Arabian oryx

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Arabian oryx
Arabian oryx (oryx leucoryx).jpg
Male in Dubai Desert Conservation Reserve
CITES Appendix I (CITES) [1]
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Artiodactyla
Family: Bovidae
Subfamily: Hippotraginae
Genus: Oryx
Species:
O. leucoryx
Binomial name
Oryx leucoryx
(Pallas, 1777)

The Arabian oryx or white oryx (Oryx leucoryx) is a medium-sized antelope with a distinct shoulder bump, long, straight horns, and a tufted tail. [2] It is a bovid, and the smallest member of the genus Oryx , native to desert and steppe areas of the Arabian Peninsula. The Arabian oryx was extinct in the wild by the early 1970s, but was saved in zoos and private reserves, and was reintroduced into the wild starting in 1980.

Contents

In 1986, the Arabian oryx was classified as endangered on the IUCN Red List, and in 2011, it was the first animal to revert to vulnerable status after previously being listed as extinct in the wild. It is listed in CITES Appendix I. In 2016, populations were estimated at 1,220 individuals in the wild, including 850 mature individuals, and 6,000–7,000 in captivity worldwide. [1]

Etymology

The taxonomic name Oryx leucoryx is from the Greek orux (gazelle or antelope) and leukos (white). The Arabian oryx is also called the white oryx in English, dishon in Hebrew, [3] and is known as maha, wudhaihi, baqar al-wahsh, and boosolah in Arabic. [4]

Prussian zoologist Peter Simon Pallas introduced "oryx" into the scientific literature in 1767, adding the name to the common eland as Antilope oryx (Pallas, 1767). In 1777, he transferred the name to the Cape gemsbok. At the same time, he also described what is now called the Arabian oryx as Oryx leucoryx, giving its range as "Arabia, and perhaps Libya". In 1816, Henri Marie Ducrotay de Blainville subdivided the antelope group, adopted Oryx as a genus name, and changed the Antilope oryx of Pallas to Oryx gazella (de Blainville, 1818). In 1826, Martin Lichtenstein confused matters by transferring the name Oryx leucoryx to the scimitar oryx (now Oryx dammah) which was found in the Sudan by the German naturalists Wilhelm Friedrich Hemprich and Christian Gottfried Ehrenberg (Lichtenstein, 1826). The Arabian oryx was then nameless until the first living specimens in Europe were donated to the Zoological Society of London in 1857. Not realizing this might be the Oryx leucoryx of previous authors, Dr. John Edward Gray proposed calling it Oryx beatrix after HRH the Princess Beatrice of the United Kingdom (Gray, 1857). Though this name was to persist for many years, Oldfield Thomas renamed the scimitar oryx as Oryx algazal in 1903 (it has since been renamed Oryx dammah), and gave the Arabian oryx back its original name. The confusion between the two species has been exacerbated because both have been called the white oryx in English. [4]

Anatomy and morphology

In Yotvata Hai-Bar Nature Reserve in Israel Reem-Lavan001.jpg
In Yotvata Hai-Bar Nature Reserve in Israel

An Arabian oryx stands between 2.6 to 4.1 feet tall at the shoulder and typically weighs between 220 to 460 lb (100 to 209 kg). [5] Its coat is an almost luminous white, the undersides and legs are brown, and black stripes occur where the head meets the neck, on the forehead, on the nose, and going from the horn down across the eye to the mouth. Both sexes have long, straight or slightly curved, ringed horns which are 2 to 4.9 feet (60 to 150 centimeters) long. [5]

Arabian oryxes rest during the heat of the day. They can detect rainfall and move towards it, meaning they have huge ranges; a herd in Oman can range over 3,000 km2 (1,200 sq mi). Packs are of mixed sex and usually contain between two and 15 animals, though herds of up to 100 have been reported. Arabian oryxes are generally not aggressive toward one another, which allows herds to exist peacefully for some time. [6]

Other than humans, wolves are the Arabian oryx's only predator. In captivity and safe conditions in the wild, Arabian oryxes have a lifespan of up to 20 years. [7] In periods of drought, though, their life expectancy may be significantly reduced by malnutrition and dehydration. Other causes of death include fights between males, snakebites, disease, and drowning during floods. [8]

Distribution and habitat

Historically, the Arabian oryx probably ranged throughout most of the Middle East. In the early 1800s, they could still be found in the Sinai, Palestine, the Transjordan, much of Iraq, and most of the Arabian Peninsula. During the 19th and early 20th centuries, their range was pushed back towards Saudi Arabia, and by 1914, only a few survived outside that country. A few were reported in Jordan into the 1930s, but by the mid-1930s, the only remaining populations were in the Nafud Desert in northwestern Saudi Arabia and the Rub' al Khali in the south. [2]

In the 1930s, Arabian princes and oil company clerks started hunting Arabian oryxes with automobiles and rifles. Hunts grew in size, and some were reported to employ as many as 300 vehicles. By the middle of the 20th century, the northern population was effectively extinct. [2] The last Arabian oryx in the wild before reintroduction was reported in 1972. [9]

Arabian oryxes prefer to range in gravel deserts or hard sand, where their speed and endurance will protect them from most predators and hunters on foot. In the sand deserts in Saudi Arabia, they used to be found in the hard sand areas of the flats between the softer dunes and ridges. [2]

Arabian oryxes have been reintroduced to Oman, Saudi Arabia, Israel, the United Arab Emirates, Syria, and Jordan. A small population was introduced on Hawar Island, Bahrain, and large semi-managed populations at several sites in Qatar and the UAE. The total reintroduced population is now estimated to be around 1,000. This puts the Arabian oryx well over the threshold of 250 mature individuals needed to qualify for endangered status. However, the majority of the population is concentrated in Saudi Arabia. [1]

Ecology

Feeding

The diets of the Arabian oryx consist mainly of grasses, but they eat a large variety of vegetation, including buds, herbs, fruit, tubers and roots. Herds of Arabian oryxes follow infrequent rains to eat the new plants that grow afterwards. They can go for several weeks without water. [6] Research in Oman has found grasses of the genus Stipagrostis are primarily taken; flowers from Stipagrostis plants appeared highest in crude protein and water, while leaves seemed a better food source with other vegetation. [10]

Behavior

When the Arabian oryx is not wandering its habitat or eating, it digs shallow depressions in the soft ground under shrubs or trees for resting. They can detect rainfall from a distance and follow in the direction of fresh plant growth. The number of individuals in a herd can vary greatly (up to 100 have been reported occasionally), but the average is 10 or fewer individuals. [11] Bachelor herds do not occur, and single territorial males are rare. Herds establish a straightforward hierarchy that involves all females and males above the age of about seven months. [12] Arabian oryxes tend to maintain visual contact with other herd members, with subordinate males taking positions between the main body of the herd and the outlying females. If separated, males will search areas where the herd last visited, settling into a solitary existence until the herd's return. Where water and grazing conditions permit, male Arabian oryxes establish territories. Bachelor males are solitary. [7] A dominance hierarchy is created within the herd by posturing displays, which avoid the danger of serious injury their long, sharp horns could potentially inflict. Males and females use their horns to defend the sparse territorial resources against interlopers. [13]

Adaptations for desert environments

The Arabian oryx changes its physiology and behaviour at different times of the year to increase survival during times when food and water are in limited supply. During the summer, when droughts are common in the desert environments where it lives, the Arabian oryx will drastically reduce its minimal fasting metabolic rate by lying completely inactive beneath shade trees during the day and ranging over smaller areas at night to forage. [14] By letting its body temperature rise during the heat of the day, it uses less evaporative cooling and retains more body water, and at night, the cool night air lowers its temperature back to the normal range. [15] The oryx’s arterial blood temperature is partly powered by a network of small arterial vessels with a large surface area called the rete mirabile, which branches from the two carotid arteries to the brain and allows for heat exchange between warm arterial blood and the cooler blood in the sinus cavities. [15] Because of these changes in behaviour and physiology, it was shown that Arabian oryx can reduce their urine volume, faecal water loss, and resting metabolic rate by at least 50%, [16] demonstrating how efficient these animals are at surviving in times when water and food are scarce.

Importance to humans

South Arabian fragment of a stela, depicts a reclining ibex and three Arabian oryx heads. The ibex was one of the most sacred animals in South Arabia, while the oryx antelope was associated with the god Attar, 5th century BC. South Arabian - Fragment of a Frieze with an Ibex and Oryxes - Walters 2138.jpg
South Arabian fragment of a stela, depicts a reclining ibex and three Arabian oryx heads. The ibex was one of the most sacred animals in South Arabia, while the oryx antelope was associated with the god Attar, 5th century BC.

The Arabian oryx is the national animal of Jordan, Oman, the United Arab Emirates, [17] Bahrain, and Qatar. [18]

The Arabian oryx is also the namesake of several businesses on the Arabian peninsula, notably Al Maha Airways and Al Maha Petroleum.

In the King James Version of the Bible, the word re’em is translated as 'unicorn'. In Modern Hebrew, the name re'em laban, meaning white oryx, is used in error for the scimitar-horned oryxes living in the sanctuary Yotvata Hai Bar near Eilat. [19] The scimitar oryx is called re'em Sahara. The Arabian name ri'ïm is the equivalent of the Hebrew name re'em, also meaning white oryx, suggesting a borrowing from the Early Modern Era.

A Qatari oryx named "Orry" was chosen as the official games mascot for the 2006 Asian Games in Doha, [20] and is shown on tailfins of planes belonging to Middle Eastern airline Qatar Airways.

Unicorn myth

The myth of the one-horned unicorn may be based on oryxes that have lost one horn. Aristotle and Pliny the Elder held that the oryx was the unicorn's "prototype". [21] From certain angles, the oryx may seem to have one horn rather than two, [22] [23] and given that its horns are made from hollow bone that cannot be regrown, if an Arabian oryx were to lose one of its horns, for the rest of its life, it would have only one. [21]

Another source for the concept may have originated from the translation of the Hebrew word re'em into Greek as μονόκερως, monokeros, in the Septuagint. [24] In Psalm 22:21, the word karen, meaning horn, is written in singular. The Roman Catholic Vulgata and the Douay-Rheims Bible translated re'em as rhinoceros; other translations are names for a wild bull, wild oxen, buffalo, or gaur, but in some languages, a word for unicorn is maintained. The Arabic translation alrim is the correct choice etymologically, meaning 'white oryx'. [25]

Conservation

Arabian onyx in Al Ain Zoo Arabian Oryx (8454554499).jpg
Arabian onyx in Al Ain Zoo

The Phoenix Zoo and the Fauna and Flora Preservation Society of London (now Fauna and Flora International), with financial help from the World Wildlife Fund, are credited with saving the Arabian oryx from extinction. In 1962, these groups started the first captive-breeding herd in any zoo, at the Phoenix Zoo, sometimes referred to as "Operation Oryx". [26] [27] Starting with nine animals, the Phoenix Zoo has had over 240 successful births. From Phoenix, Arabian oryxes were sent to other zoos and parks to start new herds.

In 1968, Sheikh Zayed bin Sultan Al Nahyan of Abu Dhabi, out of concern for the land's wildlife, particularly ungulates such as the Arabian oryx, founded the Al Ain Zoo to conserve them. [28]

Arabian oryxes were hunted to extinction in the wild by 1972. By 1980, the number of Arabian oryxes in captivity had increased to the point that Arabian oryx reintroduction was started. The first release, to Oman, was attempted with Arabian oryxes from the San Diego Wild Animal Park. [29] Although numbers in Oman have declined, there are now wild populations in Saudi Arabia and Israel, [30] [31] as well. One of the largest populations is found in Mahazat as-Sayd Protected Area, a large, fenced reserve in Saudi Arabia, covering more than 2,000  km2. [1]

On June 28, 2007, Oman's Arabian Oryx Sanctuary was the first site ever to be removed from the UNESCO World Heritage List. UNESCO's reason for this was the Omani government's decision to open 90% of the site to oil prospecting. The Arabian oryx population on the site has been reduced from 450 in 1996 to only 65 in 2007. Now, fewer than four breeding pairs are left on the site. [32] [ needs update ]

In June 2011, the Arabian oryx was relisted as vulnerable by the IUCN Red List. The IUCN estimated there were more than 1,200 Arabian oryx in the wild as of 4 December 2020 2016, with 6,000–7,000 held in captivity worldwide in zoos, preserves, and private collections. Some of these are in large, fenced enclosures (free-roaming), including those in Syria (Al Talila), Bahrain, Qatar, and the UAE. [1] This is the first time the IUCN has reclassified a species as vulnerable after it had been listed as extinct in the wild. [33] The Arabian oryx is also listed in CITES Appendix I. [1]

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References

  1. 1 2 3 4 5 6 7 IUCN SSC Antelope Specialist Group (2017). "Oryx leucoryx". IUCN Red List of Threatened Species . 2017: e.T15569A50191626. doi: 10.2305/IUCN.UK.2017-2.RLTS.T15569A50191626.en . Retrieved 16 January 2022.
  2. 1 2 3 4 Talbot, L.M. (1960). A Look at Threatened Species. The Fauna Preservation Society. pp. 84–91.
  3. ↑ Slifkin, Nathan, The Torah encyclopedia of the Animal kingdom, vol.1, OU Press, New York, 2015, pp.272-275
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  5. 1 2 "Oryx | San Diego Zoo Animals & Plants". animals.sandiegozoo.org. Retrieved 2023-03-26.
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  8. ↑ "The Oryx Facts". The Arabian Oryx Project. Archived from the original on 12 January 2008. Retrieved 2008-01-27.
  9. ↑ Stanley-Price, Mark (July–August 1982). "The Yalooni Transfer". Saudi Aramco World. Archived from the original on 2011-06-10. Retrieved 31 December 2012.
  10. ↑ Spalton, J. A. (1999). "The food supply of Arabian oryx (Oryx leucoryx) in the desert of Oman". Journal of Zoology. 248 (4): 433–441. doi:10.1111/j.1469-7998.1999.tb01043.x.
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  12. ↑ How to go wild. New Scientist (1989-10-28). Retrieved on 2013-01-01.
  13. ↑ Science & Nature – Wildfacts – Arabian oryx. BBC (2012-04-27). Retrieved on 2013-01-01.
  14. ↑ Williams, Joseph B.; Ostrowski, Stéphane; Bedin, Eric; Ismail, Khairi (2001-07-01). "Seasonal variation in energy expenditure, water flux and food consumption of Arabian oryx Oryx leucoryx". Journal of Experimental Biology. 204 (13): 2301–2311. doi:10.1242/jeb.204.13.2301. ISSN   1477-9145. PMID   11507113.
  15. 1 2 "Animals at the extremes: The desert environment". June 10, 2019. Archived from the original on 2017-01-05. Retrieved November 8, 2021.
  16. ↑ Ostrowski, Stéphane; Williams, Joseph B.; Mésochina, Pascal; Sauerwein, Helga (2005-11-09). "Physiological acclimation of a desert antelope, Arabian oryx (Oryx leucoryx), to long-term food and water restriction". Journal of Comparative Physiology B. 176 (3): 191–201. doi:10.1007/s00360-005-0040-0. ISSN   0174-1578. PMID   16283332. S2CID   14680361.
  17. ↑ "The UAE National Symbols..." TEACH United Arab Emirates. Jess Jumeira School. 2 (2). Nov–Dec 2014.
  18. ↑ Tamra Orr (30 June 2008). Qatar . Marshall Cavendish. p.  13. ISBN   978-0-7614-2566-3 . Retrieved 30 July 2011.
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  20. ↑ "Mascot of Asian Games 2006". Travour.com. Archived from the original on 16 February 2008. Retrieved 2008-02-07.
  21. 1 2 Rice, M. (1994). The Archaeology of the Arabian Gulf, c. 5000–323 BC. Routledge. p. 63. ISBN   0-415-03268-7.
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  24. ↑ Gerritsen, Wim (June 2005). "Bestaat de Eenhoorn;of Hoe de wetenschap de bijbel de baas werd". De Groene Amsterdammer.
  25. ↑ "Smith & Van Dyke Arabic Bible translation - Deuteronomium 33:17". Bible Hub.
  26. ↑ The Arabian Oryx Project – Timeline. oryxoman.com
  27. ↑ Phoenix Zoo Species Survival Plan Archived 2011-07-16 at the Wayback Machine . Phoenixzoo.org (2006-01-03). Retrieved on 2013-01-01.
  28. ↑ "History". Al Ain Zoo. 15 October 2017. Retrieved 2019-03-18.
  29. ↑ Stanley-Price, Mark (July–August 1982). "The Yalooni Transfer". Saudi Aramco World. Archived from the original on 2011-06-10. Retrieved 31 December 2012.
  30. ↑ Saltz, D. (1998). "A long-term systematic approach to planning reintroductions: the Persian fallow deer and the Arabian oryx in Israel". Animal Conservation. 1 (4): 245. doi:10.1111/j.1469-1795.1998.tb00035.x. S2CID   85943063.
  31. ↑ Gilad, O.; Grant, W.E. & Saltz, D. (2008). "Simulated dynamics of Arabian Oryx (Oryx leucoryx) in the Israeli Negev: Effects of migration corridors and post-reintroduction changes in natality on population viability". Ecological Modelling. 210 (1–2): 169. doi:10.1016/j.ecolmodel.2007.07.015.
  32. ↑ "Oman's Arabian Oryx Sanctuary: first site ever to be deleted from UNESCO's World Heritage List". UNESCO World Heritage Centre. Archived from the original on 18 January 2008. Retrieved 2008-01-16.
  33. ↑ Platt, John (17 June 2011). "Arabian Oryx Makes History as First Species to Be Upgraded from "Extinct in the Wild" to "Vulnerable"". scientificamerican.com. Retrieved 20 June 2011.

Further reading

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