Kob

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Kob
Male Ugandan kob - Queen Elizabeth National Park, Uganda (4).jpg
Male
At the Queen Elizabeth National Park
Ugandan kobs (Kobus kob thomasi) female and calf.jpg
Female and calf
At the Semliki Wildlife Reserve
both K. k. thomasi in Uganda
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Artiodactyla
Family: Bovidae
Genus: Kobus
Species:
K. kob
Binomial name
Kobus kob
(Erxleben, 1777)
Subspecies
Kobus kob distribution.svg
Geographic range

The kob (Kobus kob) is an antelope found across Central Africa and parts of West Africa and East Africa. Together with the closely related reedbucks, waterbucks, lechwe, Nile lechwe, and puku, it forms the Reduncinae tribe. [2] Found along the northern savanna, it is often seen in Murchison Falls and Queen Elizabeth National Park, Uganda; Garamba and Virunga National Park, and the Democratic Republic of the Congo, as well as grassy floodplains of South Sudan. [3] Kob are found in wet areas (such as floodplains), where they eat grasses. Kob are diurnal, but inactive during the heat of the day. They live in groups of either females and calves or just males. These groups generally range from five to 40 animals.

Contents

Among the kobs of eastern Africa, the Ugandan kob (Kobus kob thomasi) appears on the coat of arms of Uganda, [4] and white-eared kobs (Kobus kob leucotis), found in South Sudan, southwest Ethiopia, and extreme northeast Uganda, participate in large-scale migrations.

Description

Uganda kob at Murchison Falls NP UgandaKob.jpg
Uganda kob at Murchison Falls NP

The kob resembles the impala but is more heavily built. [5] However, males are more robust than females and have horns. [6] Males have shoulder heights of 90–100 cm (3.0–3.3 ft) and an average weight of 94 kg (207 lb). Females have shoulder heights of 82–92 cm (2.69–3.02 ft) and weigh on average 63 kg (139 lb). [5] [6] The pelage of the kob is typically golden to reddish-brown overall, but with the throat patch, eye ring, and inner ear being white, and the forelegs being black at the front. [5] Males get darker as they get older. Those of the white-eared kob (K. k. leucotis), which is found in the Sudd region (the easternmost part of their range), are strikingly different and overall dark, rather similar to the male Nile lechwe, though with a white throat and no pale patch from the nape to the shoulder. Both sexes have well-developed inguinal glands that secrete a yellow, waxy substance, as well as preorbital glands. [7]

Range

The kob is currently found in Benin, Burkina Faso, Cameroon, Central African Republic, Chad, Ivory Coast, Democratic Republic of the Congo, Ethiopia, Ghana, Guinea, Guinea Bissau, Mali, Mauritania, Niger, Nigeria, Senegal, South Sudan, Togo, and Uganda. It was formerly also found in Gambia, Kenya, Sierra Leone, Morocco and Tanzania, but is now extinct in those areas. [8]

Ecology

The kob's distribution from western Africa to central East Africa is patchy. [1] It inhabits flat areas and open country close to permanent water, with consistent climate. It drinks daily and requires fresh grazing. [6] During the rains, kob frequent short grasses and keep them short. [9] Since it is dependent on water, the kob does not wander far into arid areas. [6] Kob gather on and move from one pasture to another, coinciding with seasonal changes. [6] In flooded areas, they may travel hundreds of kilometers, and dry-season walks to water may take 10 km or more. [6] Grasses preferred by kobs are Hyparrhenia species, Brachiaria brizantha , Setaria gayanus, Chloris gayana , and Echinochloa and Digitaria spp. [10]

Social behavior and life history

Female Kob can live in herds numbering in the thousands. They move more and are more social than territorial males. [6] Females are at the front of the daily movements to water. Individuals learn where to go from their mothers. However, in larger herds, the females take their signals from other females. [6] Males are also present in the migratory herds and follow the females. All-male herds may number in the hundreds and accompany females as they travel during dry season. [6]

Gathering of kobs at Murchison Falls National Park Ugandan Kobs.JPG
Gathering of kobs at Murchison Falls National Park

The social and reproductive organization of kob can vary. When in average or low population densities, males establish conventional territories and do not travel much. Adult males try to establish their territories in the best habitat available, which are inhabited by herds of females and their young. Herds are fluid and change in size and structure as individuals travel to find green vegetation. Other males, particularly young males, live in bachelor herds and are segregated from the females by the territorial males. On floodplains, where kob are densely populated, around two-thirds of the territorial males establish traditional territories, while the rest live in clustered territories known as leks. [9] These clusters are sometimes smaller than a single traditional territory. Lek clusters are located on patches of short grass or bare ground within comparably tall grassland. As such, these territories have little to no value other than to the males that reside in them. About eight or 9 of every 10 females visit leks to mate, trading spacing and food for mating success. [11] The kob tends to live in smaller herds consisting of 5 to 15 individual kob, but herds as many as 40+ have been observed. [12] Females and bachelor males live in large herds of up to 2000 and move through the leks, which are surrounded by high-quality grass and are near waterholes and commonly travelled routes.

Kob at Cote d'Ivoire Antilope-boundiali.jpg
Kob at Côte d'Ivoire

Conflicts between territorial Ugandan kob (K. k. thomasi) are usually settled with ritual and rarely actual fighting, whether in conventional territories or leks. A male usually needs only to walk in an erect posture towards the intruder to displace him. [13] Neighboring males in leks do the same thing when they encounter their borders. Lek-holding white-eared kobs fight more often. [14] Ugandan kob do sometimes sustain serious or fatal injuries, especially when control of a territory is at stake. Fights usually involve the combatants clashing, pressing and twisting each other with their horns head-on. However, a neighbor may attack from the rear or side. [13] [14] In lek clusters, the most dominant males occupy the center. The number of males in the center of a lek cluster ranges from three to seven, and their leks are the most clustered and they monopolize copulations with estrous females. [15] Replacement of males in leks are much more common than in traditional territories, and most males are able to stay in the centre positions for only a day or two and rarely up to a week. This is largely due to intense competition and because most males leave their territories to feed and drink. Centrally located males reduce their chances of being replaced by leaving to feed during periods of relative calmness, yet they are not able to get enough food and water and have to eventually leave their leks. However, a male can gain enough energy after a week or two, and try to take back his position. At every lek cluster, males are always waiting take or retake a central lek. [13] Males in traditional territories are able to stay for at least a year or two. [9]

Females have their first ovulation at 13–14 months of age and have 20- to 26-day intervals between estrous cycles until they are fertilized. Males from traditional territories and leks have different courtship strategies. Males of traditional territories will herd females and keep them in their territories. [16] Lek males try to do the same, but usually fail. They have to rely on advertising themselves. Kob courtship may last as short as two minutes, and copulation may only last a few seconds. [13] At leks, a female may mate up to 20 times with at least one of the central males in a day. After an eight-month gestation period and giving birth, estrus may commence 21–64 days later. For their first month, calves hide in dense vegetation. Mother and calf can identify each other by their noses. As they get older, calves gather into crèches. When they are three to four months old, the young enter the females' herds and stay with mothers until six to seven months, by which time they are weaned. When they mature, males join bachelors groups. [17]

Status

The white-eared kob (K. k. leucotis) is a dark subspecies from the Sudd and nearby regions The book of antelopes (1894) Cobus leucotis.png
The white-eared kob (K. k. leucotis) is a dark subspecies from the Sudd and nearby regions

Kob populations have been reduced by hunting and human development. [18] The Uganda kob (Kobus kob thomasi) became extinct in southwestern Kenya and northwestern Tanzania due to the expansion of human settlements and agriculture. However, there are sizeable populations of this subspecies in Murchison Falls and Queen Elizabeth National Park in Uganda and Garamba and Virunga National Park in the Democratic Republic of the Congo. [1]

Buffon's kob (Kobus kob kob) is protected in several parks, including Niokolo-Koba in Senegal, Comoé in Côte d'Ivoire, Arly-Singou in Burkina Faso, Mole and Bui in Ghana, Pendjari in Benin, Waza, Bénoué and Faro National Parks of the North Province of Cameroon, Zakouma in Chad, and Manovo-Gounda-St. Floris and Dzanga Sangha Forest Reserve in the Central African Republic. [1]

Once feared almost extinct because of the Second Sudanese Civil War (1983–2005), surveys in 2007 and later confirmed that several hundred thousand white-eared kobs (Kobus kob leucotis) survived. Together with tiang and Mongalla gazelles, they participate in one of the largest mammal migrations on Earth, numbering about 1.2 million individuals in total. [19] The white-eared kob is protected in Boma National Park and Bandingilo National Park in South Sudan, [1] and Gambella National Park in Ethiopia. [20]

See also

Related Research Articles

<span class="mw-page-title-main">Antelope</span> Term referring to an even-toed ruminant

The term antelope refers to numerous extant or recently extinct species of the ruminant artiodactyl family Bovidae that are indigenous to most of Africa, India, the Middle East, Central Asia, and a small area of Eastern Europe. Antelopes do not form a monophyletic group, as some antelopes are more closely related to other bovid groups, like bovines, goats, and sheep, than to other antelopes.

<span class="mw-page-title-main">Sitatunga</span> Species of swamp-dwelling antelope

The sitatunga or marshbuck is a swamp-dwelling medium-sized antelope found throughout central Africa, centering on the Democratic Republic of the Congo, the Republic of the Congo, Cameroon, parts of Southern Sudan, Equatorial Guinea, Burundi, Ghana, Botswana, Rwanda, Zambia, Gabon, the Central African Republic, Tanzania, Uganda and Kenya. The sitatunga is mostly confined to swampy and marshy habitats. Here they occur in tall and dense vegetation as well as seasonal swamps, marshy clearings in forests, riparian thickets and mangrove swamps.

<span class="mw-page-title-main">Greater kudu</span> Species of woodland antelope

The greater kudu is a large woodland antelope, found throughout eastern and southern Africa. Despite occupying such widespread territory, they are sparsely populated in most areas due to declining habitat, deforestation, and poaching. The greater kudu is one of two species commonly known as kudu, the other being the lesser kudu, T. imberbis.

<span class="mw-page-title-main">Common eland</span> Second largest antelope in the world

The common eland, also known as the southern eland or eland antelope, is a large-sized savannah and plains antelope found in East and Southern Africa. It is a species of the family Bovidae and genus Taurotragus. An adult male is around 1.6 m (5.2 ft) tall at the shoulder and can weigh up to 942 kg (2,077 lb) with a typical range of 500–600 kg (1,100–1,300 lb), 340–445 kg (750–981 lb) for females). It is the second-largest antelope in the world, being slightly smaller on average than the giant eland. It was scientifically described by Peter Simon Pallas in 1766.

<span class="mw-page-title-main">Reduncinae</span> Subfamily of mammals

The bovid subfamily Reduncinae or tribe Reduncini is composed of nine species of antelope, all of which dwell in marshes, floodplains, or other well-watered areas, including the waterbucks and reedbucks. These antelopes first appear in the fossil record 7.4 million years ago in Eurasia and 6.6 Mya in Africa.

<span class="mw-page-title-main">Hirola</span> Species of antelope

The hirola, also called the Hunter's hartebeest or Hunter's antelope, is a critically endangered antelope species found as of now, only in Kenya along the border of Somalia. It was first described by the big game hunter and zoologist H.C.V. Hunter in 1888. It is the only living member of the genus Beatragus, though other species are known from the fossil record. The global hirola population is estimated at 300–500 animals and there are none in captivity. According to a document produced by the International Union for Conservation of Nature "the loss of the hirola would be the first extinction of a mammalian genus on mainland Africa in modern human history".

<span class="mw-page-title-main">Common tsessebe</span> Subspecies of the subfamily Alcelaphinae in the family Bovidae

The common tsessebe or sassaby is the southern, nominate subspecies of Damaliscus lunatus, although some authorities have recognised it as an independent species. It is most closely related to the Bangweulu tsessebe, sometimes also seen as a separate species, less to the topi, korrigum, coastal topi and tiang subspecies of D. lunatus, and less to the bontebok in the same genus. Common tsessebe are found in Angola, Zambia, Namibia, Botswana, Zimbabwe, Eswatini, and South Africa.

<span class="mw-page-title-main">Lechwe</span> Species of mammal

The lechwe, red lechwe, or southern lechwe is an antelope found in wetlands of south-central Africa.

<span class="mw-page-title-main">Nile lechwe</span> Species of antelope

The Nile lechwe or Mrs Gray's lechwe is an endangered species of antelope found in swamps and grasslands in South Sudan and Ethiopia.

<span class="mw-page-title-main">Waterbuck</span> Species of antelope

The waterbuck is a large antelope found widely in sub-Saharan Africa. It is placed in the genus Kobus of the family Bovidae. It was first described by Irish naturalist William Ogilby in 1833. Its 13 subspecies are grouped under two varieties: the common or ellipsiprymnus waterbuck and the defassa waterbuck. The head-and-body length is typically between 177 and 235 cm and the typical height is between 120 and 136 cm. In this sexually dimorphic antelope, males are taller and heavier than females. Males reach roughly 127 cm (50 in) at the shoulder, while females reach 119 cm (47 in). Males typically weigh 198–262 kg (437–578 lb) and females 161–214 kg (355–472 lb). Their coat colour varies from brown to grey. The long, spiral horns, present only on males, curve backward, then forward, and are 55–99 cm (22–39 in) long.

<span class="mw-page-title-main">Puku</span> Species of antelope

The puku is a medium-sized antelope found in wet grasslands in southern Democratic Republic of Congo, Namibia, Tanzania, Zambia and more concentrated in the Okavango Delta in Botswana. Nearly one-third of all puku are found in protected areas, zoos, and national parks due to their diminishing habitat.

<span class="mw-page-title-main">Bohor reedbuck</span> Species of mammal

The bohor reedbuck is an antelope native to central Africa. The animal is placed under the genus Redunca and in the family Bovidae. It was first described by German zoologist and botanist Peter Simon Pallas in 1767. The bohor reedbuck has five subspecies. The head-and-body length of this medium-sized antelope is typically between 100–135 cm (39–53 in). Males reach approximately 75–89 cm (30–35 in) at the shoulder, while females reach 69–76 cm (27–30 in). Males typically weigh 43–65 kg (95–143 lb) and females 35–45 kg (77–99 lb). This sturdily built antelope has a yellow to grayish brown coat. Only the males possess horns which measure about 25–35 cm (9.8–13.8 in) long.

Gambella National Park, also spelled Gambela National Park, is a 5,016 km2 (1,937 sq mi) large national park in Ethiopia. It is the nation's largest national park and is located several hundred kilometers from Addis Ababa. It was established in 1974, but is not fully protected and has not been effectively managed for much of its history.

<span class="mw-page-title-main">Blue wildebeest</span> Species of antelope

The blue wildebeest, also called the common wildebeest, white-bearded gnu or brindled gnu, is a large antelope and one of the two species of wildebeest. It is placed in the genus Connochaetes and family Bovidae, and has a close taxonomic relationship with the black wildebeest. The blue wildebeest is known to have five subspecies. This broad-shouldered antelope has a muscular, front-heavy appearance, with a distinctive, robust muzzle. Young blue wildebeest are born tawny brown, and begin to take on their adult coloration at the age of 2 months. The adults' hues range from a deep slate or bluish-gray to light gray or even grayish-brown. Both sexes possess a pair of large curved horns.

<span class="mw-page-title-main">Ugandan kob</span> Subspecies of mammal

The Ugandan kob is a subspecies of the kob, a type of antelope. It is found in sub-Saharan Africa in South Sudan, Uganda and the Democratic Republic of the Congo. The Ugandan kob is normally reddish-brown, differentiating it from other kob subspecies.

<i>Damaliscus lunatus</i> Species of the subfamily Alcelaphinae in the family Bovidae

Damaliscus lunatus is a large African antelope of the genus Damaliscus and subfamily Alcelaphinae in the family Bovidae, with a number of recognised geographic subspecies. Some authorities have split the different populations of the species into different species, although this is seen as controversial. Common names include topi, sassaby, tiang and tsessebe.

<span class="mw-page-title-main">Grant's gazelle</span> Species of mammal

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<span class="mw-page-title-main">Mongalla gazelle</span> Species of mammal

The Mongalla gazelle is a species of gazelle found in the floodplain and savanna of South Sudan. It was first described by British zoologist Walter Rothschild in 1903. The taxonomic status of the Mongalla gazelle is widely disputed. While some authorities consider it a full-fledged monotypic species in the genus Eudorcas, it is often considered a subspecies of Thomson's gazelle, while other authorities regard it as subspecies of the red-fronted gazelle.

Boma National Park is a protected area in eastern South Sudan near the Ethiopian border. It was established in 1977 and covers 22,800 km2 (8,800 sq mi) of grasslands and floodplains.

The Cape lechwe or Venter's lechwe is an extinct species similar to the red lechwe, Kobus leche. It was described by Robert Broom from a frontlet and horn core from Haagenstad, which Broom believed to be an intermediate form between lechwe and waterbuck. However others have failed to find justification for separating the species from Kobus leche.

References

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  2. Estes 1991, p. 91.
  3. "Kob Antelope: Kobus Kob". ThinkQuest library. Archived from the original on 2007-08-07. Retrieved 2007-06-16.
  4. "The Coat of Arms", High Commission of Uganda in Pretoria, retrieved 17 December 2018
  5. 1 2 3 Estes 1991, p. 98.
  6. 1 2 3 4 5 6 7 8 9 Kingdon, J. (1982). East African Mammals: An Atlas of Evolution in Africa, Volume 3, Part. C: Bovids. University Chicago Press, Chicago 367-381.
  7. Estes 1991, p. 98–99.
  8. Don E. Wilson; DeeAnn M. Reeder (2005). Mammal Species of the World: A Taxonomic and Geographic Reference, Volume 1. JHU Press. p. 720. ISBN   9780801882210.
  9. 1 2 3 Estes 1991, p. 99.
  10. Bindernagel, J. A. (1968) Game cropping in Uganda. Canadian International Development Agency, Ottawa.
  11. Estes 1991, p. 100.
  12. "Wild Fact #292 – Better Than Corn On The Cob – Kob". 2012-05-24.
  13. 1 2 3 4 Buechner, H. K., Schleoth, R. K., (1965) Ceremonial mating behavior in Uganda kob (Adenota kob thomsi Neuman). Z. Tierpsychol, 22:209-25.
  14. 1 2 Fryxell, J. (1985) Resource limitation and population ecology of white-eared kob. Ph.D. thesis, Univ. of British Columbia.
  15. Floody, O. R., Arnold , A. P., (1975) Uganda kob (Adenota kob thomasi). Territoriality and the spatial distribution of sexual and agonistic behavior at a territorial ground. Z. Tierpsychol, 37:192-212.
  16. Estes 1991, p. 101.
  17. Estes 1991, p. 102.
  18. Fischer, Frauke; Linsenmair, K. Eduard (6 December 2006). Changing social organization in an ungulate population subject to poaching and predation – the kob antelope (Kobus kob kob) in the Comoé National Park, Côte d'Ivoire. African Journal of Ecology. pp. 285–292.
  19. "White-Eared Kob". National Geographic. 2010-11-09. Archived from the original on March 11, 2017. Retrieved 27 November 2018.
  20. Briggs, Philip; Blatt, Brian (2009). Ethiopia. Bradt Travel Guides. p. 581.

Bibliography