Panamint kangaroo rat

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Panamint kangaroo rat
Panamint kangaroo rat.jpg
A taxidermied Panamint kangaroo rat at a visitor center
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Rodentia
Family: Heteromyidae
Genus: Dipodomys
Species:
D. panamintinus
Binomial name
Dipodomys panamintinus
(Merriam, 1894)

The Panamint kangaroo rat (Dipodomys panamintinus) is a species of rodent in the family Heteromyidae. [2] It is endemic to the Mojave Desert in eastern California and western Nevada, in the United States. [1]

Description

The Panamint kangaroo rat is considered medium-sized for its genus. It is pale clay-colored with blackish patches around the face. The tail is extremely long, on average 140% of its body length and contains a white stripe with a heavy tuft of hair at the end. [3] The species is named after an area of its range in the Panamint Valley and Panamint Range Mountains just west of Death Valley. Their common name derives from their bipedal form. They morphologically adapted to use bipedal hopping as their primary means of locomotion. [3]

The Panamint kangaroo rat can be distinguished from other species of the genus because the hind feet have five toes which varies in comparison to other members which have four toes on their hind feet. Sexual dimorphism is present where males tend to be larger than females in body size. [3]

A notable characteristic of the Panamint kangaroo rat is the fur lined cheek pouches that it uses to obtain large quantities of food. These pouches keep the food separate from the mouth which aids in preventing moisture loss. [3]

Ecology

Range and habitat

The Panamint kangaroo rat has a rather restricted distribution in comparison to some species of the genus. It is centered in Great Basin bush desert in western Nevada and east of the Sierra Nevada mountains in California with a long extension southward into the western Mojave Desert. They tend to live at higher elevations between 1,200 and 1,950 meters (3,940 and 6,400 ft). [3] [4]

Panamint kangaroo rats occupy holes in small mounds of sand that have accumulated around clumps of brush. In the Panamint Mountains, one animal may occupy a burrow that has 12 or more tunnels, the mouths of which are connected on the surface by well-defined runways. Home range size varies throughout the year, peaking in February and July. [3]

Diet

Dipodomys panamintinus is a granivore that lives on metabolic water. Their diet tends to vary with the seasons, but tends to primarily consist of seeds that are high in carbohydrates. It gathers large bunches of seeds and packs them into fur-lined cheek pouches. Some examples of seeds and other food sources which they obtain are pinion pine, juniper berries, green shoots of grass, insects, and mesquite. [3] [5]

They tend to partake in both scatter hoarding (single or small clusters of seeds buried in the ground surface) and larder hoarding (deposition of seeds in burrows and chambers). This hoarding style affects seed dispersal throughout the environment in which they live. [5] [6] They rely heavily on olfactory senses to be able to locate these seed deposits for utilization during times of food scarcity. Based on the physiological aspect of their sense of smell, Panamint kangaroo rats seem to have a better time locating these hoards during dry weather. [7]

Behavior

The Panamint kangaroo rat is nocturnal and does not hibernate. It tends to be active throughout the year except when limited by snow cover. The species is solitary and separate except during estrus. [3] [4] [8]

Locomotion

The bipedal form of locomotion that the Panamint kangaroo rat utilizes is very specialized. They will move by various means depending on the environmental situation they are in. For example, when undisturbed, a slowly moving animal travels by quadrupedal hopping, bipedal hopping or, bipedal walking and when frightened, the hopping changes into erratic bipedal leaps in order to avoid predators. Panamint kangaroo rats are excellent swimmers, their large hind feet give them considerable agility in the water. The Panamint kangaroo rat's hop is about the same length of its body. [3] The availability of water and nutrition can have an effect on the activity of the animal. [5]

Mating and reproduction

Responses between males and females change cyclically as a female passes through estrus. Continuous proximity of the male may cause the female to stop cycling so, successful breeding demands that both sexes dwell separately, coming together for mating with only a brief paring interval. [8] Males home ranges will become broader during spring for mating. The height of breeding season is between February and March. [3] Litter size ranges between 3-4 young. [3]

Physiology

Because of the dry desert environment that the Panamint kangaroo rat inhabits, it has developed a specialized way to metabolize water from their food that they obtain. These kangaroo rats are able to excrete urine that is extremely concentrated as a means to retain water. When deprived of water, it only produces a small drop of urine every 1–2 hours. [3] Surprisingly these kangaroo rats possess very limited means of temperature regulation, despite living in an environment characterized by wide extremes of temperature. Above 35 °C the Panamint kangaroo rat utilizes their burrows to help maintain homeothermy. [3]

Related Research Articles

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<span class="mw-page-title-main">Heteromyidae</span> Family of rodents

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<span class="mw-page-title-main">Dipodomyinae</span> Subfamily of rodents

Dipodomyinae is a subfamily of heteromyid rodents, the kangaroo rats and mice. Dipodomyines, as implied by both their common and scientific names, are bipedal; they also jump exceptionally well. Kangaroo rats and mice are native to desert and semidesert ecosystems of western North America from southern Canada to central Mexico. They are generally herbivorous foragers, and dig and live in burrows.

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<span class="mw-page-title-main">Desert kangaroo rat</span> Species of rodent

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<span class="mw-page-title-main">Merriam's kangaroo rat</span> Species of rodent

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<span class="mw-page-title-main">Banner-tailed kangaroo rat</span> Species of rodent

The banner-tailed kangaroo rat is a species of rodent in the family Heteromyidae. It is found in arid environments in the southwestern United States and Mexico where it lives in a burrow by day and forages for seeds and plant matter by night.

<span class="mw-page-title-main">Stephens's kangaroo rat</span> Species of rodent

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<span class="mw-page-title-main">Silky pocket mouse</span> Species of rodent

The silky pocket mouse is a species of rodent in the family Heteromyidae. It is found in northern and central Mexico and the southwest region of the United States. It is a species of least concern, according to the IUCN, with no known major threats. The silky pocket mouse eats seeds, succulent parts of plants and nuts, and carries food in its cheek pouches. It lives in low valley bottoms with soft soils, among weeds and shrubs, where it burrows in the sand to bury seed caches. The species is more tolerant of harsh habitat conditions than other pocket mice.

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References

  1. 1 2 Cassola, F. (2017) [errata version of 2016 assessment]. "Dipodomys panamintinus". IUCN Red List of Threatened Species . 2016: e.T42604A115193637. doi: 10.2305/IUCN.UK.2016-3.RLTS.T42604A22227430.en . Retrieved 9 March 2022.
  2. Patton, J.L. (2005). "Family Heteromyidae". In Wilson, D.E.; Reeder, D.M (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Johns Hopkins University Press. p. 848. ISBN   978-0-8018-8221-0. OCLC   62265494.
  3. 1 2 3 4 5 6 7 8 9 10 11 12 13 Intress, Clare; Best, Troy. "Dipodomys panamintinus". Mammalian Species Account. The American Society of Mammalogists. Archived from the original on 24 November 2012. Retrieved 7 April 2015.
  4. 1 2 Price, Mary; Waser, Nickolas; McDonald, Shauna (2000). "Elevational Distributions of Kangaroo Rats (Genus Dipodomys): Long-Term Trends at a Mojave Desert Site". The American Midland Naturalist. 144 (2): 352–361. doi:10.1674/0003-0031(2000)144[0352:edokrg]2.0.co;2. S2CID   85806413 . Retrieved 7 April 2015.
  5. 1 2 3 Jenkins, Stephen; Ascanio, Rhoda (1993). "A Potential Nutritional Basis for Resource Partitioning by Desert Rodents". American Midland Naturalist. 130 (1): 164–172. doi:10.2307/2426284. JSTOR   2426284.
  6. Hollander, Jennifer; Vander Wall, Stephen (2004). "Effectiveness of Six species of Rodents as Dispersers of Singleleaf Pinion Pine". Oecologia. 138 (1): 57–65. doi:10.1007/s00442-003-1393-2. JSTOR   40005381. PMID   14534782. S2CID   8934280.
  7. Vander Wall, Stephen; Beck, Maurie; Briggs, Jennifer (2003). "Interspecific variation in the olfatory abilities of granivorous rodents". Journal of Mammalogy. 84 (2): 487–496. doi: 10.1644/1545-1542(2003)084<0487:ivitoa>2.0.co;2 .
  8. 1 2 Stevens, Richard; Tello, J. Sepastian (2012). "Do desert rodents form metacommunities?". Journal of Mammalogy. 93 (4): 1029–1041. doi: 10.1644/11-mamm-a-292.2 .