Speckled ground squirrel

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Speckled ground squirrel
Spermophilus suslicus-small.JPG
Conservation status
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Rodentia
Family: Sciuridae
Genus: Spermophilus
Species: S. suslicus
Binomial name
Spermophilus suslicus
(Güldenstädt, 1770)
Subspecies

Spermophilus s. boristhenicus
S. s. guttatus
S. s. suslicus

The speckled ground squirrel or spotted souslik (Spermophilus suslicus) is a species of rodent in the family Sciuridae.[2] Spermophilus suslicus consists of three subspecies: S. s. boristhenicus, S. s. guttatus, and S. s. suslicus.[3] It is threatened by habitat loss.

Description[edit]

The Speckled ground squirrel has dark-brown fur with white spots on its back and a short, thin tail. It grows to a length of 25 cm and a weight of 280 g. Its dental formula is 1/1, 0/0, 2/1, 3/3. It is smaller and less social than other ground squirrels of the genus Spermophilus.[4]

Distribution[edit]

It is found in Poland (Lublin Voivodeship), Romania, Russia, Belarus and Ukraine. Its natural habitat is temperate grassland and it is also found on cultivated ground. It is threatened by the loss and fragmentation of its habitat. Causes of habitat loss include the expansion of agriculture and forestry, the reduction of pasturing, the development and growth of cities, and industrial development. Also, in some areas it is hunted as an agricultural pest.[1][5]

The speckled ground squirrel's range in Poland and southern Russia has contracted markedly, with only 10% of its area in the mid-twentieth century currently remaining. At the current rate of contraction of its range, the speckled ground squirrel will be extinct from Poland within the next couple decades.[1]

Behavior[edit]

The Speckled ground squirrel is a diurnal species which hibernates from October to April. It is active in the morning once the sun warms the area slightly, retreats to its underground den during the heat of the day, then reemerges late in the day for another feeding bout. It feeds mostly on grasses and cereals, although small vertebrates and arthropods are also eaten.[6]

Compared with other Spermophilus species, it lives in a relatively closed habitat with high grasses that block visibility during its active seasons.[4] Individuals live in separate burrows within a larger colony. These colonies can be up to over 160 individuals per ha. It mates between April and May. Gestation ranges from 23 to 26 days. Four to eight cubs are born per litter.[7] Sporadic hybridization occurs where S. suslicus occurs sympatrically with S. pygmaeus and S. citellus.[3]

Predators[edit]

Though there have been no quantitative studies on all the predators of S. suslicus, the weasel Mustela nivalis has been known to enter burrows and cause significant juvenile mortality, though it does not attack adults.[8] However, conspecific predation may be more of a threat to the juvenile speckled ground squirrel than interspecific predators. Though infanticide in the wild has not yet been reported, the speckled ground squirrel has been infanticidal in captivity. The killer can be male, female, or both, and either eats the child or attacks and leaves it to die.[8]

Alarm Calls[edit]

The spotted ground squirrel uses alarm calls for a variety of purposes. Primarily, the alarm call is used to warn conspecific squirrels of predators and to alert predators that they've been detected [4] Individual-specific alarm calls have been seen in Spermophilus suslicus which also contain age-related features but they lack the ability to distinguish between familiar and unfamiliar individuals nor can they distinguish sex.

References[edit]

  1. ^ a b c Zagorodnyuk, I., Glowacinski, Z. & Gondek, A. (2008). "Spermophilus suslicus". IUCN Red List of Threatened Species. Version 2013.1. International Union for Conservation of Nature. Retrieved 2013-09-30. 
  2. ^ Thorington, R. W., Jr.; Hoffman, R. S. (2005). "Family Sciuridae". In Wilson, D. E.; Reeder, D. M. Mammal Species of the World (3rd ed.). Johns Hopkins University Press. p. 811. ISBN 978-0-8018-8221-0. OCLC 62265494. 
  3. ^ a b Helgen, Kristopher M.; Cole, F. Russel; Helgen, Lauren E.; Wilson, Don E. (2009). "Generic revision in the holarctic ground squirrel genus" (PDF). Journal of Mammalogy 90 (2): 270–305. doi:10.1644/07-MAMM-A-309.1. 
  4. ^ a b c Matrosova, Vera A., Daniel T. Blumstein, Ilya A. Volodin, Elena V. Volodina. "The potential to encode sex, age, and individual identity in the alarm calls of three species of Marmotinae." Naturwissenschaften (2011). 98:181-192. doi: [1]
  5. ^ Shilova, S. A.; Neronov, V. V.; Shekarova, O. N.; Savinetskaya, L. E. (2010). "Generic revision in the holarctic ground squirrel genus". Biology Bulletin 37 (5): 532–536. doi:10.1134/S1062359010050134. 
  6. ^ Edelman, Andrew, ed. (2011). "Spermophilus suslicus". Encyclopedia of Life. 
  7. ^ MacDonald, David; Priscilla Barret (1993). Mammals of Britain & Europe 1. London: HarperCollins. p. 230. ISBN 0-00-219779-0. 
  8. ^ a b Matrosova, Vera A.; Volodin, Ilya A.; Volodina, Elena V.; Babitsky, Andrey F. (2007). "Pups crying bass: vocal adaptation for avoidance of age-dependent predation risk in ground squirrels?" (PDF). Behav Ecol Sociobiol 62: 181–191. doi:10.1007/s00265-007-0452. 

External links[edit]

Media related to Spermophilus suslicus at Wikimedia Commons