Mount Graham red squirrel

Last updated

Contents

Mount Graham red squirrel
Mt. Graham Red Squirrel.jpg
Status TNC T1.svg
Critically Imperiled  (NatureServe) [2]
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Rodentia
Family: Sciuridae
Genus: Tamiasciurus
Species:
Subspecies:
T. f. grahamensis
Trinomial name
Tamiasciurus fremonti grahamensis
(J. A. Allen, 1894)
Synonyms

Tamasciurus hudsonicus grahamensis

The Mount Graham red squirrel (Tamiasciurus fremonti grahamensis) is an endangered subspecies of the southwestern red squirrel (Tamiasciurus fremonti) [3] native to the Pinaleño Mountains of Arizona. It is smaller than most other subspecies of red squirrel, and also does not have the white-fringed tail that is common to the species. Its diet consists mainly of mixed seeds, conifer cones and air-dried fungi. It exhibits similar behavior to other squirrels in its species.

Description

Physical

The Mount Graham red squirrel is a generally tiny squirrel weighing on average around 8 ounces (230 g) and measuring about 8 inches (20 cm) in length. [1] The subspecies also has a 6 inches (15 cm) tail. [1] Unlike most other squirrels in its species, the squirrels do not have a white-fringed tail. [1] Both females and males share similar markings and features and are typically grayish brown in color with rusty yellow or orange markings on their backside. [1] During the winter season, the squirrels ears are tufted with fur, and during the summer a black lateral line is observed on the squirrel. [1] [4] The skull of the subspecies is rounded and its teeth are low-crowned. [4]

Behavior

Mount Graham red squirrels behave in a manner similar to most other subspecies of American red squirrel. They are diurnal and do not hibernate during the winter months, but instead carry out activities in the mid-day sun. [5] Mount Graham squirrels usually eat a diet of mixed seeds, conifer cones and air-dried fungi. [6]

Habitat

Historically, the Mount Graham red squirrel inhabited about 11,750 acres (47.6 km2) of spruce-fir, mixed-conifer and ecotone zone habitats that were generally at higher elevations throughout the Pinaleño Mountains. [6] Recent data shows that it occurs more frequently at the ecotone zone than the other habitats. [6] When choosing a potential nesting site, the squirrels typically pick a cool, moist area with an abundance of food sources. [6] Drought, forest fires, and insect infestation have been responsible for a decrease of the squirrel in the spruce-fir habitat. [6]

Conservation

The Mount Graham subspecies was believed to be extinct in the 1950s, but was "rediscovered" in the 1970s. [7] After its rediscovery, it was suggested for threatened or endangered species status under the Endangered Species Act in 1982. [8] On May 21, 1986, the subspecies was officially recommended to become an endangered species, and on June 3, 1987, was officially listed as endangered. [1] [9] The Mount Graham International Observatory was controversial when it was built in the squirrel's habitat; the observatory has been required to monitor the community near the observatory to determine if its construction is having any negative effects on the population. [7] Habitat loss is also occurring at high levels for a variety of natural and anthropogenic reasons. [7] In 1988, the U.S. Fish and Wildlife Service designated most of this area as a refuge, and access to the area is granted only with a special permit. [7] A lightning strike on June 7, 2017, started a wildfire that could have led to the extinction of this subspecies. [10]

In September 2019, the U.S. Fish and Wildlife Service agreed to consider if the squirrel needed further protection. They were petitioned under a procedure of the Endangered Species Act by a group that contends it is necessary to remove the observatory and other private structures. [11]

Related Research Articles

<span class="mw-page-title-main">Douglas fir</span> Species of tree

The Douglas fir is an evergreen conifer species in the pine family, Pinaceae. It is native to western North America and is also known as Douglas-fir, Douglas spruce, Oregon pine, and Columbian pine. There are three varieties: coast Douglas-fir, Rocky Mountain Douglas-fir and Mexican Douglas-fir.

<span class="mw-page-title-main">Pine squirrel</span> Genus of rodents

Pine squirrels are squirrels of the genus Tamiasciurus, in the Sciurini tribe, of the large family Sciuridae.

<span class="mw-page-title-main">Mount Graham</span> Mountain in Arizona, United States

Mount Graham is a mountain in Graham County, Arizona, United States, approximately 70 miles (110 km) northeast of Tucson. The mountain reaches 10,724 feet (3,269 m) in height. It is the highest elevation in Graham County, Coronado National Forest and the Pinaleño Mountains. It is also the southernmost peak and land area in the continental United States above 10,000 feet (3,048 m). As the name "Mount Graham" is often used by locals to refer to the entire mountain range, the peak itself is frequently referred to as "High Peak". It is twentieth of the 57 ultra-prominent peaks of the lower 48 states, and the first of the five in Arizona.

<span class="mw-page-title-main">Douglas squirrel</span> Species of rodent

The Douglas squirrel is a pine squirrel found in western North America, from the Pacific Northwest to central California, with an isolated subspecies in northern Baja California, Mexico. It is sometimes known as the chickaree or pine squirrel, although these names are also used for the American red squirrel. Variant spellings of the common name are Douglas' squirrel and Douglas's squirrel. The Native Americans of Kings River called it the "Pillillooeet", in imitation of its characteristic alarm call.

<span class="mw-page-title-main">American red squirrel</span> Species of pine squirrel found in North America

The American red squirrel is one of three species of tree squirrels currently classified in the genus Tamiasciurus, known as the pine squirrels. The American red squirrel is variously known as the pine squirrel or piney squirrel, North American red squirrel, chickaree, boomer, or simply red squirrel. The squirrel is a small, 200–250 g (7.1–8.8 oz), diurnal mammal that defends a year-round exclusive territory. It feeds primarily on the seeds of conifer cones, and is widely distributed across much of the United States and Canada wherever conifers are common, except in the southwestern United States, where it is replaced by the formerly conspecific southwestern red squirrel, and along the Pacific coast of the United States, where its cousin the Douglas squirrel is found instead.

<span class="mw-page-title-main">Abert's squirrel</span> Species of rodent

Abert's squirrel or the tassel-eared squirrel is a tree squirrel in the genus Sciurus native to the southern Rocky Mountains from the United States to the northern Sierra Madre Occidental of Mexico, with concentrations found in Arizona, New Mexico, and southwestern Colorado. It is closely associated with, and largely confined to, mature ponderosa pine forests. It is named in honor of the American naturalist John James Abert; nine subspecies are recognised. It is recognizable by its tufted ears, gray color, pale underparts and rufous patch on the lower back. The squirrel feeds on the seeds and cones of the Mexican pinyon and the ponderosa pine when they are available, but will also take fungi, buds, bark, and carrion. Breeding normally occurs in summer, with a spherical nest being built high in the canopy.

<i>Hesperocyparis abramsiana</i> Californian species of western cypress

The Santa Cruz cypress is a species of North American tree within the cypress family. The species is endemic to the Santa Cruz Mountains within the Santa Cruz and San Mateo counties of west-central California. The U.S. Fish and Wildlife Service listed the species on the Endangered Species Act in 1987 due to increasing threats from habitat loss and disruption of natural forest fire regimes. In 2016, the conservation status of the Santa Cruz cypress changed to Threatened. The cited reasoning was a decrease in threats against their habitat.

<span class="mw-page-title-main">Pinaleño Mountains</span> Mountain range in southeastern Arizona, United States

The Pinaleño Mountains, are a remote mountain range in southeastern Arizona, near Safford, Arizona. The mountains have over 7,000 feet (2,100 m) of vertical relief, more than any other range in the state. The mountains are surrounded by the Sonoran-Chihuahuan Desert. Subalpine forests cover the higher elevations. According to The Nature Conservancy, they traverse five ecological communities and contain "the highest diversity of habitats of any mountain range in North America." The highest point is Mount Graham at 10,720 feet (3,267 m). Locals often refer to the whole mountain range as "Mount Graham", in which case the peak is referred to as "High Peak". The mountains cover 300 square miles (780 km2) and are part of the Coronado National Forest, Safford ranger district.

<span class="mw-page-title-main">Mexican fox squirrel</span> Species of rodent

The Mexican fox squirrel is a species of tree squirrel found throughout the Sierra Madre Occidental of Mexico as far south as Jalisco — and northward into the Chiricahua Mountains of southeastern Arizona, U.S.

<span class="mw-page-title-main">Mearns's squirrel</span> Subspecies of rodent

Mearns's squirrel is a subspecies of the Douglas squirrel endemic to Mexico. It is endangered and occurs in low densities, and is threatened by habitat loss. It is possibly also threatened by competition from the eastern gray squirrel, which was introduced to the range of Mearns's squirrel in 1946, but may not be present anymore. It is closely related to other subspecies of the Douglas squirrel, but far less is known about its behavior, which was first studied in detail in 2004. It is named for the 19th-century American naturalist Edgar Mearns.

<span class="mw-page-title-main">Wapack National Wildlife Refuge</span>

Wapack National Wildlife Refuge is a National Wildlife Refuge of the United States located in southern New Hampshire. It was the state's first refuge and was established through a donation by Lawrence and Lorna Marshall in 1972. The 1,672-acre (677 ha) refuge is located about 20 miles (32 km) west of Nashua, New Hampshire and encompasses the 2,278-foot (694 m) North Pack Monadnock Mountain.

<span class="mw-page-title-main">Eastern Great Lakes lowland forests</span> Temperate broadleaf and mixed forest ecoregion of Canada and the United States

The Eastern Great Lakes lowland forests is a temperate broadleaf and mixed forest ecoregion of North America, as defined by the World Wildlife Fund. It lies mostly in south and eastern Ontario and Quebec in Canada, and Upstate New York and Vermont in the United States.

<span class="mw-page-title-main">Ecology of the Rocky Mountains</span> Ecology of the Rocky Mountain range in North America

The ecology of the Rocky Mountains is diverse due to the effects of a variety of environmental factors. The Rocky Mountains are the major mountain range in western North America, running from the far north of British Columbia in Canada to New Mexico in the southwestern United States, climbing from the Great Plains at or below 1,800 feet (550 m) to peaks of over 14,000 feet (4,300 m). Temperature and rainfall varies greatly also and thus the Rockies are home to a mixture of habitats including the alpine, subalpine and boreal habitats of the Northern Rocky Mountains in British Columbia and Alberta, the coniferous forests of Montana and Idaho, the wetlands and prairie where the Rockies meet the plains, a different mix of conifers on the Yellowstone Plateau in Wyoming, the montane forests of Utah, and in the high Rockies of Colorado and New Mexico, and finally the alpine tundra of the highest elevations.

<span class="mw-page-title-main">John L. Koprowski</span> American biologist

John L. Koprowski, Dean and Professor, Haub School of Environment & Natural Resources, University of Wyoming, mammalogist, conservation biologist, and leading expert on the ecology and conservation of wildlife, especially squirrels, was born in 1961 in Lakewood, Ohio.

<span class="mw-page-title-main">Southwestern red squirrel</span> Species of tree squirrel

The southwestern red squirrel or Fremont's squirrel is a species of tree squirrel endemic to high-altitude regions of the southwestern United States.

<span class="mw-page-title-main">Frye Fire</span> 2017 wildfire in Arizona, United States

The Frye Fire was a wildfire that burned 48,443 acres (19,604 ha) in Graham County, Arizona, United States, from June 7 to September 1, 2017. The fire was ignited by a lightning strike on Mount Graham, within the Coronado National Forest, and spread rapidly until it was mostly contained on July 12. The Frye Fire destroyed three buildings, briefly threatened the Mount Graham International Observatory, cost $26 million to contain and suppress, and involved more than 800 firefighters. There were no fatalities, but 63 firefighters were quarantined as a result of a strep throat outbreak.

References

  1. 1 2 3 4 5 6 7 "Mount Graham Red squirrel (Tamiasciurus hudsonicus grahamensis)". U.S. Fish and Wildlife Service. Retrieved 10 April 2010.
  2. "NatureServe Explorer 2.0". explorer.natureserve.org. Retrieved 7 October 2022.
  3. "Explore the Database". www.mammaldiversity.org. Retrieved 2021-09-11.
  4. 1 2 Fitzpatrick, Lesley; Genice Froehlich; Terry Johnson; Randall Smith; Barry Spicer (May 3, 1993). "Mount Graham red squirrel" (PDF). U.S. Fish and Wildlife Service Albuquerque, New Mexico. Retrieved 10 April 2010.
  5. "The Natural History of the Mount Graham Red Squirrel". The University of Arizona. Retrieved 13 September 2012.
  6. 1 2 3 4 5 "Mount Graham Red Squirrel (Tamiasciurus hudsonicus grahamensis) 5-Year Review: Summary and Evaluation" (PDF). U.S. Fish and Wildlife Service Arizona Ecological Services Field Office Phoenix, Arizona. January 2008. Retrieved 10 April 2010.
  7. 1 2 3 4 "The Mt. Graham Red Squirrel Research Program Project History". The University of Arizona. Retrieved 13 September 2012.
  8. "Endangered and Threatened Wildlife and Plants; Review of Vertebrate Wildlife for Listing as Endangered or Threatened Species" (PDF). Fish and Wildlife Service, Interior. December 30, 1982. Retrieved 10 April 2010.
  9. "50 CFR Part 17" (PDF). Fish and Wildlife Service, Interior. May 21, 1986. Retrieved April 10, 2010.
  10. Albeck-Ripka, Livia (October 25, 2017). "For an Endangered Animal, a Fire or Hurricane Can Mean the End". New York Times.
  11. "US officials to consider protections for endangered Arizona squirrel". KTAR News. September 5, 2019. Archived from the original on 2019-09-10. Retrieved September 8, 2019.