The elk (Cervus canadensis) or wapiti is one of the largest species within the deer family, Cervidae, and one of the largest terrestrial mammals in North America and Northeast Asia. It is not to be confused with the still larger moose (Alces alces) of North America, alternatively known as "elk" in British English and related names in other European languages (German Elch, Swedish älg, French élan), in reference to populations in Eurasia. Elk range in forest and forest-edge habitat, feeding on grasses, plants, leaves, and bark. Male elk have large antlers which are shed each year. Males also engage in ritualized mating behaviors during the rut, including posturing, antler wrestling (sparring), and bugling, a loud series of vocalizations that establishes dominance over other males and attracts females.

Elk
Temporal range: 2.5–0 Ma
Early Pleistocene – Recent
Rocky Mountain Bull Elk.jpg
A bull (male) in Nebraska
Cervus canadensis (North American elk) 9 (8290359165).jpg
A cow (female) in Colorado
Scientific classification edit
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Artiodactyla
Family: Cervidae
Subfamily: Cervinae
Genus: Cervus
Species:
C. canadensis
Binomial name
Cervus canadensis
(Erxleben, 1777)[2]
Subspecies
Wapiti.png
Former (light green) and current (dark green) native ranges of Cervus canadensis
Synonyms

Various Cervus elaphus subspecies

Although it is currently native to North America and eastern Asia, it had a much wider distribution in the past. Populations were present across Eurasia into Western Europe during the Late Pleistocene, and survived into the early Holocene in southern Sweden and the Alps. The elk has adapted well in countries where it has been introduced, including Argentina and New Zealand. Its adaptability may in fact threaten endemic species and the ecosystems into which it has been introduced.

Elk are susceptible to a number of infectious diseases, some of which can be transmitted to livestock. Efforts to eliminate infectious diseases from elk populations, largely by vaccination, have had mixed success. Some cultures revere the elk as having spiritual significance. In parts of Asia, antlers and their velvet are used in traditional medicines. Elk are hunted as a game species. Their meat is leaner and higher in protein than beef or chicken. Elk were long believed to belong to a subspecies of the European red deer (Cervus elaphus), but evidence from many mitochondrial DNA genetic studies beginning in 1998 shows that the two are distinct species. Key morphological differences that distinguish C. canadensis from C. elaphus are the former's wider rump patch and paler-hued antlers.

Naming and etymologyEdit

Early European explorers in North America, who were familiar with the smaller red deer of Europe, thought that the larger North American animal resembled a moose, and consequently gave it the name elk, which is the common European name for moose. The word elk is related to the Latin alces, Old Norse elgr, Scandinavian elg/älg and German Elch, all of which refer to the animal known in North America as the moose.[3] The name wapiti is from the Shawnee and Cree word waapiti, meaning "white rump".[4] The Asian subspecies are sometimes referred to as the maral, but this name applies primarily to the Caspian red deer (Cervus elaphus maral), a subspecies of the red deer. There is a subspecies of wapiti in Mongolia called the Altai wapiti (Cervus canadensis sibiricus), also known as the Altai maral.[5]

TaxonomyEdit

 
Elk crossing a rock face at Mammoth Hot Springs, Yellowstone National Park
 
Bull elk in late autumn, Banff National Park, Canada
 
Sparring bull elks in Banff National Park, Canada

Members of the genus Cervus (and hence early relatives or possible ancestors of the elk) first appear in the fossil record 25 million years ago, during the Oligocene in Eurasia, but do not appear in the North American fossil record until the early Miocene.[6] The extinct Irish elk (Megaloceros) was not a member of the genus Cervus, but rather the largest member of the wider deer family (Cervidae) known from the fossil record.[7]

Until recently, red deer and elk were considered to be one species, Cervus elaphus.[5][8] However, mitochondrial DNA studies, conducted on hundreds of samples in 2004 from red deer and elk subspecies as well as other species of the Cervus deer family, strongly indicate that elk, or wapiti, should be a distinct species, namely Cervus canadensis.[9] The previous classification had over a dozen subspecies under the C. elaphus species designation; DNA evidence concludes that elk are more closely related to Thorold's deer and even sika deer than they are to the red deer.[9] Elk and red deer produce fertile offspring in captivity, and the two species have freely inter-bred in New Zealand's Fiordland National Park, where the cross-bred animals have all but removed the pure elk blood from the area.[10] Key morphological differences that distinguish C. canadensis from C. elaphus are the former's wider rump patch and paler-hued antlers.[11]


SubspeciesEdit

There are numerous subspecies of elk described, with six from North America and four from Asia, although some taxonomists consider them different ecotypes or races of the same species (adapted to local environments through minor changes in appearance and behavior). Populations vary in antler shape and size, body size, coloration and mating behavior. DNA investigations of the Eurasian subspecies revealed that phenotypic variation in antlers, mane and rump patch development are based on "climatic-related lifestyle factors".[12] Of the six subspecies of elk known to have inhabited North America in historical times, four remain, including the Roosevelt's (C. canadensis roosevelti), tule (C. canadensis nannodes), Manitoban (C. canadensis manitobensis) and Rocky Mountain elk (C. canadensis nelsoni).[13] The eastern elk (C. canadensis canadensis) and Merriam's elk (C. canadensis merriami) subspecies have been extinct for at least a century.[14][15]

Four subspecies described in Asia include the Altai wapiti (C. canadensis sibiricus) and the Tianshan wapiti (C. canadensis songaricus). Two distinct subspecies found in China and Korea are the Manchurian wapiti (C. canadensis xanthopygus) and the Alashan wapitis (C. canadensis alashanicus). The Manchurian wapiti is darker and more reddish in coloration than the other populations. The Alashan wapiti of north central China is the smallest of all subspecies, has the lightest coloration and is the least studied.[10]

Recent DNA studies suggest that there are no more than three or four subspecies of elk. All American forms, aside from possibly the tule and Roosevelt's elk, seem to belong to one subspecies (Cervus canadensis canadensis). Even the Siberian elk (Cervus canadensis sibiricus) are more or less identical to the American forms and therefore may belong to this subspecies, too. However, the Manchurian wapiti (Cervus canadensis xanthopygus) is clearly distinct from the Siberian forms, but not distinguishable from the Alashan wapiti. The Chinese forms the Sichuan deer, Kansu red deer, and Tibetan red deer belong also to the wapitis and were not distinguishable from each other by mitochondrial DNA studies.[9] These Chinese subspecies are sometimes treated as a distinct species, namely the Central Asian red deer (Cervus wallichi), which also includes the Kashmir stag.[16]

CharacteristicsEdit

 
A herd of Roosevelt's elk

Elk have thick bodies with slender legs and short tails. They are typically 0.75–1.5 m (2 ft 6 in–4 ft 11 in) high at and shoulder with a nose-to-tail length of 1.6–2.7 m (5 ft 3 in–8 ft 10 in). Males are larger and weigh 178–497 kg (392–1,096 lb) while females weigh 171–292 kg (377–644 lb).[17] The largest of the subspecies is the Roosevelt elk (C. c. roosevelti), found west of the Cascade Range in the U.S. states of California, Oregon and Washington, and in the Canadian province of British Columbia. Roosevelt elk have been reintroduced into Alaska, where the largest males are estimated to weigh up to 600 kg (1,300 lb).[18] More typically, male Roosevelt elk weigh around 318 to 499 kg (701 to 1,100 lb), while females weigh 261 to 283 kg (575 to 624 lb).[19] Male tule elk weigh 204–318 kg (450–701 lb) while females weight 170–191 kg (375–421 lb).[20]

Antlers are made of bone which can grow at a rate of 2.5 centimeters (0.98 in) per day. While actively growing, the antlers are covered with and protected by a soft layer of highly vascularised skin known as velvet. The velvet is shed in the summer when the antlers have fully developed.[21] Bull elk typically have around six tines on each antler. The Siberian and North American elk carry the largest antlers while the Altai wapiti have the smallest.[10] A Roosevelt bull can have antlers that weight 18 kg (40 lb).[21] The formation and retention of antlers is testosterone-driven.[22] In late winter and early, the testosterone levels drop which causes the antlers to shed.[23]

 
Rocky Mountain elk

During the fall, elk grow a thicker coat of hair, which helps to insulate them during the winter.[24] Both males and female North American elk all grow thin neck manes; females of other subspecies may not.[25]:37 By early summer, the heavy winter coat has been shed, and elk are known to rub against trees and other objects to help remove hair from their bodies. All elk have small and clearly defined rump patches with short tails. They have different coloration based on the seasons and types of habitats, with gray or lighter coloration prevalent in the winter and a more reddish, darker coat in the summer. Subspecies living in arid climates tend to have lighter colored coats than do those living in forests.[24] Most have lighter yellow-brown to orange-brown coats in contrast to dark brown hair on the head, neck, and legs during the summer. Forest-adapted Manchurian and Alashan wapitis have red or reddish-brown coats with less contrast between the body coat and the rest of the body during the summer months. Calves are born spotted, as is common with many deer species, and they lose their spots by the end of summer. Adult Manchurian wapiti may retain a few orange spots on the back of their summer coats until they are older. This characteristic has also been observed in the forest-adapted European red deer.[10]

Behavior and ecologyEdit

 
Elk bulls sparing

Elk are among the most gregarious deer species.[25]:52 During the summer, group size can reach 400 individuals.[17] For most of the year, adult males and female are segregated into different herds. Female herds are larger while bull form small groups and may even travel alone. Young bulls may associate with older bulls or with female groups. Male and female herds come together during the mating season, which may begin in late August.[25]:75, 82 During this time, bulls enter the rut and compete for females to include in their harems.[25]:92 Males try to intimate rivals by vocalizing and displaying with their antlers.[25]:109 If neither bull backs down, they engage in antler wrestling, and bulls sometimes sustain serious injuries.[26] Bulls also dig holes in the ground called wallows, in which they urinate and roll their bodies.[27][26] A male elk's urethra points upward so that urine is sprayed almost at a right angle to the penis.[28] The urine soaks into their hair and gives them a distinct smell which attracts cows.[26]

Dominant bulls follow groups of cows during the rut, from August into early winter. A bull will defend his harem of 20 cows or more from competing bulls and predators.[29] A bull interacts with cows in his harem in two ways; herding and courtship. When a female wanders too far away from the range of the harem, the male will rush ahead of her, block her path and aggressively rushes her back to the harem. Herding behavior is accompanied a stretched out and lowered neck and the antlers layed back. A bull may get violent and hit the cow with his antlers. During courtship, the bull is more peaceful and approaches her with his head and antlers raised. The male signals his intention to test the female for sexual receptivity by flicking his tongue. If not ready, a cow will lower her head and weave from side to side while opening and closing her mouth. The bull will stop in response in order to not scare her.[25]:100–101 Otherwise, the bull will copiously lick the female and then mount her.[25]:115

Younger, less dominant bulls, known as "spike bulls" due to their antlers not yet being forked, will harass unguarded cows. These bulls are impatient and will not reform any courtship rituals and will continue to pursue a female even when she signals him to stop. As such, they are less reproductively successful and a cow may stay close to the big bull to avoid harassment. Dominant bulls are intolerant of spike bulls and will chase them away from their harems.[25]:100–105

Bulls have a loud, high-pitched, whistle-like vocalization known as bugling, which advertise the male's fitness over great distances. Unusual for a vocalization produced by a large animal, buglings can reach a frequency of 4000 Hz. This is achieved by blowing air from the glottis through the nasal cavities. Elk can produce deeper pitched (150 Hz) sounds using the larynx.[30]

Reproduction and lifecycleEdit

 
Female nursing young

Female elk have a short estrus cycle of only a day or two, and matings usually involve a dozen or more attempts. By the autumn of their second year, females can produce one and, very rarely, two offspring, although reproduction is most common when cows weigh at least 200 kilograms (440 lb).[31] The gestation period is 240 to 262 days and the offspring weigh between 15 and 16 kilograms (33 and 35 lb). When the females are near to giving birth, they tend to isolate themselves from the main herd, and will remain isolated until the calf is large enough to escape predators.[26]

Calves are born spotted, as is common with many deer species, and they lose their spots by the end of summer. Manchurian wapiti may retain a few orange spots on the back of their summer coats until they are older. After two weeks, calves are able to join the herd, and are fully weaned at two months of age.[17] Elk calves are as large as an adult white-tailed deer by the time they are six months old.[32] Elk will leave their natal (birth) ranges before they are three years old. Males disperse more often then females as adult cows are more tolerant of female offspring from previous years.[33] Elk live 20 years or more in captivity but average 10 to 13 years in the wild. In some subspecies that suffer less predation, they may live an average of 15 years in the wild.[34]

Predators and defensive tacticsEdit

 
Single bull elk in winter are vulnerable to predation by wolves

Predators of elk include wolves, coyotes, bears, cougars and Siberian tigers.[35][36] Coyote packs mostly prey on elk calves, though they can sometimes take a winter- or disease-weakened adult.[37] In the Greater Yellowstone Ecosystem which includes Yellowstone National Park, bears are the most significant predators of calves.[38]

Living in groups lessens the risk of an individual falling to predation. Large bull elk are less vulnerable and thus can afford to wander alone, while cows stay in larger groups for protection of their calves.[25]:75 Elk may also avoid predation by switching from grazing to browsing, the former of which puts itself in a compromising situation of being in such an open area with its head down, where it cannot watch what is going on in the surrounding area.[39] Bulls are more vulnerable to predation by wolves in late winter, after they have been weakened by months of chasing females and fighting.[40] Males that have recently lost their antlers are more likely to be preyed on.[41] The killing of cows in their prime is more likely to effect population growth than the killing of bulls.[40]

MigrationEdit

 
Elk wintering in Jackson Hole, Wyoming, after migrating there during the fall

As is true for many species of deer, especially those in mountainous regions, elk migrate into areas of higher altitude in the spring, following the retreating snows, and the opposite direction in the fall. Hunting pressure also impacts migration and movements.[42] During the winter, they favor wooded areas for the greater availability of food to eat. Elk do not appear to benefit from thermal cover.[43] The Greater Yellowstone Ecosystem elk herd numbers over 200,000 individuals and during the spring and fall, they take part in the longest elk migration in the continental U.S. Elk in the southern regions of Yellowstone National Park and in the surrounding National Forests migrate south towards the town of Jackson, Wyoming, where they winter for up to six months on the National Elk Refuge. Conservationists there ensure the herd is well fed during the harsh winters.[44]

DietEdit

 
Elk pellet group

Elk are ruminants and therefore have four-chambered stomachs. Unlike white-tailed deer and moose, which are primarily browsers, elk are similar to cattle in that they are primarily grazers. But like other deer, they also browse.[45][46] Elk have a tendency to do most of their feeding in the mornings and evenings, seeking sheltered areas in between feedings to digest. Their diets vary somewhat depending on the season, with native grasses being a year-round supplement, tree bark being consumed in winter and forbs and tree sprouts during the summer. Elk consume an average of 9.1 kilograms (20 lb) of various vegetation daily.[47] Particularly fond of aspen sprouts which rise in the spring, elk have had some impact on aspen groves which have been declining in some regions where elk exist.[48] Range and wildlife managers conduct surveys of elk pellet groups to monitor populations and resource use.[49][50]

Parasites and diseaseEdit

At least 53 species of protist and animal parasites have been identified in elk.[51] Most of these parasites seldom lead to significant mortality among wild or captive elk. Parelaphostrongylus tenuis (brainworm or meningeal worm) is a parasitic nematode known to affect the spinal cord and brain tissue of elk and other species, leading to death.[52] The definitive host is the white-tailed deer, in which it normally has no ill effects. Snails and slugs, the intermediate hosts, can be inadvertently consumed by elk during grazing.[3] The liver fluke Fascioloides magna and the nematode Dictyocaulus viviparus are also commonly found parasites that can be fatal to elk.[53] Since infection by either of these parasites can be lethal to some commercial livestock species, their presence in elk herds is of some concern.

 
A bull elk in spring, shedding its winter coat and with its antlers covered in velvet

Chronic wasting disease, transmitted by a misfolded protein known as a prion, affects the brain tissue in elk, and has been detected throughout their range in North America. First documented in the late 1960s in mule deer, the disease has affected elk on game farms and in the wild in a number of regions. Elk that have contracted the disease begin to show weight loss, changes in behavior, increased watering needs, excessive salivation and urinating and difficulty swallowing, and at an advanced stage, the disease leads to death. No risks to humans have been documented, nor has the disease been demonstrated to pose a threat to domesticated cattle.[54] In 2002, South Korea banned the importation of elk antler velvet due to concerns about chronic wasting disease.[55]

The Gram-negative bacterial disease brucellosis occasionally affects elk in the Greater Yellowstone Ecosystem, the only place in the U.S. where the disease is still known to exist. In domesticated cattle, brucellosis causes infertility, abortions, and reduced milk production. It is transmitted to humans as undulant fever, producing influenza-like symptoms that may last for years. Though bison are more likely to transmit the disease to other animals, elk inadvertently transmitted brucellosis to horses in Wyoming and cattle in Idaho. Researchers are attempting to eradicate the disease through vaccinations and herd-management measures, which are expected to be successful.[56] Nevertheless, research has been ongoing since 2002, and a successful vaccine has yet to be developed as of 2016.[57]

A recent necropsy study of captive elk in Pennsylvania attributed the cause of death in 33 of 65 cases to either gastrointestinal parasites (21 cases, primarily Eimeria sp. and Ostertagia sp.) or bacterial infections (12 cases, mostly pneumonia).[58]

Elk hoof disease was first noticed in the state of Washington in the late 1990s in the Cowlitz River basin, with sporadic reports of deformed hooves. Since then, the disease has spread rapidly with increased sightings throughout southwest Washington and into Oregon. The disease is characterised by deformed, broken, or missing hooves and leads to severe lameness in elk. The primary cause is not known, but it is associated with treponeme bacteria, which are known to cause digital dermatitis in commercial livestock. The mode of transmission is also not known, but it appears to be highly contagious among elk. Studies are being undertaken by government departments to determine how to halt or eliminate the disease.[59][60][61]

DistributionEdit

 
Bull elk bugling during the rut

Modern subspecies are descended from elk that once inhabited Beringia, a steppe region between Asia and North America that connected the two continents during the Pleistocene. Beringia provided a migratory route for numerous mammal species, including brown bear, camel, horse, caribou, and moose, as well as humans.[62] As the Pleistocene came to an end, ocean levels began to rise; elk migrated southwards into Asia and North America. In North America they adapted to almost all ecosystems except for tundra, true deserts, and the gulf coast of the U.S. The elk of southern Siberia and central Asia were once more widespread but today are restricted to the mountain ranges west of Lake Baikal including the Sayan and Altai Mountains of Mongolia and the Tianshan region that borders Kyrgyzstan, Kazakhstan, and China's Xinjiang Province.[1] The habitat of Siberian elk in Asia is similar to that of the Rocky Mountain subspecies in North America. During the Late Pleistocene their range was much more extensive, being distributed across Eurasia, with remains being found as far west as France. These populations are most closely related to modern Asian populations of the elk. Their range collapsed at the start of the Holocene, due to them being specialized to cold periglacial tundrasteppe habitat, which was largely replaced with closed forest, being outcompeted by red deer in these conditions. Relictual populations survived into the early Holocene in southern Sweden and the Alps, where the environment remained favorable.[63]

IntroductionsEdit

 
Bull elk on a captive range in Nebraska. These elk, originally from Rocky Mountain herds, exhibit modified behavior due to having been held in captivity, under less selective pressure

The Rocky Mountain elk subspecies has been reintroduced by hunter-conservation organizations in the Appalachian region of the eastern U.S., where the now extinct eastern elk once lived.[64] Since the late 1990s, elk were reintroduced and recolonized in the states of Kentucky, North Carolina and Tennessee, Virginia and West Virginia.[65] In 2017, a male elk, likely from the Smoky Mountains population, was sighted in South Carolina for the first time in nearly 300 years.[66] Elk have also been reintroduced to a number of other states, including Pennsylvania,[67][68] Michigan, Wisconsin, Missouri [69] and Etolin and Afognak Islands in Alaska.[70] Reintroduction of the elk into Ontario began in the early 20th century, and is ongoing with limited success.[71] As of 1989, population figures for the Rocky Mountain subspecies were 782,500, and estimated numbers for all North American subspecies exceeded 1 million.[72] Prior to the European colonization of North America, there were an estimated 10 million elk on the continent.[73]

Outside their native habitat, elk and other deer species, especially white-tailed deer, were introduced in areas that previously had few, if any, large native ungulates. Brought to these countries for hunting and ranching for meat, hides and antler velvet, they have proven highly adaptable and have often had an adverse impact on local ecosystems. Elk and red deer were introduced to Argentina in the early 20th century.[74] There they are now considered an invasive species, encroaching on Argentinian ecosystems where they compete for food with the indigenous Chilean huemul and other herbivores.[75] This negative impact on native animal species has led the IUCN to identify the elk as one of the world's 100 worst invaders.[76]

The introduction of deer to New Zealand began in the middle of the 19th century, and current populations are primarily European red deer, with only 15 percent being elk.[77] There is significant hybridization of elk with the more numerous red deer to the extent that pure elk may no longer exist in the wild in New Zealand. These deer have had an adverse impact on forest regeneration of some plant species, as they consume more palatable species which are replaced with those that are less favored by the elk. The long-term impact will be an alteration of the types of plants and trees found, and in other animal and plant species dependent upon them.[78] As in Chile and Argentina, the IUCN has declared that red deer and elk populations in New Zealand are an invasive species.[76]

Cultural referencesEdit

 
A Kiowa couple. The woman on the right is wearing an elk tooth dress.

Elk have played an important role in the cultural history of a number of peoples. Neolithic petroglyphs from Asia depict antler-less female elk, which have been interpreted as symbolizing life and sustenance. They were also frequently overlaid with boats and associated with rivers, suggesting that they also represented paths to the underworld.[79] Petroglyphs of elk were carved into cliffs by the Anasazi of the southwestern U.S. hundreds of years ago.[80] The elk was of particular importance to the Lakota, and played a spiritual role in their society. The male elk was admired for its ability to attract mates and Lakota men will play a courting flute imitating a bugling elk to attract women. Men would like use elk antlers as love charms and wore clothes decorated with elk images.[81]

The Rocky Mountain elk is the official state animal for Utah.[82] An image of an elk and a moose appear on the state seal and flag of Michigan.[83] The Benevolent and Protective Order of Elks (B.P.O.E.) chose the elk as its namesake because a number of its attributes seemed appropriate for cultivation by members of the fraternity. A representation of the majestic head of the male, with its spreading antlers, was adopted as the first badge of the Order; and is still the most conspicuous element of its copyrighted fraternal emblem.[84] A prized possession of many members of the B.P.O.E. are jewel encrusted, gold mounted elk teeth – which are actually ivory.[85]

Commercial usesEdit

 
Approximately 0.45 kg (1 lb) of ground elk meat formed into patties; they have relatively low fat content

Although breakdown figures for each game species are not available in the 2006 National Survey from the U.S. Fish and Wildlife Service, hunting of wild elk is most likely the primary economic impact.[86]

While elk are not generally harvested for meat production on a large scale, some restaurants offer the meat as a specialty item and it is also available in some grocery stores. The meat has a taste somewhere between beef and venison and is higher in protein and lower in fat and cholesterol than beef, pork, and chicken.[87] Elk meat is also a good source of iron, phosphorus and zinc.[88]

A male elk can produce 10 to 11 kilograms (22 to 24 lb) of antler velvet annually and on ranches in the United States, Canada and New Zealand, this velvet is collected and sold to markets in East Asia, where it is used in medicine. Velvet is also considered by some cultures to be an aphrodisiac.[55] However, consuming velvet from elk in North America may be risky since velvet from animals infected with chronic wasting disease may contain prions that could result in a human getting variant Creutzfeldt–Jakob disease.[89]

Antlers are also used in artwork, furniture and other novelty items. All Asian subspecies, along with other deer, have been raised for their antlers in central and eastern Asia by Han Chinese, Turkic peoples, Tungusic peoples, Mongolians, and Koreans. Elk farms are relatively common in North America and New Zealand.[77] Elk hides have been used by Native Americans for tepee covering, clothing and footwear.[90][91]

Since 1967, the Boy Scouts of America have assisted employees at the National Elk Refuge in Wyoming by collecting the antlers which are shed each winter. The antlers are then auctioned, with 80% of the proceeds returned to the refuge. In 2010, 2,520 kilograms (5,560 lb) of antlers were auctioned, bringing in over $46,000.[92]

ReferencesEdit

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