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Arctic ground squirrel

arctic ground squirrel, arctic ground squirrel pictures
10 ssp, see text

Synonyms

Urocitellus parryii

The Arctic ground squirrel Spermophilus parryii or Urocitellus parryii is a species of ground squirrel native to the Arctic People in Alaska, particularly around the Aleutians, refer to them as "parka" pronounced "par'kee" squirrels, most likely because their pelt is good for the ruff on parkas and for clothing[2]

Contents

  • 1 Taxonomy
  • 2 Description
  • 3 Distribution and habitat
  • 4 Behaviour
    • 41 Diet
    • 42 Reproduction
  • 5 Conservation
  • 6 References
  • 7 Further reading
  • 8 External links

Taxonomy

Subspecies listed alphabetically[3]

  • S p ablusus Osgood, 1903
  • S p kennicottii Ross, 1861 – Barrow ground squirrel northern Alaska, northern Yukon, and northern Northwest Territories
  • S p kodiacensis Ross, 1861
  • S p leucostictus Brandt, 1844
  • S p lyratus Hall and Gilmore, 1932
  • S p nebulicola Osgood, 1903
  • S p osgoodi Merriam, 1900
  • S p parryii Richardson, 1825
  • S p plesius Osgood, 1900
  • S p stejnegeri J A Allen, 1903

Description

The Arctic ground squirrel has a beige and tan coat with a white-spotted back This squirrel has a short face, small ears, a dark tail and white markings around its eyes Arctic ground squirrels undergo a coat change from summer to winter Summer coats include red/yellow colorations along the cheeks and sides of the animal In fall, these red patches are replaced with silvery fur The average length of an Arctic ground squirrel is approximately 39 cm 15 in Since Arctic ground squirrels undergo drastic seasonal changes in body mass, it is difficult[4] to give an average mass, but for adult females it is close to 750 g 26 oz, however, males generally are around 100 g 35 oz heavier than females[5]

Distribution and habitat

The Arctic ground squirrel can be found in regions of Northern Canada ranging from the Arctic Circle to northern British Columbia, and down to the southern border of the Northwest Territories, as well as Alaska and Siberia[1]

The Arctic ground squirrel is native to the North American Arctic tundra, where its main habitats are on mountain slopes, river flats, banks, lakeshores and tundra ridges of the arctic tundra Ground squirrels live in sandy soil due to easy digging and good drainage[6] Arctic ground squirrels make shallow burrows in areas where the permafrost does not prevent them from digging[7] The Arctic ground squirrel inhabits dry Arctic tundra and open meadows in the most southern habitats of this species[5]

On tundra, Kugluktuk, Nunavut

Behaviour

20,000-year-old Arctic ground squirrel mummy

The diurnal Arctic ground squirrel lives on the tundra and is prey to the Arctic fox, the red fox, wolverine, lynx, the grizzly bear, and eagles It is one of the few Arctic animals, along with their close relatives the marmots[8] and the un-related little brown bat that hibernate[9] In the summer it forages for tundra plants, seeds, and fruit to increase body fat for its winter hibernation By late summer the male Arctic ground squirrel begins to store food in its burrow so that in the spring[10] it will have edible food until the new vegetation has grown The burrows are lined with lichens, leaves, and muskox hair

During hibernation, its brain temperature drops to just above freezing, its core body temperature reaches temperatures down to -29 °C[11] and its heart rate drops to ~1BPM Peripheral, colonic, and blood temperatures become subzero

The Arctic ground squirrel hibernates over winter from early August to late April in adult females and from late September to early April for adult males,[12] at which time it can reduce its body temperatures from 37 °C 99 °F to as little as −3 °C 27 °F[13] In the warmer months, the squirrel is active during the day time

During the mating season, males engage in male-male aggressive encounters for the mating rights[14]

Communication between squirrels is done through both vocal and physical means When they meet, nose to nose contact is made or other body parts are pressed together The "tsik-tsik" calls are made in response to threats and vary as between different predators Deep guttural sounds are used to indicate land-based predators while short "band whistle" chatter indicates danger from the air[5]

Diet

This squirrel feeds on grasses, sedges, mushrooms, bog rushes, bilberries, willows, roots, stalks, leaves, leaf buds, flowers, catkins, and seeds They will also eat insects, and occasionally they will even feed on carrion such as mice, snowshoe hares and caribou[15] as well as juvenile Arctic ground squirrels[16] Sometimes these squirrels carry food back to their den in their cheeks[5]

Reproduction

Arctic ground squirrels live individually in burrow systems Mating occurs between mid-April and mid-May depending on latitude after winter hibernation Mating includes male-male competition for access to females, and litters are typically sired by multiple males Gestation is approximately 25 days, and results in a litter of 5 to 10, 10 g 035 oz hairless pups After 6 weeks the pups are weaned and this is followed by rapid growth to prepare for the upcoming winter[5]

Conservation

Although Environment Yukon has not estimated their population size, their conservation status is currently said to be "secure" Environment Yukon 2013[10] The Arctic ground squirrel is classified as least concern LC on the IUCN Red List Arkive 2013[17]

References

  1. ^ a b Linzey, A V 2008 "Spermophilus parryii" IUCN Red List of Threatened Species Version 2008 International Union for Conservation of Nature Retrieved 8 January 2009 
  2. ^ Antarctica and the Arctic Circle: A Geographic Encyclopedia of the Earth's Polar Regions
  3. ^ Spermophilus parryii, MSW3
  4. ^ Buck, CL; Barnes, BM 1999 "Annual cycle of body composition and hibernation in free-living arctic ground squirrels" Journal of Mammalogy 80 2: 430–442 doi:102307/1383291 
  5. ^ a b c d e Animal Diversity Web
  6. ^ Nadler C, Hopkins RS 1976 Patterns of evolution and migration in the arctic ground squirrel, Spermophilus parryii Richardson Chicago ZL USA: Department of Medicine, Northwestern University Medical School, and the University of Kansas, Lawrence KS USA: Museum of Natural History and Department of Systematics and Ecology; Available from: http://wwwnrcresearchpresscom/doi/pdf/101139/z77-097
  7. ^ "BBC Nature - Arctic ground squirrel videos, news and facts" BBC Earth Retrieved 6 November 2013 
  8. ^ Alaska Marmot Archived June 6, 2010, at the Wayback Machine
  9. ^ The Long Sleep: Which Animals Hibernate
  10. ^ a b "Arctic Ground Squirrel" Environment Yukon 3 March 2015 Retrieved 17 May 2015 
  11. ^ Liu Y, Hu W, Wang H, Lu M, Shao C, Menzel C, Yan Z, Ying L, Zhao S, Khaitovich P, Liu M, Chen W, Barnes BM, and Yan J: Genomic analysis of miRNAs in an extreme mammalian hibernator, the Arctic Ground Squirrel Physiological Genomics Archived April 2, 2015, at the Wayback Machine 42A:39-51 2010
  12. ^ Buck, CL; Breton, A; Kohl, F; Toien, O; Barnes, BM 2008 "Overwinter body temperature patterns in free-living Arctic Ground Squirrels Spermophilus parryii" Hypometabolism in Animals: Hibernation, Torpor and Cryobiology: 317–326 
  13. ^ Barnes, Brian M 1989-06-30 "Freeze Avoidance in a Mammal: Body Temperatures Below 0°C in an Arctic Hibernator" PDF Science American Association for the Advancement of Science 244: 1593–1595 doi:101126/science2740905 PMID 2740905 Archived from the original PDF on 2008-12-16 Retrieved 2009-08-12 
  14. ^ Buck, CL; Barnes, BM 2003 "Androgen in free-living arctic ground squirrels: seasonal changes and influence of staged male-male aggressive encounters" Hormones and Behavior 43: 318–326 doi:101016/s0018-506x0200050-8 
  15. ^ Torsten Bernhardt "Canadian Biodiversity: Species: Mammals: Arctic Ground Squirrel" Canadian Biodiversity Redpath Museum; McGill University Retrieved 6 November 2013 
  16. ^ McLean, Ian G 1983 "Paternal behaviour and killing of young in Arctic ground squirrels" Animal Behaviour 31 1: 32–44 doi:101016/S0003-34728380171-7 
  17. ^ Arkive, 2013 Arctic Ground Squirrel Available from: http://wwwarkiveorg/arctic-ground-squirrel/spermophilus-parryii/image-G78548html

Further reading

  • Hall, E Raymond 1981 The Mammals of North America 2 volumes Ronald Press
  • Helgen, K M; Cole, F R; Helgen, L E; Wilson, D E 2009 "Generic revision in the Holarctic ground squirrel genus Spermophilus" Journal of Mammalogy 90: 270–305 doi:101644/07-mamm-a-3091 
  • Thorington, R W Jr and R S Hoffman 2005 Family Sciuridae pp 754–818 in Mammal Species of the World a Taxonomic and Geographic Reference DE Wilson and DM Reeder eds Johns Hopkins University Press, Baltimore

External links

  • Media related to Arctic ground squirrel at Wikimedia Commons
  • Data related to Arctic ground squirrel at Wikispecies
  • Alaska portal
  • Arctic portal
  • Mammals portal
  • Yukon portal

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Arctic ground squirrel


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    29.10.2014


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