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Gemsbok

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This article is about the African antelope. For the European goat-antelope called "gemsbok" in Dutch, see Chamois.

Gemsbok
Male gemsbok in Etosha National Park, Namibia
Gemsboks mock fighting at Leeudril, Nossob River, Kgalagadi Transfrontier Park, Northern Cape, South Africa

Apparently Secure  (NatureServe)[2]
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Artiodactyla
Family: Bovidae
Subfamily: Hippotraginae
Genus: Oryx
Species:
O. gazella
Binomial name
Oryx gazella
The natural range of the gemsbok[3]
Synonyms

Capra gazella Linnaeus, 1758

The gemsbok (Oryx gazella), or South African oryx, is a large antelope in the genus Oryx. It is endemic to the dry and barren regions of Botswana, Namibia, South Africa and (parts of) Zimbabwe, mainly inhabiting the Kalahari and Namib Deserts, areas in which it is supremely adapted for survival. Previously, some sources classified the related East African oryx, or beisa oryx (Oryx beisa), as a subspecies.

Name

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The name gemsbok is from Afrikaans, which itself is from the Dutch word of the same spelling, meaning "male chamois", composed of gems (“chamois”) + bok (“buck, male goat”).[4] The Dutch gems is further from German Gämse ("chamois").[5] Although some superficial similarities in appearance (especially in the facial pattern) are noticed, the chamois and the oryx are not closely related. The usual pronunciation in English is /ˈɡɛmzbɒk/.[6]

Description

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Gemsbok are light taupe to tan in color, with lighter patches toward the bottom rear of the rump. Their tails are long and black in color. A blackish stripe extends from the chin down the lower edge of the neck, through the juncture of the shoulder and leg along the lower flank of each side to the blackish section of the rear leg. They have muscular necks and shoulders, and their legs have white 'socks' with a black patch on the front of both the front legs, and both sexes have long, straight horns. Comparably, the East African oryx lacks a dark patch at the base of the tail, has less black on the legs (none on the hindlegs), and less black on the lower flanks. One very rare color morph is the "golden oryx", in which the gemsbok's black markings are muted and appear to be golden.

Gemsbok are the largest species in the genus Oryx. They stand about 1.2 m (4 ft) at the shoulder.[7][8] The body length can vary from 190 to 240 cm (75 to 94 in) and the tail measures 45 to 90 cm (18 to 35 in).[9] Male gemsbok can weigh between 180 and 240 kg (400 and 530 lb), while females weigh 100–210 kg (220–460 lb).

Horns

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Portrait in Etosha National Park, Namibia

Gemsbok are widely hunted for their spectacular horns that average 85 cm (33 in) in length. From a distance, the only outward difference between males and females is their horns, and many hunters mistake females for males each year. In males horns tend to be thicker with larger bases. Females have slightly longer, thinner horns.

Female gemsbok use their horns to defend themselves and their offspring from predators, while males primarily use their horns to defend their territories from other males.[10]

Gemsbok are one of the few antelope species where female trophies are sometimes more desirable than male ones. A gemsbok horn can be fashioned into a natural trumpet and, according to some authorities, can be used as a shofar.[11]

Distribution and habitat

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Gemsbok are found in arid and semi-arid bushlands in southwestern Africa, especially around the Namib and Kalahari deserts, in Botswana, Zimbabwe, Namibia, South Africa and formerly Angola (where they are considered extirpated).[1]

Drinking with a group of helmeted guineafowl in the foreground

A sizeable introduced population of several thousand is also present in the Chihuahuan Desert where they are problematic for the local ecosystem.

Ecology and biology

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Gemsbok live in herds of about 10–40 animals, which consist of a dominant male, a few nondominant males, and females. They are mainly desert-dwelling and do not depend on drinking water to supply their physiological needs. They can reach running speeds of up to 60 km/h (37 mph). Gemsbok are mostly crepuscular in nature, since temperatures are tolerable and predator detection rates are highest during these times.

Diet

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The gemsbok is generally a grazer but changes to browsing during the dry season or when grass is sparse. It may dig up to a meter deep to find roots and tubers, supplementing its water intake by eating wild tsamma melons and cucumbers, which can provide all the water required (3 liters per 100 kg bodyweight a day).[12]

Reproduction

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Three-day-old fawn
Oryx at Sesriem entrance in Namib Desert
Mother and calf at the Buffalo Zoo

The gemsbok is polygynous, with one resident male mating with the receptive females in the herd. The male is known to secure exclusive mating access to the females by attempting to herd mixed or nursery herds onto his territory. The gemsbok has no specified breeding season, but the young in a given herd tend to be of a similar age due to reproductive synchrony between females. Pregnant females leave the herd before giving birth. The gestation period lasts 270 days and mothers give birth to 1–2 offspring. The calf remains hidden 6 weeks after birth, after which mother and calf rejoin the herd. The calf is weaned at 3+1⁄2 months, becomes independent at 4+1⁄2 months, and achieves sexual maturity at 1+1⁄2–2 years in both sexes.[12]

Buck on the Jornada del Muerto trail north of Upham, New Mexico, USA

Introduction to North America

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In 1969, the New Mexico State Department of Game and Fish decided to introduce gemsbok to the Tularosa Basin, New Mexico, in the United States.[13] Ninety-three were released from 1969 to 1977, with the current population estimated to be around 3,000 individuals.[14] Gradually expanding their range from Tularosa Basin towards the west and northwest, an unknown number of animals are now also established in the San Andres National Wildlife Refuge, the Jornada Biosphere Reserve as well as the endorheic drainage basins east of Caballo Mountains, especially where these are traversed by the Jornada del Muerto trail north of Upham.

Potential invasive status

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The inherent biology of gemsbok makes them a potential invasive species in New Mexico. As they are capable of year-round breeding, the transplanted population thrives in the absence of their natural predators, such as the lion (Panthera leo), spotted hyena (Crocuta crocuta), cheetah (Acinonyx jubatus) and leopard (Panthera pardus). Except for calves, the oryx is too large to be preyed on by the coyote (Canis latrans) and most other major American desert carnivores, since the jaguar (Panthera onca) is mostly extirpated from the state, and the reintroduced Mexican wolf (Canis lupus baileyi) is too low in population numbers (and all known Mexican wolf populations are over 100 miles away). The species is therefore primarily managed by regulated hunting.[15][16] However, the only North American predator that regularly takes gemsbok is the cougar (Puma concolor); for only one individual, 29 gemsbok were hunted, with the species making up 58% of recorded kills (most consisting of newborns, but some adults were also known to have been killed).[17]

Additionally, New Mexico gemsbok seem to prefer undisturbed grasslands for feeding, putting pressure on grassland ecosystems already threatened by climate change and encroachment by shrubs.[18] This fact, along with their larger size and potentially dangerous horns, may cause them to outcompete with and/or put pressure on not only local livestock operations, but native desert herbivores, such as the pronghorn (Antilocapra americana) and the mule deer (Odocoileus hemionus). In addition, gemsbok may spread disease to fellow bovids like the desert bighorn sheep (Ovis canadensis nelsoni).[17]

Significance to humans

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The gemsbok is depicted on the coat of arms of Namibia,[19] where the current population of the species is estimated at 373,000 individuals.[1] In the town of Oranjemund, resident gemsbok wander freely around the streets, taking advantage of the vegetation in the town, such as the grass in parks, road medians, and browsing on low branches of the many trees.

References

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  1. ^ a b c IUCN SSC Antelope Specialist Group (2020). "Oryx gazella". IUCN Red List of Threatened Species. 2020: e.T15573A166485425. doi:10.2305/IUCN.UK.2020-1.RLTS.T15573A166485425.en. Retrieved 12 November 2021.
  2. ^ "NatureServe Explorer 2.0".
  3. ^ IUCN (International Union for Conservation of Nature) 2008. Oryx gazella. In: IUCN 2015. The IUCN Red List of Threatened Species. Version 2015.2. "The IUCN Red List of Threatened Species". Archived from the original on 2014-06-27. Retrieved 2014-06-27.. Downloaded on 14 July 2015.
  4. ^ "Gemsbok, n." Dictionary of South African English. Dictionary Unit for South African English, 2018. 25 February 2019.
  5. ^ "Zoekresultaten". etymologiebank.nl. Retrieved 2021-06-04.
  6. ^ Dictionary.com: "Gemsbok". Dictionary.reference.com. Retrieved on 2013-10-10.
  7. ^ Oryx Gemsbok. Zoo la Boissière-du-Doré
  8. ^ Oryx gemsbok – Fiche détaillée – Les mammifères. Tous vos animaux. Retrieved on 2013-10-10.
  9. ^ Gemsbok videos, photos and facts – Oryx gazella Archived 2012-08-21 at the Wayback Machine. ARKive. Retrieved on 2013-10-10.
  10. ^ Matign System. bio.davidson.edu
  11. ^ Hearing Shofar: Making a Gemsbok Shofar. Hearingshofar.blogspot.com (2010-01-01). Retrieved on 2013-10-10.
  12. ^ a b Sanders, S. "Oryx gazella". University of Michigan Museum of Zoology. Animal Diversity Web.
  13. ^ CHAPTER SIX: A BRAVE NEW WORLD: WHITE SANDS AND THE CLOSE OF THE 20th CENTURY, 1970–1994. US National Park Service. Retrieved on 2013-10-10.
  14. ^ Bender, Louis; Morrow, Patrick; Weisenberger, Mara; Krueger, Bryce (2019). "Population Dynamics and Control of Exotic South African Oryx in the Chihuahuan Desert, South-central New Mexico". Human–Wildlife Interactions. 13 (1): 158–166. doi:10.26076/dbdm-9c32.
  15. ^ Exotic Animal Management (African Oryx). US National Park Service. Retrieved on 2013-10-10.
  16. ^ "San Andres NWR Oryx Population Reduction webpage". Archived from the original on 2021-01-12. Retrieved 2021-01-10.
  17. ^ a b Kobilinsky, Dana (9 March 2023). "Rising oryx numbers may distress New Mexico ecosystem". The Wildlife Society. Retrieved 12 March 2023.
  18. ^ Andreoni, Kieran J.; Wagnon, Casey J.; Bestelmeyer, Brandon T.; Schooley, Robert L. (2021-01-01). "Exotic oryx interact with shrub encroachment in the Chihuahuan Desert". Journal of Arid Environments. 184: 104302. doi:10.1016/j.jaridenv.2020.104302. ISSN 0140-1963.
  19. ^ "National Symbols". gov.na. Government of Namibia. Retrieved 2015-05-09.
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