Sika deer

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The sika deer (Cervus nippon), also known as the northern spotted deer or the Japanese deer, is a species of deer native to much of East Asia and introduced to other parts of the world. Previously found from northern Vietnam in the south to the Russian Far East in the north,<ref name="iucn status 12 November 2021" /> it was overhunted to the brink of extinction in the 19th century. Protection laws were enacted in the mid-20th century, leading to a rapid recovery of their population from the 1950s to the 1980s.<ref name="popeco">Template:Cite journal</ref>

Etymology

The name "sika deer" comes from Template:Nihongo, the Japanese word for "deer", and in Japan the species is known as the Template:Nihongo3. In Chinese, it is known as Template:Lang-zh, referring to the white fur spots on the deer's back resembling plum blossoms.

Taxonomy

The sika deer is a member of the genus Cervus, a group of deer also known as the "true" deer, within the larger deer family, Cervidae. Formerly, sika were grouped together in this genus with nine other diverse species; these animals have since been found to be genetically different, and reclassified elsewhere under different genera. Currently, deer species within the genus Cervus are the sika, the red deer (C. elaphus) of Scotland, Eurasia and Northern Africa (introduced in Argentina, Australia, New Zealand), and the wapiti, or elk (C. canadensis), of North America, Siberia and North-Central Asia.<ref name="Ludt">Template:Cite journal</ref>

DNA evidence indicates that the species formerly placed under Cervus are not as closely related as once thought, resulting in the creation of several new genera. The ancestor of all Cervus species probably originated in Central Asia and possibly resembled the sika deer.<ref name="Geist">Template:Cite book</ref> Members of this genus can crossbreed and produce hybrids in areas where they coexist. This includes sika and wapiti; in the Scottish Highlands, the interbreeding of native Scottish red deer with introduced sika has been deemed a serious threat to the gene pool of the Scottish deer.<ref>Template:Cite web</ref> However, by comparison, an invasive sika deer in the United States cannot reproduce with a North American white-tailed, mule or black-tailed deer, all of which are placed in a separate genus, Odocoileus.

Subspecies

Serious genetic pollution has occurred in many populations, especially in China, so the status of many subspecies remains unclear.<ref name="iucn status 12 November 2021" /> The status of C. n. hortulorum is particularly uncertain and might in fact be of mixed origin, hence it is not listed here.

Description

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.<ref>Template:Cite web</ref> 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 Template:Convert tall at the shoulder and from Template:Convert in head-and-body length. The tail measures about Template:Convert long.

The largest subspecies is the Manchurian sika deer (C. n. mantchuricus), in which males commonly weigh about Template:Convert and females weigh Template:Convert, with large stags scaling up to Template:Convert, although there had been records of Yezo sika deer bulls weighing up to Template:Convert.<ref name="大泰司ほか2011">『エゾシカは森の幸 人・森・シカの共生』p.63</ref><ref>Template:Cite book</ref> On the other end of the size spectrum, in the Japanese sika deer (C. n. nippon), males weigh Template:Convert and females weigh Template:Convert.<ref>Template:Cite web</ref><ref>Template:Cite book</ref> All sikas are compact and dainty-legged, with short, trim, wedge-shaped heads and a boisterous disposition. When alarmed, they 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 Template:Convert to more than Template:Convert, depending on the subspecies. Stags also have distinctive manes during their mating period (rut).

These deer have well-developed metatarsal and preorbital glands. The volatile components of these glands were examined from a free-ranging female. The metatarsal gland contained 35 compounds: long-chain carboxylic acids, straight-chain aldehydes, long-chain alcohols, a ketone, and cholesterol.<ref>Template:Cite journal</ref> The components of the preorbital gland were C14 through C18 straight and branched-chain fatty acids.<ref>Template:Cite journal</ref>

Behavior

Manchurian sika deer

File:Sika Deer (Cervus nippon) (W1CDR0001426 BD2).ogg

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 Template:Convert lower in elevation than summer ranges.

Lifestyles vary between individuals, with some occurring alone while others are found in single-sex groups. Large herds gather in autumn and winter. Males spend most years alone occasionally forming herds together. Females with fawns only form herds during birthing season.<ref name=adw>Template:Cite web</ref> 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 their rut, which peaks from early September through November,<ref name=woodlandtrust>Template:Cite news</ref> but may last well into the winter. Territory size varies with habitat type and size of the buck; strong, prime bucks may hold up to Template:Convert. Territories are marked by a series of shallow pits or "scrapes", which is digging holes (up to 1.6 m in wide and 0.3 m in deep) with forefeet or antlers,<ref name=adw/> into which the males urinate and from which emanates a strong, musky odor. Fights between rival males for territorial disputes, which occur by using hooves and antlers,<ref name=adw/> are sometimes fierce and long and may even be fatal.

The gestation period lasts for seven months. Hinds (does) give birth to a single fawn, weighing Template:Convert, which is nursed for up to ten months.<ref name=adw/> The mother hides her fawn in thick undergrowth immediately after giving birth, and the fawn stays very quiet and still while it waits until the mother returns to nurse it. The fawn becomes independent 10 to 12 months after birth,<ref name=woodlandtrust/><ref name=adw/> and attains sexual maturity at 16 to 18 months in both sexes. The average lifespan is 15 to 18 years in captivity, although one case is recorded as living 25 years and 5 months.<ref name=adw/>

The sika deer may interbreed with the red deer, the closest relative; hybrid descendants may have adaptive advantages over purebred relatives.<ref name=adw/>

In Nara Prefecture, Japan, the deer are also known as "bowing deer", as they have learned to bow their heads before being fed special Template:Nihongo3. However, deer also bow their head to signal that they are about to headbutt. Therefore, when a human "bows" to a deer, the deer may take it as a challenge, and will assume the same stance before charging and attempting to headbutt the person. 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 like Nara Park and temples like Tōdai-ji, as they are considered to be the messengers of the Shinto gods.<ref>Template:Cite magazine</ref><ref>Template:Cite journal</ref>

Habitat

Sika deer are found in the temperate and subtropical forests of eastern Asia, preferring areas with dense understory and occasional clearings and where snowfall does not exceed Template:Convert,<ref>Template:Cite web</ref> though in their native range they have been known to frequent areas with a maximum snow depth of up to 50 cm (19.6 in).<ref>Template:Cite journal</ref> They tend to forage in patchy clearings of forests.Template:Citation needed Introduced populations are found in areas with similar habitats to their native ranges, including Western and Central Europe, Eastern United States, and New Zealand.<ref>Template:Cite journal</ref>

Population

Formosan sika deer

Sika deer inhabit temperate and subtropical woodlands, often in areas suitable for farming and other human exploitation. Their 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. The population was estimated to be between 170,000 and 330,000 individuals in 1993,<ref>Template:Cite book</ref> mainly due to recent conservation efforts and the extinction of its main predator, the Japanese wolf (Canis lupus hodophilax), over a century ago. Without its main predator, 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) on the tiny Kerama Islands.<ref name="popeco"/> In 2015, Japanese Ministry of the Environment estimated the population at 3,080,000 in Japan, including Hokkaido.<ref>Template:Cite web</ref>

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.<ref name="iucn status 12 November 2021" /> 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 also believed to be extinct, 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 subspecies known to remain in the wild in China. 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 in the wild 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 8,500–9,000 individuals of the Manchurian subspecies,<ref name="iucn status 12 November 2021" /> 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 original stock of sika deer in South Korea is extinct, with only captive stock raised for medicine from other parts of the deer's habitat. But in June 2020, an unmanned camera located a doe and fawn which might hold proof for Korea's last native sika deer, although the claim is contested.<ref>Template:Cite web</ref>

  • Outside of a store on the island of Miyajima
    Outside of a store on the island of Miyajima
  • Tame deer wandering the streets of the town of Miyajima, Japan
    Tame deer wandering the streets of the town of Miyajima, Japan

Introduced populations

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 (in Delaware, Maryland,<ref name="SCIRB">Template:Cite web</ref> Oklahoma, Nebraska,<ref name="SCIRB" /> Pennsylvania, Wisconsin, Virginia, Indiana, Michigan,<ref name="SCIRB" /> Minnesota, Maine, New York,<ref>Template:Cite web</ref><ref>Template:Cite web</ref> Texas,<ref name="SCIRB" /> and Wyoming). 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.<ref>Template:Cite web</ref>

In the UK and Ireland, several distinct feral populations now exist, in addition to about 1000 individuals in deer parks.<ref name="putman2022">Template:Cite book</ref> Some of these are in isolated areas, for example on the island of Lundy,<ref>Template:Cite book</ref> but others are contiguous with populations of the native red deer.<ref name="putman2022" /> Since the two species sometimes hybridize, a serious conservation concern exists.<ref>Template:Cite news</ref> In the United Kingdom, Sika deer are most common in Scotland, with scattered smaller populations in England - particularly Cumbria, Lancashire, Dorset and in the New Forest - and Northern Ireland. The introduced populations of the United Kingdom are exclusively of the nominate subspecies C. n. nippon.<ref>Template:Cite web</ref>

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.<ref>Template:Cite news</ref>

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.<ref>Template:Cite web</ref> They were so prolific, culling had to be introduced in the 1930s to control their numbers.<ref>Template:Cite news</ref>

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.<ref>Template:Cite web</ref>

The main predators of sika deer include tigers, wolves,<ref name="adw"/> leopards, and brown bears. Lynx and golden eagles target fawns.

Deer farming

Velvet antler

Velvet antler (dried precalcified antlers) is a popular ingredient in traditional Chinese medicine, and sika deer were domesticated by deer farms in China long ago for the antler trade, along with several other species.<ref name="v870">Template:Cite journal</ref> 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 East 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 hanglu), and American elk (Cervus canadensis).

Cultural significance

In Shinto, the Shika Deer is considered a kind of messenger between mortals and the kami.<ref>Template:Cite news</ref>

See also

References

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Further reading

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