habitat: The Changing Nature of Wildlife and Wild Places in Utah and the Intermountain West. Utah State University Press: Logan, UT,

    U.S. Fish & Wildlife Service – Mountain-Prairie Region. (2012) Endangered Species: Utah Prairie Dog. Available online at: https://www.fws.gov/mountain-prairie/species/mammals/UTprairiedog/

    National Park Service – Bryce Canyon National Park, Utah. (2012) Utah Prairie Dog. Available online at: https://www.nps.gov/brca/naturescience/upd.htm

    Carlton, J. (2012) In Utah, A Town Digs Deep to Battle Prairie Dogs. Wall Street Journal, May 6 2012. Available online at: https://online.wsj.com/article/SB10001424052702304020104577384642186959960.html

    Who’s Afraid of the Big Bad Wolf?

    Who’s Afraid of the Big Bad Wolf: Yellowstone Gray Wolf, Photo Courtesy US FWS. Tracy Brooks, Photographer
    Yellowstone Gray Wolf(Canis lupus)
    Photo Courtesy US FWS
    Tracy Brooks, Photographer

    Who’s Afraid of the Big Bad Wolf: Yellowstone Gray Wolf with Radio Collar, Photo Courtesy US FWS, William Campbell, PhotographerYellowstone Gray Wolf(Canis lupus)
    With Radio Collar
    Photo Courtesy US FWS
    William Campbell, Photographer

    Hi, I’m Holly Strand.

    In January, a movie called “the Grey” briefly flashed across theater screens. The plot pits man against nature: after a plane crash in the Alaskan wilderness, 7 men struggle to return civilization. In the process, the group is whittled down one by one, victims of ferocious and hungry wolves.

    Author Barry Lopez says the wolf as human predator is a theme that runs deep into the human psyche. Thus, this movie is just the latest in a long line of wolf eats man stories. Little Red Riding Hood maybe the most famous example. Aesop’s fables are full of wolves with questionable intentions. The tale that chills me the most is a flashback within Willa Cather’s My Ántonia. Riding sleds in a snowstorm, an entire wedding party is attacked and then devoured by a pack of hungry wolves, the bride screaming in terror until she is taken down and finished off….. Ugh.

    On the other hand we have legends and accounts that praise the wolf as noble and even familial. Many native American groups revered the wolf for its strength and survival skills.

    The founders of Rome, Romulus and Remus were supposedly raised by wolves, as was Mowgli in Rudyard Kipling’s Jungle Book. In 1963 Farley Mowat published Never Cry Wolf, which led many people to see wolves in a more sympathetic light.

    So how do wolves regard humans? Are we a creature to be avoided or are we dinner entrees?

    Not long ago, a team of researchers examined the data on wolf attacks from a handful of European countries plus North America. From these records they drew the following conclusions:

    1. The majority of attacks on humans involve wolves with rabies.
    2. Among non-rabid attacks, most victims were children, and to a lesser extent, adult women.
    3. When wolves lose their fear of humans, attacks increase dramatically.
    4. Wolf–dog hybrids are innately less fearful of humans, making them extremely dangerous.
    5. And lastly—and not surprisingly—provoking a wolf is likely to incite an attack. Cornering a wolf or entering a den with pups is not a good idea.


    The study also confirmed that the number of attacks on humans has dropped dramatically in the last century. This is not just because there are fewer wolves. It’s that the situations leading to attacks are not common anymore:

    For instance, the incidence of rabies has dropped dramatically in North America and Europe.

    And we no longer send our children out alone to tend sheep or other livestock, an invitation for a wolf attack.

    Another factor is that legislation has curtailed the breeding of wolf-dog hybrids. Now 40 U.S. states effectively forbid the ownership, breeding and importation of wolf-dogs, while others impose some form of regulation upon ownership.

    In summary, the consensus of wolf specialists is that under normal circumstances people aren’t on the wolf’s menu. Bears, cougars, tigers and other large carnivores are more likely to attack humans.

    For Wild About Utah, I’m Holly Strand.


    Credits:

    Images: Courtesy US FWS https://images.fws.gov
    Text: Holly Strand

    Sources & Additional Reading:


    Carnahan, Joe. Director. 2012. The Grey https://www.imdb.com/title/tt1601913/

    Linnell, J.D.C., R. Andersen, Z. Andersone, L. Balciauskas, J.C. Blanco, L. Biotani, S. Brainerd, U. Breitenmoser, I. Kojola, O. Liberg, J. Loe, H. Okarma, H. Pedersen, C. Promberger, H. Sand, E. Solberg, H. Valdmann, P. Wabakken. 2002. The fear of wolves: A review of wolfs attacks on humans. NINA Oppdragsmelding: 731:1-65. https://www.lcie.org/docs/damage%20prevention/linnell%20nina%20op%20731%20fear%20of%20wolves%20eng.pdf

    Löe J. and E. Röskaft. 2004. Large Carnivores and Human Safety: A Review. AMBIO: A Journal of the Human Environment Aug 2004 : Vol. 33, Issue 6, pg(s) 283-288

    Lopez, Barry. 2004. Of Wolves and Men. Twenty-fifth anniversary edition, Scribner.

    Mech, L. David. 1991. The way of the wolf. Voyageur Press, Stillwater, MN

    Palamar, Colette. A History of Attitudes Toward Wolves. University of Idaho.

    https://www.class.uidaho.edu/kpgeorge/issues/wolves_history/history_symbol.htm [accessed April 18, 2012]

    Silver, Marc. 2012. Would Real Wolves Act Like the Wolves of ‘The Grey’? National Geographic interview of Daniel MacNulty, Utah State University. [accessed April 18, 2012]