Sika deer

Sika deer
Male (stag)
Female (hind)
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Artiodactyla
Family: Cervidae
Subfamily: Cervinae
Genus: Cervus
Species: C. nippon
Binomial name
Cervus nippon
Temminck, 1838
Subspecies

See text

The sika deer (Cervus nippon) also known as the spotted deer or the Japanese deer, is a species of deer native to much of East Asia, and introduced to various other parts of the world. Previously found from northern Vietnam in the south to the Russian Far East in the north,[1] it is now uncommon in these areas, excluding Japan, where the species is overabundant.[2]

Etymology

Its name comes from shika (鹿), the Japanese word for "deer". In Japan the species is known as the nihonjika (ニホンジカ（日本鹿）, lit. "Japan deer").

Taxonomy

The sika deer is a member of the genus Cervus, a group of deer also known as the "true deer". Formerly, sika were grouped together in this genus with nine other species. Now, only the sika and red deer remain, the latter being divided into three separate species: European red deer, central Asian red deer and American elk (though this remains controversial).[3]

Recent DNA evidence indicates these deer are not as closely related as previously thought, resulting in the creation of new species and genera. The genera Rucervus, Rusa, and Przewalskium are where most of the former Cervus species now belong. The ancestor of all Cervus species probably originated in central Asia and resembled sika deer.[4] All Cervus species can crossbreed and produce hybrids in areas where they coexist (for example, introduced sika hybridize with native red deer in the Scottish Highlands, where this is a serious threat to the gene pool of the red deer population).

Subspecies

Serious genetic pollution has occurred in many populations, especially in China. Therefore, the status of many subspecies remains unclear.[1] The status of C. n. hortulorum is particularly uncertain and might in fact be of mixed origin, hence it is not listed here.

Description

A Sika deer in Shiretoko Peninsula, Hokkaido, Japan.

The sika deer is one of the few deer species that does not lose its spots upon reaching maturity. Spot patterns vary with region. The mainland subspecies have larger and more obvious spots, in contrast to the Taiwanese and Japanese subspecies, whose spots are nearly invisible. Many introduced populations are from Japan, so they also lack significant spots.

The color of the pelage ranges from mahogany to black, and white individuals are also known. During winter, the coat becomes darker and shaggier and the spots less prominent, and a mane forms on the back of the males' necks.[6] They are medium-sized herbivores, though they show notable size variation across their several subspecies and considerable sexual dimorphism, with males invariably much larger than females. They can vary from 50 to 110 cm (20 to 43 in) tall at the shoulder and from 95 to 180 cm (37 to 71 in) in head-and-body length. The tail measures about 7.5–13 cm (3.0–5.1 in) long.

The largest subspecies is the Manchurian sika deer (C. n. mantchuricus), in which males commonly weigh about 68–109 kg (150–240 lb) and females weigh 45–50 kg (99–110 lb), with large stags scaling up to 160 kg (350 lb). On the other end of the size spectrum, in the Japanese sika deer (C. n. nippon), males weigh 40–70 kg (88–154 lb) and females weigh 30–40 kg (66–88 lb).[7][8] All sikas are compact and dainty-legged, with short, trim, wedge-shaped heads and a boisterous disposition. When alarmed, they will often display a distinctive flared rump, much like the American elk.

Sika stags have stout, upright antlers with an extra buttress up from the brow tine and a very thick wall. A forward-facing intermediate tine breaks the line to the top, which is usually forked. Occasionally, sika antlers develop some palmation (flat areas). Females carry a pair of distinctive black bumps on the forehead. Antlers can range from 28 to 45 centimetres (11 to 18 in) to more than 80 centimetres (30 in), depending on the subspecies. Stags also have distinctive manes during the rut.

Behavior

A Manchurian sika deer.

The sika deer can be active throughout the day, though in areas with heavy human disturbance, they tend to be nocturnal. Seasonal migration is known to occur in mountainous areas, such as Japan, with winter ranges being up to 700 metres (2,300 ft) lower in elevation than summer ranges.[6]

Lifestyles vary between individuals, with some occurring alone while others are found in single-sex groups. Large herds will gather in autumn and winter. The sika deer is a highly vocal species, with over 10 individual sounds, ranging from soft whistles to loud screams.

Sika males are territorial and keep harems of females during the rut, which peaks from early September through October, but may last well into the winter months. Territory size varies with habitat type and size of the buck; strong, prime bucks may hold up to 2 hectares (5 acres). Territories are marked with a series of shallow pits or "scrapes", into which the males urinate and from which emanates a strong, musky odor. Fights between rival males are sometimes fierce and long, and may even be fatal.

A fawn of sika deer at the Wildpark Alte Fasanerie in Klein-Auheim

The gestation period lasts for 7 months. Hinds give birth to a single fawn, weighing 4.5 to 7 kilograms (9.9 to 15.4 lb), which is nursed for up to 10 months. The fawn becomes independent 10 to 12 months after birth, and attains sexual maturity at 16 to 18 months in both sexes.[9]

The sika deer may interbreed with the red deer; hybrid descendants may have adaptive advantages over purebred relatives.[9]

The average lifespan is 15 to 18 years in captivity, although one case is recorded as living 25 years and 5 months.[9]

In Nara Prefecture, Japan, the deer are also known as "bowing deer", as they bow their heads before being fed special shika senbei (鹿せんべい, called "deer cookies"). However, deer bow heads to signal that they are about to headbutt. Therefore, when a human 'bows' to a deer, the deer will assume the same stance and may charge and injure the human. Deer headbutt both for play and to assert dominance, as do goats. Sika deer are found throughout the city of Nara and its many parks and temples like Tōdai-ji, as they are considered to be the messengers of the Shinto gods.

Habitat

Sika deer are found in the temperate and subtropical forests of eastern Asia, preferring areas with dense understory, and where snowfall does not exceed 10–20 cm (3.9–7.9 in). They tend to forage in patchy clearings of forests. Introduced populations are found in areas with similar habitats to their native ranges, including Western and Central Europe, Eastern United States, and New Zealand.

Population

A Formosan sika deer.

The sika deer inhabits temperate and subtropical woodlands, which often occupy areas suitable for farming and other human exploitation. Its range encompasses some of the most densely populated areas in the world, where forests were cleared hundreds of years ago. Their population status varies significantly in different countries. Although the species as a whole is thriving, it is endangered and extinct in many areas.

Japan has by far the largest native sika population in the world. Though the exact population is uncertain, it is likely to be in the hundred thousand range and is still increasing, mainly due to recent conservation efforts and the extinction of its main predator, the wolf (Canis lupus hodophilax), over a century ago. Without its main enemy, the population of sika exploded and it is now overpopulated in many areas, posing a threat to both forests and farmlands. Efforts are now being made to control its population instead of conserving it. None of its subspecies is endangered except the Kerama deer (C. n. keramae) in the tiny Kerama Islands.[2] In 2015, Japanese Ministry of the Environment estimated the population at 3,080,000 in Japan, including Hokkaido.[10]

China used to have the largest population of sika, but thousands of years of hunting and habitat loss have reduced the population to less than 1,000. Of the five subspecies in China, the North China sika deer (C. n. mandarinus) is believed to be extinct in the wild since the 1930s; the Shanxi sika deer (C. n. grassianus) has not been seen in the wild since the 1980s and is also believed to be extinct in the wild. The status of Manchurian sika deer in China is unclear, though it is believed to be extinct, as well, and the sightings there are actually feral populations.

The South China sika deer (C. n. kopschi) and Sichuan sika deer (C. n. sichuanicus) are the only remaining subspecies in the wild. The former exists in fragmented populations of around 300 in southeast China, while the latter is found in a single population of over 400. The feral population is likely to be much higher than the wild, though most of them are descended from domesticated sikas of mixed subspecies. All of the subspecies are present in captivity, but a lack of suitable habitats and government efforts prevent their reintroduction.

The Formosan sika deer (C. n. taioanus) has been extinct for almost two decades before individuals from zoos were introduced to Kenting National Park; the population now numbers 200. Reintroduction programs are also under way in Vietnam, where the Vietnamese sika deer (C. n. pseudaxis) is extinct or nearly so.

Russia has a relatively large and stable population of 9,000 individuals of the Manchurian subspecies, but this is limited to a small area in Primorsky Krai. Small populations might exist in North Korea, but the political situation makes investigation impossible. The species is extinct in South Korea, with no plans for reintroduction.

Introduced populations

A Sika deer outside of a store on the island of Miyajima.

Sika deer have been introduced into a number of other countries, including Estonia, Latvia, Lithuania, Austria, Belgium, Denmark, France, Germany, Ireland, Netherlands, Norway, Switzerland, Russia, Romania, New Zealand, Australia, the Philippines (Jolo Island), Poland, Sweden, Finland, Canada, the United Kingdom, and the United States (Maryland, Oklahoma, Nebraska, Pennsylvania, Wisconsin, Virginia, Indiana, Michigan, Minnesota, Maine, Wyoming, Washington, and Kansas).[11] In many cases, they were originally introduced as ornamental animals in parklands, but have established themselves in the wild. On Spieden Island in the San Juan Islands of Washington, they were introduced as a game animal.

In the UK and Ireland, several distinct feral populations now exist.[12] Some of these are in isolated areas, for example on the island of Lundy, but others are contiguous with populations of the native red deer. Since the two species sometimes hybridise, there is a serious conservation concern.[13] In research which rated the negative impact of introduced mammals in Europe, the sika deer was found to be among the most damaging to the environment and economy, along with the brown rat and muskrat.[14]

In the 1900s, King Edward VII presented a pair of sika deer to John, the second Baron Montagu of Beaulieu. This pair escaped into Sowley Wood and were the basis of the sika to be found in the New Forest today. They were so prolific, culling had to be introduced in the 1930s to control their numbers.[15]

Hunting

Tsukioka Yoshitoshi Ukiyo-e depicting the Minamoto no Tsunemoto hunting a sika with a yumi.

Across its original range and in many areas to which it has been introduced, the sika is regarded as a particularly prized and elusive sportsman's quarry. In Britain, Ireland, and mainland Europe, sika display very different survival strategies and escape tactics from the indigenous deer. They have a marked tendency to use concealment in circumstances when red deer, for example, would flee, and have been seen to squat and lie belly-flat when danger threatens.

In the British Isles, sika are widely regarded as a serious threat to new and established woodlands, and public and private forestry bodies adopt policies of rigorous year-round culling.[16]

The main predator of sika deer include tiger and wolves[9], leopard, brown bear. Lynx and golden eagle targeted fawn.

Velvet antler

A tame deer wandering the streets of Miyajima, Japan.

Velvet antler (dried immature antlers) is a popular ingredient in traditional Chinese medicine, and sika in China were domesticated long ago for the antler trade, along with several other species. In Taiwan, both Formosan sika deer and Formosan sambar deer (Cervus unicolor swinhoei) have been farmed for velvet antlers. Japan is the only country in eastern Asia where sika deer were not farmed for velvet antlers.

Other deer raised for the antler trade were Thorold's deer (Cervus albirostris), central Asian red deer (Cervus affinis) and American elk (Cervus canadensis).

See also

References

  1. 1 2 3 Harris, R.B. (2008). "Cervus nippon". IUCN Red List of Threatened Species. Version 2008. International Union for Conservation of Nature. Retrieved 5 April 2009. Database entry includes a brief justification of why this species is of least concern.
  2. 1 2 Kaji, Koichi; Takashi Saitoh; Hiroyuki Uno; Hiroyuki Matsuda; Kohji Yamamura. "Adaptive management of sika deer populations in Hokkaido, Japan: theory and practice" (PDF). Retrieved 19 January 2011.
  3. ↑ Ludt, Christian J.; Wolf Schroeder; Oswald Rottmann; Ralph Kuehn. "Mitochondrial DNA phylogeography of red deer (Cervus elaphus)" (PDF). Molecular Phylogenetics and Evolution 31 (2004) 1064–1083. Elsevier. Archived from the original (PDF) on 27 September 2004. Retrieved 6 October 2006.
  4. ↑ Geist, Valerius (1998). Deer of the World: Their Evolution, Behavior, and Ecology. Mechanicsburg, Pa: Stackpole Books. ISBN 0-8117-0496-3.
  5. ↑ "ITIS Standard Report Page: Cervus nippon soloensis". Retrieved 14 February 2016.
  6. 1 2 Landesman, N. "Sika deer, Japanese deer". Ultimate Ungulate.
  7. ↑ Sika Deer. Bds.org.uk. Retrieved on 2012-08-23.
  8. ↑ Nowak, R. M. 1991. Walker's Mammals of the World. Fifth Edition. Volume Two. Johns Hopkins University Press, Baltimore.
  9. 1 2 3 4 Landesman, N. "Cervus nippon". University of Michigan Museum of Zoology. Animal Diversity Web.
  10. ↑ "環境省_（お知らせ）改正鳥獣法に基づく指定管理鳥獣捕獲等事業の推進に向けたニホンジカ及びイノシシの生息状況等緊急調査事業の結果について". Retrieved 14 February 2016.
  11. ↑ "Sika Deer - North America Introduced - Big Game Hunting Records - Safari Club International Online Record Book". Retrieved 14 February 2016.
  12. ↑ https://docs.google.com/viewer?a=v&pid=sites&srcid=ZGVmYXVsdGRvbWFpbnxndWlkZXRvc3BoYWdudW18Z3g6NjA0ZDIzYmYwNWRmZDAwYw
  13. ↑ "Cross-breeding 'threat' to deer". BBC. 22 January 2009.
  14. ↑ Rats top invasive mammals table. BBC. 7 May 2010.
  15. ↑ "British Mammals: Sika Deer". BBC. 15 June 2007. Retrieved 8 October 2009.
  16. ↑ http://www.nonnativespecies.org/downloadDocument.cfm?id=355

Further reading

O'Brien, D.J., Rooney, S.M. and Hayden, T.J. 2009. A differential vulnerability to hunting between the sexes in Sika-type calves. I. Nat. J. 30: 7- 9.

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