Overview

Brief Summary

Biology

The bohor reedbuck is exclusively a grazer (2), that feeds on fresh green grasses and tender reed shoots (4). It generally feeds during the night when it may wander up to 8 km from its daytime shelter (2). However, during the dry season, when the quality of the grass and reeds deteriorates, feeding at night alone allows insufficient time for the reedbuck to fulfil its energetic and nutritional requirements, and thus it may continue to graze throughout the day also (2). Like other small antelope, the bohor reedbuck hides from predators rather than forming herds in defence (5). Whilst the grass and reeds of its habitat provide important shelter from predators, it can be difficult to communicate with each other in such dense surroundings, and thus the bohor has adopted leaping and whistling as effective forms of communication (2). Choruses of variable whistles are frequently herd throughout the night, and leaps, which differ in height, length and style, are a characteristic behaviour of the bohor reedbuck (2). During the wet season when food is plentiful, females and their offspring occur separately, with up to five females living within the breeding territory of a male reedbuck (3). Although, due to the changeable nature of their habitat, this is more a case of the rams defending access to the ewes, rather than defending an area, whilst the ewes seek out the best and safest pastures (2). During the dry season, these small groups merge into herds of up to ten animals (6). Courtship in the bohor reedbuck begins with the male circling the female, and making a peculiar bleating noise, described as the sound of a toy trumpet (2). Pregnancy lasts for seven months, after which a single calf is born which remains well hidden for the first two months of life (2). Male calves are driven away from the herd after six months, and form bachelor herds until they become fully mature at the age of four years. Females however, are able to breed at just one year of age (2)
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Comprehensive Description

Description

This medium-sized, sandy coloured antelope possesses no outstanding physical features (3), instead, its loud whistles and bounding behaviour are more distinctive attributes that signify its presence in the tall grasslands it inhabits (2). The bohor reedbuck has a yellowish to pale reddish-brown coat, with a greasy appearance due to the sebaceous glands at the roots of the hairs (2), and white underparts (3). It has a short, busy tail (3), and a conspicuous grey patch under each ear where scent glands are situated (4). Only the male, or ram, possesses short, stout, ringed horns that are hooked forwards (3).
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Distribution

Range Description

The Bohor Reedbuck ranges north of the forest zone from Senegal, The Gambia, and southwest Mauritania through the woodlands and floodplain grasslands of the savanna zone of West Africa through southern Chad, the savanna woodlands of the Central African Republic, extreme northeast DR Congo, southern Sudan, to Ethiopia and south to Lake Tanganyika and the Rovuma River in Tanzania (East 1999; Kingdon and Hoffmann in press). In West Africa, in particular, they have undergone fairly large range contractions, and may now be extinct in Togo and Côte d’Ivoire (Kingdon and Hoffmann in press).
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Geographic Range

The bohor reedbuck is found in the floodplain and drainage-line grasslands of the northern and southern Savanna on the continent of Africa (Estes, 1991).

Biogeographic Regions: ethiopian (Native )

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Range

Occurs from Senegal, east to Ethiopia and south to Tanzania (2).
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Physical Description

Morphology

Physical Description

The bohor reedbuck is a medium sized antelope. Males range in height between 75 - 89 cm whereas females range in height from 69 - 76 cm. The males are not only larger than the females but their markings are more defined as well. The color of reedbucks ranges from yellow to a grayish brown, but in general, bohor reedbucks are yellower than the other reedbuck species. Bohor reedbucks have a round bare spot beneath each ear along with white underparts and white markings under their tails. Young bohors have darker and longer hair than the adults. Just male bohor reedbucks have horns, which vary in size from 20 -41 cm and slightly hook forward (Estes, 1991).

Range mass: 36 to 55 kg.

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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
Bohor Reedbuck are associated with woodland and floodplain grassland across much of their range. They are effectively water-dependent grazers, but show a strong preference for extensive areas of flood plains and open inundated grasslands where access to water may become restricted in the dry season (Kingdon and Hoffmann in press). On the extreme north-eastern margins of its range, this species has colonized montane areas, such as the Bale Mtns up to about 3,200 m, beyond its usual preferred habitats (Yalden et al. 1996). In some marginal parts of its range, such as the Aberdares in Kenya and the Ethiopian Highlands, this species co-exists with the Mountain Reedbuck Redunca fulvorufula, while over much of Tanzania its range overlaps with that of the Southern Reedbuck Redunca arundinum.

Systems
  • Terrestrial
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Habitat

The habitats of the bohor reedbuck are grasslands and wide wideplains that have tall grass in which they can hide. They are rarely found on steep slopes or tall grassland because of the poor vegetation.

Terrestrial Biomes: savanna or grassland ; forest ; scrub forest

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Habitat

The bohor reedbuck inhabits moist grasslands and swamplands (5). It often occurs in unstable grasslands that are susceptible to flooding, drought and fires, but is well adapted to these extremes (2).
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Trophic Strategy

Food Habits

The bohor reedbuck is a grazing animal and prefers grasses with high protein and low fiber. During the dry season they eat other types of vegetation if their normal diet is not available. The bohor reedbuck is a water dependent animal but may not need water if they are in green pastures (Estes, 1991). In farming communities, bohor reedbucks have been spotted grazing on wheat and other grains (Kingdon, 1989).

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Life History and Behavior

Life Expectancy

Lifespan/Longevity

Average lifespan

Status: captivity:
18.0 years.

Average lifespan

Status: captivity:
10.0 years.

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Lifespan, longevity, and ageing

Observations: Anecdotal reports suggesting that these animals live up to 18 years have not been verified upon close scrutiny. Record longevity in captivity is 10.7 years (Richard Weigl 2005). Further studies are necessary.
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Reproduction

Reproduction

Although there is not a set breeding season for the bohor reedbuck, there is a breeding peak around the rainy season. The gestation period is seven and a half months and usually only one calf is born per breeding season. Young calves are hiders, and they remain in seclusions for up to eight weeks. After this period, the young calves begin to form age groups with those of similar age. A close bond between the young and the mother lasts for about eight to nine months. Males are mature at three years of age while the females mature at two years, and in some cases in even just a year, and can conceive every nine to fourteen months (Estes, 1991).

Range number of offspring: 1 (low) .

Average number of offspring: 1.

Average gestation period: 7.5 months.

Average gestation period: 228 days.

Average number of offspring: 1.

Average age at sexual or reproductive maturity (male)

Sex: male:
502 days.

Average age at sexual or reproductive maturity (female)

Sex: female:
502 days.

Parental Investment: altricial

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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
LC
Least Concern

Red List Criteria

Version
3.1

Year Assessed
2008

Assessor/s
IUCN SSC Antelope Specialist Group

Reviewer/s
Mallon, D.P. (Antelope Red List Authority) & Hoffmann, M. (Global Mammal Assessment)

Justification
Listed as Least Concern as total numbers have been estimated at ca. 101,000. Although populations are gradually declining except in some East African parks, the overall rate is not believed to be sufficient to meet the criteria for threatened status, but it may be heading towards a point where Near Threatened becomes appropriate.

History
  • 1996
    Lower Risk/conservation dependent
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Conservation Status

US Federal List: no special status

CITES: no special status

IUCN Red List of Threatened Species: least concern

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Status

Classified as Lower Risk / Conservation Dependent (LR/cd) by the IUCN Red List 2007 (1).
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Population

Population
East (1999) estimated the total population size at 101,000, including 4,500 in Sudan, which is probably a substantial underestimate; the species may well survive in good numbers in southern Sudan. Its numbers are in gradual decline over most of its remaining range, apart from some protected areas in East Africa.

Aerial survey estimates are available for populations of this species in many parts of its range, particularly in Central and East Africa. Citing various authors, East (1999) indicates that these surveys have generally given density estimates of 0.1-0.3/km². Aerial counts undoubtedly tend to underestimate reedbuck numbers, by an unknown but probably substantial amount. In the Sahelo-Sudanian habitat of Waza N.P. (north Cameroon), of which approximately 40% is floodplain, numbers were estimated, mostly through terrestrial counts, at 4,000 in 1960, dropping to 500 in 1967 and to less than 100 following the 1970s droughts (respectively, 2.4 to 0.3 to 0.06/km² (Scholte 2005, Scholte et al. 2007).

Population Trend
Decreasing
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Threats

Threats

Major Threats
Bohor Reedbuck have been eliminated from large parts of their natural range by overhunting and loss of habitat to the expansion of settlement and livestock, although it tends to survive for longer in over-exploited areas than less secretive and more easily hunted species. In many countries it only survives in viable but greatly depleted numbers in protected areas. Drought has also been cited as a major threat.

In North Cameroon, floodplain degradation through the construction of upstream dams has been a major reason for the decline of Reedbuck; nonetheless, reedbuck can still be observed even in floodplain areas with (relatively) high population pressure (P. Scholte, in Hoffmann and Kingdon in press).
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Threats

The bohor reedbuck is a common and widely distributed species (2). However, it still faces the threat of habitat loss and degradation due to the encroachment of human settlements into their habitat (1), particularly in West Africa, where reedbuck populations have become fragmented (3). The hunting of this species for food also poses a potential threat (1).
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Management

Conservation Actions

Conservation Actions
The Bohor Reedbuck is now generally uncommon/rare where it survives in West Africa, but viable populations persist in areas such as Boucle du Baoule (Mali), Niokolo-Koba (Senegal), Corubal River (Guinea-Bissau) and Arty-Singou and Nazinga (Burkina Faso). It is more numerous in Central and East Africa, with major populations in areas such as Bouba Ndjida (Cameroon), Manovo-Gounda-St. Floris (Central African Republic), Bale Mountains (Ethiopia), Murchison Falls and Pian-Upe (Uganda), Mara (Kenya) and Serengeti, Moyowosi-Kigosi and Selous (Tanzania). Some of these key populations are decreasing because of poaching, especially in West and Central Africa. About three-quarters of the estimated total occurs in protected areas (East 1999).

If current trends persist, the Bohor Reedbuck should continue to survive in reasonable numbers in national parks, equivalent reserves and hunting concessions in East Africa, but it will become increasingly uncommon in West and Central Africa until its survival in these regions is eventually threatened. More active protection and management of areas which retain viable populations will be necessary to reverse this trend.
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Conservation

Despite the threats of habitat loss and degradation that the bohor reedbuck faces, it has proved itself capable of surviving in the face of agricultural expansion (2).
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Relevance to Humans and Ecosystems

Benefits

Economic Importance for Humans: Negative

Bohor reedbucks have been found grazing on farmers' crops, especially wheat and other grains (Kingdon, 1989).

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Economic Importance for Humans: Positive

Bohor reedbucks have been a game animal in Africa in the past. During the dry season, bohors are hunted with dogs and nets in Uganda. Bohors with the largest horns are prized by hunters (Kingdon, 1989)

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Wikipedia

Bohor Reedbuck

The Bohor reedbuck (Redunca redunca) is an antelope native to central Africa in the genus Redunca, that mostly lives in grasslands near water.

Contents

Description

The yellow to grayish brown coat of Bohor reedbucks feels rough and oily. The undersides are white in color. A few markings—like a dark stripe on the front of each foreleg, a pale ring of hair around the eyes and along the lips, lower jaw, and upper throat—can be found.[2] Males have thick necks and a pair of horns, that are short and stout, extending backward from the forehead before hooking sharply inwards and forwards at the tips. The horns measure about 25–35 cm. Some Sudanese reedbucks have very long, wide-spreading horns, too. Females lack horns. Males weigh 43–65 kg, while females weigh 35–45 kg. A bohor reddbuck can survive for almost ten years.[2]

Taxonomy

It was first described by Peter Simon Pallas, a German zoologist and botanist who worked in Russia, in 1767. As many as seven subspecies have been recognized, which Kingdon and Hoffmann had reduced to five.[1]

Ecology

Bohor reedbucks are active almost all the time, but often rest in grasslands during midday. Many predators, including lion, leopard, spotted hyena, African wild dog and Nile crocodile feed on these reedbucks. Bohor reedbucks can easily hide in grasses and reeds as the colors of their coats match with that of the ground.[3] When threatened, they usually remain motionless or retreat slowly into cover for defense, but if the threat is close they flee, whistling shrilly to alert the others. It hides from predators rather than forming herds in defence.[4] Adult males maintain territories about 0·2–0·3 km2 in area, and defend them by patrolling instead of marking them.

Most of these antelopes remain solitary. Two to seven adult females and one mature male occupy a shared home range but can not stay together for too long. In Sudan many large groups have over hundred members in summer. Male calves are driven away from the herd after six months, and form bachelor herds until they become fully mature at the age of four years. These often form their own groups.[4]

Feeding

Bohor reedbucks typically feed on grass. A specimen from Serengeti, Tanzania.

The bohor reedbuck is a herbivore and prefers grasses tender reed shoots with high protein and low fiber. It generally feeds in night. If the season is wet, food is abundant.[4] During summer they feed on other types of vegetation, like wheat and other grains, if their normal diet is not available. According to Richard Despard Estes, a biologist specializing in the behaviour of mammals in mainland Africa, they may not need water if they are in green pastures, even though they require it much.[3][5]

Reproduction

A male reaches sexual maturity at the age of three to four years, while females start their reproductive cycle at just one year of age. Courtship begins with the male circling the female, making a peculiar bleating noise. Like many other animals, bohor reedbucks also fight over dominance. The gestation period lasts for 7–8 months. A female can reproduce one offspring per birth, which remains well hidden for the first two months of life. Fewer births occur during the dry season,[4][2] but breeding is peak during rainy season. The estrus cycle repeats every 9–14 months.[5]

Habitat and distribution

Bohor reedbuck occurs from Senegal, east to Ethiopia and south to Tanzania. The bohor reedbuck inhabits moist and unstable grasslands and swamplands. It often can adapt well to flooding, drought and fires.[4] Typically found in floodplain and woodland habitats, it has a preference for coastal areas with a lot of tall grass.[2] According to the IUCN, it is mostly found in Benin, Burkina Faso, Burundi, Cameroon, Central African Republic, Chad, Republic of the Congo, Democratic Republic of the Congo, Ethiopia, Gambia, Ghana, Guinea, Guinea-Bissau, Kenya, Mali, Mauritania, Niger, Nigeria, Rwanda, Senegal, Sudan, Tanzania, and Togo (and perhaps in Eritrea).[1]

Conservation and threats

Though Bohor reedbuck is a common and widely distributed species and has least concern, it still faces the threat of habitat loss and degradation due to too many human settlements into its habitat (particularly in west Africa where reedbuck is scarce) and poaching. It is possibly extinct in Côte d'Ivoire and Uganda by now.[1] Bohor reedbucks have been a game animal in Africa in the past. During the dry season, bohors are hunted with dogs and nets in Uganda. Bohors with the largest horns are prized by hunters. This also decreased the population.[5] Accrding to the IUCN, major threats for the extinction of Bohor reedbuck include droughts, floodplain degradation, overhunting, and loss of habitat.[1]

References

  1. ^ a b c d e IUCN SSC Antelope Specialist Group (2008). Redunca redunca. In: IUCN 2008. IUCN Red List of Threatened Species. Downloaded on 18 January 2009. Database entry includes a brief justification of why this species is of least concern
  2. ^ a b c d Huffman, Brent. "Redunca redunca (Bohor reedbuck)" (in English). http://www.ultimateungulate.com/Artiodactyla/Redunca_redunca.html. 
  3. ^ a b Kingdon, Jonathan (1988) (in English) (PDF). East African Mammals: An Atlas of Evolution in Africa, Volume 3, Part C. Chicago: The University of Chicago Press. p. 351. ISBN 0-226-43718-3. http://books.google.co.in/books?id=FCCyI0JHrPEC&printsec=frontcover&source=gbs_ge_summary_r&cad=0#v=onepage&q&f=false. 
  4. ^ a b c d e "Bohor reedbuck (Redunca redunca)" (in English). ARKive. http://www.arkive.org/bohor-reedbuck/redunca-redunca/#text=All. 
  5. ^ a b c Newell, Tony Lynn. "Redunca redunca (Bohar reedbuck)" (in English). University of Michigan Museum of Zoology. Animal Diversity Web. http://animaldiversity.ummz.umich.edu/site/accounts/information/Redunca_redunca.html. 


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