Several taxonomic changes have occured that are relevant for T. umbrinus. The genus, Tamias as a whole was formerly known as Eutamias. A sub-species once classified as Eutamius quadrivittatus inyoensis is now placed in T. umbrinus as T. umbrinus inyoensis (Johnson, 1943). It has been suggested that the genus be split into three subgenera, Neotamias, Eutamias, and Tamias, and that both T. umbrinus and T. palmeri be classified as subspecies of Neotamias umbrinus as N. u. umbrinus and N. u. palmeri (Piaggio, 2001).
Uinta chipmunks have been a model for study of territoriality, parapatry, and interspecific competitive exclusion. It has been noted that factors affecting the range of the species include its adaptation to arboreal life and social behavior (see Brown, 1971) or its suceptability to a parasite (Bergstrom, 1992). In the former study, competition with the more aggresive Tamias dorsalis was found to be minimal within the arboreal home range of T. umbrinus, whereas in areas of sparse growth T. dorsalis had a much easier time chasing off Uinta chipmunks. In Bergstrom's study, T. umbrinus was described as the more aggressive species, but showed a higher sensitivity to infestations of larval cuterebrid bot fly common in the lower-elevation territories of two other species.
Communication and perception in this species have not been reported. However, it is likely that Uinta chipmunks are like other western chipmunks in these areas. Most chipmunks use a combination of vocalizations and visual cues, such as body posture and tail positioning, in their communication. There is likely to be tactile communication during mating and rearing of young. The role of olfactory cues has not been examined.
Communication Channels: visual ; tactile ; acoustic
Perception Channels: visual ; tactile ; acoustic ; chemical
Tamias umbrinus is a protected non-game species, but is not in danger of extinction and is fairly abundant where it occurs.
US Federal List: no special status
CITES: no special status
IUCN Red List of Threatened Species: least concern
Uinta chipmunks are not known to have negative effects on humans.
There is no direct economic impact of this species on humans. However, indirectly, these chipmunks may be beneficial. Because of their role in seed dispersal, they may help forests to regenerate.
Because chipmunks carry seeds from their source to caches, it is likely that these animals aid in the dispersal of various seeds. Any burrowing done aids in soil aeration. In addition, these animals provide a host for larval cuterebrid bot flies (Cuterebra fontinella).
Ecosystem Impact: disperses seeds; soil aeration
Commensal/Parasitic Species:
Tamias umbrinus is omnivorous and spends the summer months searching for food in trees, snags, shrubs, and on the ground. In the autumn months, extra food is gathered and stored in underground caches to be used during the winter. Uinta chipmunks feed primarily on fruit, conifer mast, and seeds of maple, juniper, and chokecherry. In addition, fungi obtained by digging are a substantial part of ithe diet. Other items occasionally consumed include pollen, buds, insect larvae, and even bird eggs.
Animal Foods: eggs; insects
Plant Foods: seeds, grains, and nuts; fruit; flowers
Other Foods: fungus
Foraging Behavior: stores or caches food
Primary Diet: omnivore
Uinta chipmunks, Tamias umbrinus, are discontinously distributed in eight western states, including Nevada, Utah, northern Arizona, eastern California, northwestern Colorado, western and southern Wyoming, eastern Idaho, and southern Montana. Specific mountain ranges where T. umbrinus is found are the Beartooth Mountains in Montana; Uinta and Wasatch Mountains in Utah and Wyoming; Salt River, Wind River, Teton, and Absaroka Mountain ranges in Wyoming; Big Hole Mountains in eastern Idaho; and the Inyo, White, and Sierra Nevada mountains in eastern California and western Nevada.
Biogeographic Regions: nearctic (Native )
Tamias umbrinus inhabits moderate to high elevation coniferous forests (2000 to 3400 m) typically composed of spruce-fir, Douglas-fir, lodgepole pine, bristlecone, whitebark, ponderosa, limber, foxtail, or drier pinyon pine (Harris, 2004; Streubel, 2000; Montana Fish, Wildlife and Parks, 2005). These chipmunks favor locations near logs and brush in exposed timberline slopes and ridges. The species is primarily arboreal, dwelling in tree cavities where they may sleep or even nest. In addition, individuals of the species may burrow underneath shrubs and rock.
Range elevation: 2000 to 3400 m.
Habitat Regions: temperate ; terrestrial
Terrestrial Biomes: forest ; mountains
The lifespan of Tamias umbrinus has not been recorded. However, most chipmunks do not live very long. A wild Tamias rufucaudus is reported to have lived for 8 years, and a captive Tamias townsendii lived over 10 years. Uinta chipmunks are likely to have maximum lifespans no greater than this.
Tamias umbrinus is a medium-sized species of chipmunk with an average total body length of about 225 mm, and an average mass of 59 g. As in other species of Tamias, males are typically somewhat smaller than females. Five subspecies of T. umbrinus have been documented.
It can be difficult to distinguish Uinta chipmunks from other co-occurring species of chipmunks strictly by sight. However, one diagnostic pelage feature is that the light dorsal stripes are white and surround noticeably-broader brown, rather than black, dorsal stripes as in other species of Tamias. In addition, the medial dorsal stripe, unlike several other species of chipmunk, is not black but instead brownish-black. The outermost dark dorsal stripe is very faint or absent. Tamias umbrinus also possesses a dark-brown tail that is held horizontal while running. The ventral pelage is whitish and the flanks are generally brown or cinnamon in color. The species displays smoky gray-brownish pelage on the head and face regions, with blackish ocular stripes, brown submalar stripes, grayish white postauricular patches, and blackish and grayish white coloration on the anterior and posterior part of the ears, respectively. Winter and summer pelage do not differ significantly.
Like other species of chipmunks, T. umbrinus possesses large, fur-lined, cheek pouches for food storage. This enables individuals to gather and store food as they forage and then transport it back to caches for consumption during winter months. This derived characteristic distinguishes chipmunks from the other members of Scuridae. When danger approaches, chipmunks can run at full speed while still retaining the gathered food in their cheek pouches.
Uinta chipmunks hibernate, and so are heterothermic. An individual's body temperature lowers during hiberation. However, because body temperature remains constant both in hibernation and when individuals are active, they are also homoiothermic.
Range mass: 51 to 74 g.
Average mass: 59.3 g.
Range length: 216 to 240 mm.
Average length: 225.9 mm.
Other Physical Features: endothermic ; heterothermic ; homoiothermic; bilateral symmetry
Sexual Dimorphism: female larger
Predators of T. umbrinus include carnivorous mammals such as weasels, coyotes, foxes, bobcats, and birds such as raptors.
Known Predators:
Anti-predator Adaptations: cryptic
Reproductive habits and biology have not been extensively studied in this species, but are likely to be similar to other species of chipmunks in the western region. Once hibernation terminates, nests are built in tree cavities, underground burrows, and even abandoned bird nests. Males may mate with multiple females, and females may also have multiple mates.
Mating System: polygynandrous (promiscuous)
These animals produce one litter per year. Mating typically occurs after animals come out of hibernation in the spring. Litters of 4 to 5 young are born after a gestation of about one month. The mother may nurse the young for one to two months. Young chimpmunks typically disperse before the winter of the year in which they are born. They are usually reproductively mature by the following spring.
Breeding interval: Uinta chipmunks have a single litter per year.
Breeding season: Mating occurs in spring.
Range number of offspring: 4 to 5.
Average gestation period: 30 days.
Average weaning age: 2 months.
Average age at sexual or reproductive maturity (female): 10 months.
Average age at sexual or reproductive maturity (male): 10 months.
Key Reproductive Features: iteroparous ; seasonal breeding ; gonochoric/gonochoristic/dioecious (sexes separate); sexual ; fertilization ; viviparous
Data on the reproduction of these animals is scant. However, they are likely to resemble other members of the genus Tamias in regard to parental care. In most chipmunks for which data exist, female parental care seems to be the rule. Males do not participate in the rearing of the young. The female nurses her young for 1 to 2 months. Young typically disperse before winter.
Parental Investment: altricial ; pre-fertilization (Provisioning, Protecting: Female); pre-hatching/birth (Provisioning: Female, Protecting: Female); pre-weaning/fledging (Provisioning: Female, Protecting: Female); pre-independence (Protecting: Female)
The Uinta chipmunk[1] or hidden forest chipmunk[2] (Neotamias umbrinus), is a species of chipmunk in the family Sciuridae. It is endemic to the United States. Formerly known as Tamias umbrinus,[1] phylogenetic studies have shown it to be sufficiently distinct from the eastern chipmunk as to be placed in a separate genus, Neotamias.[3] The same studies have also suggested that Palmer's chipmunk may actually be a subspecies of Uinta chipmunk, although the two are still generally regarded as separate species.[4]
The Uinta chipmunk is a medium-sized chipmunk, with adults ranging from 20 to 24 cm (7.9 to 9.4 in) in length, including the tail at 7 to 11 cm (2.8 to 4.3 in), and weighing an average of 67 g (2.4 oz). The predominant color of the summer coat varies from yellowish brown-grey to dark brown, often with a reddish tinge. Three wide, distinct dark blackish-brown stripes run down the back, separated and surrounded by four paler stripes of pale grey to white fur. Also, three dark and three pale stripes are on each side of the face. In the winter, the coat becomes duller and more greyish, and the stripes become less distinct. The ears are black, and the underparts a very pale grey. The tail has orange and black fur, with a paler fringe of hair on the underside.[5]
The Uinta chipmunk lives in montane and subalpine forests of the western United States, between 1,400 and 3,650 m (4,590 and 11,980 ft) elevation. It is most common at the margins of pine and fir forests, or in clearings, often near rocky terrain or steep slopes.[5][6] Uinta chipmunks do not have a continuous, unbroken range, but are instead found in a number of disjunct localities,[2] perhaps reflecting changing patterns of forest cover during the Pleistocene. Seven subspecies are currently recognized:
Uinta chipmunks are herbivorous. Their primary diet consists of the seeds of coniferous trees such as Douglas fir, ponderosa pine, juniper, and spruce, and on the fruit of local shrubs such as wild roses, raspberries, and chokecherries. They also eat some grass and fungi, and may supplement their diet with small quantities of insects or carrion.[5]
The chipmunks are solitary, diurnal, animals, and are aggressive to other members of their own species, each individual defending a territory of 2 to 5 ha (4.9 to 12.4 acres).[7] They establish dens in burrows under rocks, shrubs, or other shelter, or else in natural rock crevices or hollow logs. They spend much of the winter in their dens, but are otherwise highly arboreal, climbing trees to search for food and escape from predators.[5]
The animals have been reported to make a number of different vocalizations, with most common being bursts of sharp "chip" sounds that can continue for up to 15 minutes, and are made from exposed locations, such as rock outcrops or high branches. Other vocalizations include lower-pitched "chuck" sounds, often interspersed with "chips" while fleeing from predators, trills, and squeals.[8]
The breeding season occurs in the spring, roughly from late April to early June, with the exact time depending on the local climate and latitude. The mother gives birth to a single litter of three to five young after a gestation period around 30 days. The young are weaned around 25 days of age, and begin to leave the burrow shortly thereafter.[5] Only 27.5% of Uinta chipmunks survive through the winter, and the maximum life expectancy is believed to be two years.[8]
The Uinta chipmunk or hidden forest chipmunk (Neotamias umbrinus), is a species of chipmunk in the family Sciuridae. It is endemic to the United States. Formerly known as Tamias umbrinus, phylogenetic studies have shown it to be sufficiently distinct from the eastern chipmunk as to be placed in a separate genus, Neotamias. The same studies have also suggested that Palmer's chipmunk may actually be a subspecies of Uinta chipmunk, although the two are still generally regarded as separate species.
