Author: Mark Larese-Casanova

Mark is the Master Naturalists program director with Utah State University Cooperative Extension.
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Tracking Wildlife in Winter

Jumping Mouse Tracks
Photo Courtesy & Copyright 2011
Mark Larese-Casanova

Moose Tracks in Snow
Photo Courtesy & Copyright 2011
Mark Larese-Casanova

Cottontail Rabbit Browse & Scat
Photo Courtesy & Copyright 2011
Mark Larese-Casanova

Hi, this is Mark Larese-Casanova from the Utah Master Naturalist Program at Utah State University Extension.

The cold depth of winter is a time when many animals are hiding- either hibernating until the thaw of spring, or finding shelter and warmth in burrows, under logs, or in the tangled branches of evergreen trees.

However, snow falls in much of Utah, and even a dusting can reveal the stories of wildlife in winter. It’s a bit like solving a mystery. By reading the clues of animal tracks, we can know not only the type of animal that made them, but also where they were going and what they were doing.

The most obvious clue is the size of a track. Smaller animals make smaller tracks, and also sets of tracks that are generally closer together.

The shape of an animal track is also very revealing. Members of the canine family, including domestic dogs, coyotes, and fox, show four toes in front, each with a visible claw. Felines, including bobcats and mountain lions, also show four toes, but no claws. Tracks from members of the weasel family, such as mink, ermine, and skunks, show five toes, each with a claw. Raccoon, squirrel, and mouse tracks almost look like they were made by tiny human hands. The long tails of some animals, including deer mice, jumping mice, and weasels, often leave a characteristic line through the center of a set of tracks.

Combining the size and shape of tracks reveals further details about wildlife. The three inch long cloven hoof print of a mule deer is easily recognizable. An elk track looks almost identical, but is about four inches long. A similar moose track is even larger at six inches long.

Figuring out which animal made a track is only half of the story. If we follow tracks, we’ll surely find clues about an animal’s daily life. Wildlife often gather around sources of water that aren’t frozen, which are critical to winter survival. Perhaps rabbit tracks lead under a spruce tree where browsed branches and droppings indicate a frequent feeding spot. Maybe mouse tracks lead from tree to rock to log as it avoids owls and hawks.

While we are much more likely to see wildlife during the warmer months, winter gives us a chance to unravel the story of daily survival during the most difficult time of the year in Utah.

For Wild About Utah, I’m Mark Larese-Casanova.

Credits:
Images: Courtesy and Copyright Mark Larese-Casanova
Text:     Mark Larese-Casanova

Additional Reading:

Canadian Wildlife Federation: Tracking Down Winter Wildlife. https://www.cwf-fcf.org/en/action/how-to/outside/tracking-down-winter-wildlife.html

Murie, O. J. (1982). Animal Tracks. Peterson Field Guides. New York, NY: Houghton Mifflin. https://www.amazon.com/Peterson-Field-Guide-Animal-Tracks/dp/061851743X

Vermont Nature and Outdoors: Tracking Winter Wildlife. https://www.ruralvermont.com/vermontweathervane/issues/winter/97012/vins97012_tracking.shtml

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Mule Deer

Mule Deer Herd
Odocoileus hemionus
Photo Courtesy US FWS

Mule Deer Herd
Odocoileus hemionus
Photo Courtesy US FWS
Gary Zahm, Photographer

Mule Deer Herd
Odocoileus hemionus
Photo Courtesy US FWS
David Heffernan, Photographer

Hi, this is Mark Larese-Casanova from the Utah Master Naturalist Program at Utah State University Extension.

It’s that time of year again, the leaves have fallen from the trees, the snowy holidays are on their way, and love is in the air for one of Utah’s vital wildlife species. Odocoileus hemionus, commonly known as Mule Deer are the smallest members of the Cervid family in Utah, after moose and elk. Their name is derived from their large ears which resemble those of a mule.

Mule deer have a coat that ranges from dark grey, to a lighter tan color, a white rump patch, and tail with a black tip.

In the months of November and December Mule deer are active in their breeding season known as the rut. During the summer and early fall males will typically live away from does and fawns, and begin to “play” fight with other males to establish a hierarchy of dominance. Once the rut begins males will seek out does, and become more aggressive and compete with one another for females to breed with. The less dominant males are usually aware of their status, and will be chased away by larger bucks. However males that are similar in size will posture to one another, lock antlers and fight to establish breeding rights with the doe.

Mule deer are not monogamous in nature. Males will breed with any female that will accept them. Does can also breed with multiple bucks, providing the possibility of multiple births from different fathers. The receptive period for does is known as estrus, and typically lasts for less than a day, and sometimes only a few hours. If the first estrus cycle is missed does can go through another cycle in about four weeks. When the rut comes to an end, bucks will return to being solitary until they shed their antlers in late winter.

In Utah, does typically give birth in June and will leave the herd to be alone. The older does commonly have twins, while younger does have only one fawn. After the fawns are born the cycle of life starts again.

For Wild About Utah, I’m Mark Larese-Casanova.

Credits:

Images: Courtesy US FWS, Gary Zahn and David Heffernan, Photographers
Text:     Mary Jackson, Justin Hicken, Utah State University

Additional Reading:

LEARN MORE, Find out more about mule deer and what the DWR is doing to help them, Utah Division of Wildlife Resources, Department of Natural Resources, State of Utah, https://wildlife.utah.gov/16-wildlife.html?start=14

Ongoing Efforts to Help Utah’s Deer Herds, Utah Division of Wildlife Resources, Department of Natural Resources, State of Utah, https://wildlife.utah.gov/md-help.html

Mule Deer Statewide Management Plan, Utah Division of Wildlife Resources, Department of Natural Resources, State of Utah, https://wildlife.utah.gov/pdf/bg/mule_deer_plan.pdf

Mule Deer, Utah Species, Utah Division of Wildlife Resources, Department of Natural Resources, State of Utah, https://fieldguide.wildlife.utah.gov/?species=odocoileus%20hemionus

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Cheatgrass

Click to view an article about cheatgrass, Cheatgrass Photo Courtesy NPS, Photographer Tom Heutte, USDA Forest Service, Bugwood.org
Cheatgrass
Photo Courtesy NPS, Photographer:
Tom Heutte, USDA Forest Service,
Bugwood.org

Click to view an article about cheatgrass, Photo Courtesy NPS, Neal Herbert, PhotographerA grassland inundated by cheatgrass
Photo Courtesy NPS
Neal Herbert, Photographer

Hi, this is Mark Larese-Casanova from the Utah Master Naturalist Program at Utah State University Extension.

It’s difficult to visit a landscape in the West without encountering cheatgrass. While cheatgrass’ small stature might make it hard to notice, it’s impossible to forget its sharp, spiny seeds. One hike through a cheatgrass meadow can render a good pair of socks unsalvageable.

Although cheatgrass, a nonnative grass scientifically known as Bromus tectorum, is an annual grass- germinating, growing, producing seeds, and dying each year- it is particularly effective at colonizing disturbed areas because it grows and produces seeds much earlier in the spring than many perennial native grasses. Cheatgrass monopolizes water and nutrients by germinating and establishing itself during the previous fall and winter, when many native plants have become dormant. Over time, “cheat grass” has become the dominant ground cover in many of Utah’s sagebrush ecosystems.

The dense, dry, fine stalks of cheatgrass, which sets seeds and dries out by June, are particularly flammable fuel for wildfires. Fire roars through the carpet-like cover of cheatgrass, and wildfires are now at least twice as frequent as they were in the 1800’s. This has caused a loss of sagebrush habitat that is particularly important to a wide diversity of wildlife. More frequent fires create an even greater challenge for rare species such as the black-footed ferret and desert tortoise to survive. Native grasses are slower to recover from fire, and cheatgrass is particularly effective at recolonizing burned areas. Utah State University researchers Dr. Peter Adler and Aldo Compagnoni have found that reduced snowpack and warmer temperatures promote the growth of cheatgrass, which could potentially increase its distribution and fire risk into previously colder areas of Utah.

Researchers and managers are continually working to find ways to control cheatgrass in Utah. Effective control usually involves a combination of mechanical pulling or tilling, grazing, burning, spraying with a chemical herbicide, and replanting with native grasses. USU researchers Dr Eugene Schupp and his former graduate student Jan Summerhays found that applying a pre-emergent herbicide to prevent the germination of cheatgrass seeds, as well as temporarily limiting Nitrogen in the soil, gave native grasses and perennials a better chance of establishing. When faced with such a large management problem in Utah and throughout the West, we can use all of the helpful tools we can get.

For Wild About Utah, I’m Mark Larese-Casanova.

Credits:

Images: Courtesy NPS, Neal Herbert Photographer, NPS,
and USDA Forest Service, Bugwood.org, Tom Heutte Photographer
Text: Mark Larese-Casanova, Utah Master Naturalist Program at Utah State University Extension.

Additional Reading:

Beck, George. Cheat grass and Wildfire. Fact Sheet No. 6.310. Colorado State University Extension. https://www.ext.colostate.edu/pubs/natres/06310.html

Range Plants of Utah. USU Extension, Utah State University, https://extension.usu.edu/rangeplants/grasses-and-grasslikes/cheatgrass

Fairchild, John. Cheat grass: threatening homes, stealing rangelands. Utah Division of Wildlife Resources. https://wildlife.utah.gov/watersheds/links/cheatgrass.php

Opsahl, Kevin. USU study: Climate shift could trigger Cheat Grass. Herald Journal . October 21, 2012. https://news.hjnews.com/allaccess/article_f1436aee-1a3c-11e2-935a-0019bb2963f4.html

Forero, Leslie, Plants Surviving Cheat Grass Invasion May Improve Restoration Chances, Study Shows, UPR Utah Public Radio, Feb 26, 2018 https://www.upr.org/post/plants-surviving-cheatgrass-invasion-may-improve-restoration-chances-study-shows

Cane, James, Reseeding the West After Fire, Wild About Utah, November 29,2012, https://wildaboututah.org/reseeding-the-west-after-fire/

Strand, Holly, American Invasion, Wild About Utah, September 18,2014, https://wildaboututah.org/american-invasion/

Grant, Val, Short-tailed Bird of Perdition-Starlings, Wild About Utah, June 05,2009, https://wildaboututah.org/short-tailed-bird-of-perdition-starlings/

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Utah’s Glacial History

Moraine with erratics, Photo Courtesy and Copyright Mark Larese-Casanova, Photographer
Moraine with erratics
Photo Courtesy & Copyright
Mark Larese-Casanova, Photographer

Little Cottonwood Canyon, Photo Courtesy and Copyright Mark Larese-Casanova, PhotographerLittle Cottonwood Canyon
Photo Courtesy & Copyright
Mark Larese-Casanova, Photographer

Hi, this is Mark Larese-Casanova from the Utah Master Naturalist Program at Utah State University Extension.

It is amazing to see just how much of an impact the large amount of snowfall from last winter still has on the annual cycle of nature. Of recent note, wildflower blooms in the mountains seem to be at least 2-3 weeks behind normal schedule. Hiking through snow in late July had me thinking about colder times when Utah’s mountains were covered with ice that flowed as glaciers.

The most recent period of glaciation in Utah occurred between 30,000 and 15,000 years ago when Utah’s climate was, on average, up to 30?F cooler. At times during this period, much of the western half of Utah was covered by Lake Bonneville, which contributed tremendous amounts of moisture as snow throughout Utah’s mountain ranges. As the snow accumulated at high elevations, its sheer weight caused it to recrystallize into ice. Once the masses of ice became heavy enough, gravity pulled them down slope, carving out characteristic U-shaped valleys.

At the top of the valleys, where the glaciers formed, we can often find large, bowl-shaped cirques. In the Wasatch Range, the Little Cottonwood Canyon glacier formed at the top, creating Albion Basin, and reached the mouth of the canyon where calved icebergs into Lake Bonneville. The Uinta Mountains contained such large glaciers that even many of the mountain peaks are rounded.

As temperatures warmed during the end of the last ice age, glaciers receded and left behind large piles of soil and rocks, known as moraines. Terminal moraines at the end of a glacier’s path, can act as natural dams to create lakes. Enormous boulders, known as glacial erratics, can often be found discarded along canyons.

While glaciers don’t currently exist in Utah, there are several permanent snowfields in shaded high mountain areas. So, if you’re feeling a little nostalgic and missing that extra long winter we had this year, you still a chance to hike up above 9,000 feet and cool your toes in the snow.

For Wild About Utah, I’m Mark Larese-Casanova.

Credits:

Images: Courtesy & Copyright Mark Larese-Casanova
Text:     Mark Larese-Casanova, Utah Master Naturalist Program at Utah State University Extension.

Additional Reading:

Utah Geological Survey https://geology.utah.gov/surveynotes/gladasked/gladglaciers.htm

Parry, William T. 2005. A Hiking Guide to the Geology of the Wasatch and Uinta Mountains. University of Utah Press.

Stokes, William Lee. 1986. Geology of Utah. Utah Museum of Natural History.