Biology:Djungarian hamster

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Djungarian hamster
PhodopusSungorus 1.jpg
Scientific classification edit
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Rodentia
Family: Cricetidae
Subfamily: Cricetinae
Genus: Phodopus
Species:
P. sungorus
Binomial name
Phodopus sungorus
(Pallas, 1773)

The Djungarian hamster (Phodopus sungorus), also known as the Dzungarian hamster, striped dwarf hamster, Siberian hamster, Siberian dwarf hamster or Russian winter white dwarf hamster, is one of three species of hamster in the genus Phodopus. It is ball-shaped and typically half the size of the Syrian hamster, so is called a dwarf hamster along with all Phodopus species. Features of the Djungarian hamster include a typically thick, dark grey dorsal stripe and furry feet. As winter approaches and the days shorten, the Djungarian hamster's dark fur is almost entirely replaced with white fur. In captivity, this does not always happen. In the wild, they originate from Dzungaria, the wheat fields of Kazakhstan, the meadows of Mongolia, Siberia, and the birch stands of Manchuria.

Djungarian hamsters are common as pets in Europe and North America, and exhibit greater variance in their coats than those found in the wild. They reproduce often—more so than Syrian hamsters, and as they have no fixed breeding season, can continue to produce large numbers of offspring all year round. Young pups act aggressively to one another, while breeding females may show similar aggression to males.

Physical description

Normal colouration

left|thumb|95px|Pearl colourationleft|thumb|95px|Sapphire colourationThe coat of the Djungarian hamster is less woolly than that of Campbell's dwarf hamster,[2] and apart from the normal colouring, they can be coloured sapphire, sapphire pearl, or normal pearl. The head length of the Djungarian hamster is 70–90 mm, the length of the tail is 5–15 mm, and the hind legs are 11–15 mm.[3][4] The body weight changes dramatically throughout the year. It is at its lowest during the winter.[5] In males, the body weight ranges from 19 to 45 grams (0.67 to 1.59 oz), and in females, 19 to 36 grams (0.67 to 1.27 oz).[4] In human care, they are slightly heavier. The average lifespan of the Djungarian hamster is one to three years in captivity, though they can live longer. In the wild, they are known to live as little as one year.[2]

In summer, the fur of the Djungarian hamster on the back changes from ash-grey to dark brown, or sometimes pale brown with a tint.[6] The face changes to grey or brown, while the mouth area, the whisker area, and the ears are slightly brighter.[7] The outer ears and the eyes have black edges. The rest of the head is dark brown or black. From the head to the tail runs a black-brown dorsal stripe.[8] The throat, belly, tail and limbs are white.[7] The ears are grey with a pinkish tint[6] with scattered black hairs. The hairs on the underside are completely white.[9][10] The bright coat the bottom extends to the shoulders, flanks, and hips in three arches upward. It is distinguished from the darker fur on the top of the existing black-brown hair, three curved line.[4]

Apart from the typical colouration, Djungarian hamsters can also be coloured pearl, sapphire, sapphire pearl, and marbled. Other colorations are available, but these are strongly suspected to appear only in hybrid crossings with Campbell's dwarf hamsters. Some of these colorations are mandarin, blue, argente, yellow blue fawn, camel, brown, cream, merle, and umbrous.[2]

In the winter, the fur is more dense.[11] They sometimes have a grey tint on their heads.[12] More than 10% of the hamsters kept in the first winter develop the summer coat. In the second winter, only a few change into the winter coat and winter colour is less pronounced. The moulting in the winter fur starts in October or November and is completed in December, while the summer coat begins in January or February and is completed in March or early April.[7] The ears are grey with a pinkish tint.[2] Moulting both run jobs on the head and the back of the spine to the sides, the legs and the underside.[13] The hairs grow longer in the summer, to about ten millimetres long.[6]

The pigmentation of hair is controlled by the hormone prolactin and colour genetics.[14] Day length can be less than 14 hours to initiate the change to winter coat, though it is possible they may be able to sense a directional change in photoperiod length, such as in one experiment that demonstrated a transition from 16 hours of light to 14 hours initiates a change to the winter coat.[15] The change to the winter coat can be triggered in the summer by the short day lengths. The change occurs back to the summer coat in the autumn, when the length of the days change again. At internal temperatures hamsters in captivity start later with the changes. The winter colour is less pronounced in them.[7] --> The eyes of the Djungarian hamster are black, unless it is albino in which case they are red.[6]

In the wild

Peter Simon Pallas named the Djungarian hamster in 1773 as Mouse sungorus.

In the wild, the Djungarian hamster's fur changes colour in the winter. This adaptation helps them to evade predators in the snow-covered steppes.[2] The Djungarian hamster digs tunnels one metre deep leading to ground burrows where they can sleep, raise their young and hide from predators.[6] The weasel is one of the Djungarian hamster's main predators.[4] Most of these burrows have six entrances. In the summer, the burrows are lined with moss. To keep the burrow warm in the winter, the Djungarian hamster closes all but one entrance and lines the burrows with animal fur or wool that it finds. The temperature inside the burrow is usually 16.7 °C (62.1 °F).[2] Djungarian hamsters sometimes live in the semideserts in Central Asia.[16] They also live in the dry steppes and wheat or alfalfa fields, as well as on small fields in the forests of the region around Minusinsk.[17] The fur on the Djungarian hamster's feet protect the feet from the cold ground in the cold climates in the wild.[2] The population density is highly varied.[16] In 1968, the first four examples of the Djungarian hamster were caught in Western Siberia and brought to the Max Planck Institute in Germany .[6]

Systematics

The Djungarian hamster is a species of Phodopus. Campbell's dwarf hamster is a separate species, Phodopus campbelli, though once considered a subspecies. Other subspecies are not distinguished. The Djungarian hamster was described by Peter Simon Pallas in 1773 as a mouse.[18] The species name sungorus derives from the Dsungaria.[19] In 1778, Pallas renamed the Djungarian hamster to Mouse songarus.[20] Ned Hollister ordered the Djungarian hamster in 1912 to the genus Phodopus.[21] A. I. Argiropulo, in 1933, changed the name to priority sungorus[22] and united the Djungarian hamster as a subspecies of Phodopus sungorus sungorus with Campbell's dwarf hamster.[23]

Pet ownership

Djungarian hamsters are often found on the pet market in Europe, Japan, and North America.[2] Care of the Djungarian hamster is similar to all other species of Phodopus.[24] Djungarian hamsters, along with most rodents, are prone to tumours. They can also receive injury in the cheek pouch by sharp objects damaging the fragile inner lining. Other health problems include bite wounds, broken teeth, constipation, dehydration, dental malocclusion, diarrhea, and ear problems.[25] The Djungarian hamster is easy to tame. In addition to natural colourings in the wild ("ruddy" or "agouti"), Djungarian hamsters in captivity occur in a variety of different colors. They are prone to diabetes so when in captivity you should always watch their sugar intake. Avoid foods such as corn, cherries, bananas and grapes, in large amounts because they are high in sugar. Djungarian hamsters should be fed dry food and fruits and vegetables. When being fed fruits and vegetables make sure that for every fruit that there is a vegetable to balance out the sugar intake.

Breeding

Djungarian hamsters reproduce at a faster rate than Syrian hamsters.[25][26] Phodopus species are able to become pregnant again on the same day that they have given birth. This can all happen within a 36-day period. This is done as a survival strategy to produce large numbers of offspring in a short period of time. This places tremendous demands on the mother.[25] Research suggests biparental care in Campbell's hamsters (P. campbelli) but not in Djungarian hamsters (P. sungorus).[27] Frequent fighting can occur between the pups and as soon as they are weaned from their mother, they are separated from her. Most Djungarian hamster dwarf hamsters grow to 3 to 4" long. Djungarian hamsters breed all year round as no specific breeding season exists.[6]

During the breeding time, the Djungarian hamster may become aggressive. After mating, the female may want to attack the male to protect her babies. The male usually hides in holes or caves to escape the vicious bite of the female.[28] The Djungarian hamster's estrous cycle lasts four days; every four days, the female may accept the male back to breed again. This usually occurs when the darkness of the evening sets in. If male and female Djungarian hamsters are not housed together from a young age, determining if the female is willing to breed with the male is difficult.[2]

Hybrids

Of the five species kept commonly as pets, only Campbell's dwarf hamster and Djungarian hamsters are able to interbreed and produce live hybrid offspring. Although hybrids make suitable pets, the breeding of hybrids and cloning can cause health and reproduction problems. In addition, the widespread breeding and distribution of hybrids could threaten the existence of both pure species and subspecies of the ecosystem, resulting in only mongrels. Hybridizing causes each litter to become smaller and the young begin to form congenital problems.[2]

References

  1. ↑ Template:IUCN2008 Database entry includes a brief justification of why this species is of least concern.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 The Dwarf Hamster: A Guide to Selection, Housing, Care, Nutrition, Behaviour, Health, Breeding, Species and Colours (About Pets) ISBN:978-1-85279-210-7
  3. ↑ Winogradow und Argiropulo 1941. Zitiert in: Ross 1998 (S. 1, „General Characters“)
  4. ↑ 4.0 4.1 4.2 4.3 Krylzow und Schubin 1964. Zitiert in: Ross 1998 (S. 1, „General Characters“).
  5. ↑ Bartness & Wade, 1985. Photoperiodic control of seasonal body weight cycles in hamsters (Abstract)
  6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 How to Care for Your Dwarf Hamster (Your first...series) ISBN:1-85279-150-0
  7. ↑ 7.0 7.1 7.2 7.3 Figala und Mitarbeiter 1973 (Abstract). Die Angaben beziehen sich auf unter natürlichen Bedingungen gehaltene Hamster.
  8. ↑ Ross, Patricia (1992). On activity and behavior of three taxa of dwarf hamsters of the genus' Phodopus Miller, 1910. Plant Journal of Mammalogy. pp. 65–76.  Dissertation Quoted in Ross 1998 (p. 1, Diagnosis, General Characters "
  9. ↑ Hamann, U. (1987). The Red Book of Varieties and Schemes. Lecture notes in mathematics 1358.  Quoted in Ross 1998 (p. 1, "Context and Content" of the genre, "Diagnosis "
  10. ↑ Logsdail, Chris (2005). Hamsterlopaedia. A Complete Guide to Hamster Care. Ringpress Books. p. 174. ISBN 1-86054-246-8. 
  11. ↑ Honey, Sandra (2005). Dwarf hamsters. Biology. Attitude. Breeding. 2nd. Nature-and animal-Verlag. pp. 9, 56–58. 
  12. ↑ Pallas 1773rd Quoted in Ross 1998 (p. 1, General Characters ").
  13. ↑ Zdenek, Veselovský (1964). Contribution to knowledge of Dzungars-Hamsters, Phodopus sungorus (Pallas, 1773). Journal of Mammalogy. pp. 305–311.  Quoted in Ross 1998 (p. 1-2, " form ")
  14. ↑ Duncan, Marilyn (1984). Hormonal regulation of the annual pelage color cycle in the Djungarian hamster, Phodopus sungorus. I. Role of the gonads and the pituitary. Anthology The Journal of Experimental Zoology. pp. 89–95. 
  15. ↑ Niklowitz P., Lerchi A., Nieschlag, E. 1994. Photoperiodic responses in Djungarian Hamsters (Phodopus sungorus): Importance of Light History for Pineal and Serum Melatonin Profiles. Biology of Reproduction. 51: 714-724.
  16. ↑ 16.0 16.1 Boris Stepanovich Yudin, Lijana Ivanova Galkina, Antonina Fedorovna Potapkina 1979 Quoted in Ross 1998 (p. 5, "Ecology ").
  17. ↑ M. N. Meier 1967 Peculiarities of the reproduction and development of‘‘Phodopus’’ sungorus Pallasof different geographic populations] Volume 46 Russian Cited In: Ross 1998 (p. 5, "Ecology"). The figures refer to the area of Minusinsk.
  18. ↑ Sungorus Pallas 1773 (p. 703) . Quoted in:. Ross 1998 (p. 1, synonymy of the species)
  19. ↑ Steinlechner 1998, DJUNGARIAN HAMSTER AND/OR SIBERIAN HAMSTER: WHO IS WHO?, European Pineal Society NEWS (p. 8).
  20. ↑ Peter Simon Pallas 1778 quadrupedum species novae e ordine glirium p. 269 Quoted in Ross 1998 (p. 1, synonymy of the species)
  21. ↑ Ned Hollister 1912 New mammals from the highlands of Siberia Quoted in:. Ross 1998 (p. 1, synonymy of the species)
  22. ↑ Argiropulo 1933rd Quoted in:. Ross 1998 (p. 1, synonymy of the species)
  23. ↑ Argiropulo 1933 (p. 136). Quoted in Ross 1998 (p. 6, "Remarks ").
  24. ↑ "Siberian Hamster". Siberian Hamster. http://siberianhamster.net/siberian-hamster.html. Retrieved 2011-08-08. 
  25. ↑ 25.0 25.1 25.2 Dwarf Hamsters: Everything about Purchase, Care, Nutrition, and Behavior (Barron's Complete Pet Owner's Manuals) ISBN:0-7641-4096-5
  26. ↑ Breeding hamsters - how to breed hamsters "Syrian". http://www.ask-the-vet.com/breeding-hamsters-breed-hamsters.htm Breeding hamsters - how to breed hamsters. Retrieved 8 August 2011. 
  27. ↑ Research by Dr. Katherine Wynne-Edwards at Queen's University, Ontario, Canada
  28. ↑ Sandra Honey: Dwarf hamsters. Biology. Attitude. Breeding. 2nd Edition. Nature and animal-Verlag, Münster 2005, ISBN:3-931587-96-7

External links

Wikidata ☰ Q214633 entry




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