Historically, Ansell split this R. sharpei into two subspecies. In the northern parts of the range it was classified as R. s. sharpei and in the southern parts of the range was classified as R. s. colonicus. The geographic borders of these subspecies and their validity are still in question. Most literature does not refer to subspecies.
It has been suggested by Kingdon that R. sharpei may be more closely related to the dwarf antelopes of the genus Neotragus than to other species of the genus Raphicerus.
Raphicerus sharpei possesses preputial, eye and facial glands that are used in scent-based communication. In addition, these animals use tactile communication in fighting and mating, as well as between mothers and their offspring. Some visual communication may occur, with regard to body posturing, especially during aggressive encounters.
Communication Channels: visual ; tactile ; chemical
Other Communication Modes: scent marks
Perception Channels: visual ; tactile ; acoustic ; chemical
Nowak (1991) reported that this species may be threatened by human sprawl in East Africa and has become rare in some parts of their range. The IUCN Red List classifies this species as a lower risk, conservation dependent species (LR/cd). The major threats identified by the IUCN are habitat loss due to the spread of the human population and ongoing harvesting by hunters. Given the large national parks in southern Africa and the populations of Sharpe's grysboks found within these parks, there is little concern of serious decline of this species if continued conservation of National Park land persists.
US Federal List: no special status
CITES: no special status
IUCN Red List of Threatened Species: least concern
It has been reported that this species may cause damage to crops.
Negative Impacts: crop pest
Sharpe's grysboks are of positive economic value to humans as they are hunted for meat, hide and sport in many areas throughout the species' range.
Positive Impacts: food ; body parts are source of valuable material
Little information about the ecosystem roles served by the Sharpe's grysboks has been documented. Given its status as a prey species to numerous predators, it is assumed that its role as a food source for carnivorous predators is important. It is likely to affect vegetative growth through its browsing behavior.
All members of the genus Raphicerus are browsers and grazers. A study conducted in southeastern Zimbabwe by Wilson examined the stomachs of 91 R. sharpei specimens and found that it is predominantly a browser, with browse accounting for 70% of the stomach contents. Sharpe's grysboks will feed on some fruit as well as roots and tubers they unearths with their hooves. They apparently do not require access to free water but, if available, will drink it.
Plant Foods: leaves; roots and tubers; wood, bark, or stems; fruit
Primary Diet: herbivore (Folivore )
Sharpe's grysboks, Raphicerus sharpei, are constrained south of the equator in central and southern Tanzania to northeastern South Africa.
Biogeographic Regions: ethiopian (Native )
Raphicerus sharpei may be found in a variety of habitats but most often in rocky, hilly country. These animals seem to avoid large areas of grass standing greater than 50 cm tall, and appear to require some shrub thickets and areas with undercover, as are often found in secondary growth forest. Sharpe's grysboks have been documented in areas with little ground cover, though this is abnormal relative to most recorded observations of habitat use.
Habitat Regions: temperate ; terrestrial
Terrestrial Biomes: savanna or grassland ; chaparral ; forest
Information pertaining to the lifespan/longevity of the Sharpe's grysbok was not available.
Sharpe's grysboks are small, with a mass of 7 to 16 kg, a height of 45 to 55 cm, a head to body length of 65 to 75 cm, a tail length of 4 to 8cm, and a horn length (males only) of about 5 cm. The largest horn length on record is over twice the normal length, at 10.48 cm. Females of this species are slightly larger than the males, but information on individual ranges was not available.
Body color is a rufous to reddish brown broken with speckles of white giving the animal a grizzled appearance. The sides of the face, forehead, upperparts of the muzzle, and outer parts of the limbs are a yellowish-brown color. The belly, underside of the neck, and inside of the legs and ears are a buffy-white. A whitish ring around the eyes extends as a line down the sides of the muzzle to the rhinarium.
Raphicerus sharpei is easily distinguished from other members of the genus. Raphicerus sharpei lacks false hooves as does Raphicerus campestris (steenbok) whereas Raphicerus melanotis (grysbok) has false hooves. The normal tooth formula for Sharpe's grysboks is 0/3 0/1 3/3 3/3. Child and Riney (1964) found only 1 case of abnormal dentition in 121 examined specimens (0.83%) that were from a small area of Southern Rhodesia. The abnormality was found in a female that had upper canines.
Range mass: 7 to 16 kg.
Range length: 65 to 75 cm.
Other Physical Features: endothermic ; homoiothermic; bilateral symmetry
Sexual Dimorphism: female larger; ornamentation
Sharpe's grysboks usually use thick vegetation and dense undercover to hide from predators. They will use old burrows, especially of aardvarks, as means of evading from predators.
Known Predators:
Information pertaining to the mating system of the Sharpe's grysboks was not available. However, other members of the genus may be polygynous or pairs may defend territories together. It is likely that these animals are similar to congeners.
Raphicerus sharpei can breed throughout the year. Most records show a peak in breeding between November and December. This proposed peak coincides with the start of the spring rains in southern Africa where this species is found. After a gestation of approximately 180 days (ranging from 168 to 210 days) one to two young will be produced. Weaning of the young will occur at 3 months of age and sexual maturity will be reached for both sexes after 6 to 19 months.
Breeding interval: These animals are apparently capable of breeding annually.
Breeding season: Raphicerus sharpei can breed throughout the year, but births are timed to coincide largely with the start of the rainy season.
Range number of offspring: 1 to 2.
Range gestation period: 5.6 to 7 months.
Average weaning age: 3 months.
Range age at sexual or reproductive maturity (female): 6 to 19 months.
Range age at sexual or reproductive maturity (male): 6 to 19 months.
Key Reproductive Features: iteroparous ; year-round breeding ; gonochoric/gonochoristic/dioecious (sexes separate); sexual ; fertilization ; viviparous
Little information is available on the parental care of this species. As in other mammals, the female provides the bulk of the parental care. Female Sharpe's grysboks will begin weaning young when offspring reach about 3 months of age. At 6 to 19 months of age, offspring will have reached sexual maturity and are already independent. The role of the father in parental care has not been recorded.
Parental Investment: no parental involvement; altricial ; pre-fertilization (Protecting: Female); pre-hatching/birth (Provisioning: Female, Protecting: Female); pre-weaning/fledging (Provisioning: Female, Protecting: Female); pre-independence (Protecting: Female)
Sharpe's or northern grysbok (Raphicerus sharpei) is a small, shy, solitary antelope that is found from tropical to south-eastern Africa.
They are found in the Transvaal (South Africa), the Caprivi Strip (Namibia), Botswana, Mozambique, Zimbabwe, Zambia, Malawi and Tanzania to Lake Victoria.
It is similar in size to the gray duiker, but has a stockier body and shaggy fur over the hindquarters. It stands about 20" (45–60 cm) at the shoulders and weighs only 7–11.5 kg. Its coat is reddish-brown streaked with white; eye-rings, muzzle, throat and underside are off-white. The males have stubby horns, which are widely spaced. Sharpe's grysbok has a short, deep muzzle with large mouth and heavy molars for grinding. The short neck and head on a long-legged body result in a high-rumped posture when browsing.
Although widespread, Sharpe's grysbok is infrequently seen. Males and females seem to form brief associations, but the species is usually encountered singly. Territory is marked with dung middens. Their habitat is rocky hill country, but preferring fertile zones on the lower slopes. They are nocturnal browsers and spend the day in the protective cover of tall grass or shrubs. They are extremely timid and will run away at the first sign of anything unusual, although this flight is accompanied "short stamping hops";[2] they move well away from where the disturbance occurred before stopping (unlike steenbok, which stop and look back).[3] Sharpe's Grysbok are reported to take refuge in aardvark burrows, like steenbok.
Sharpe's grysbok browse on leaves, buds, herb and fruits—in the dry season, their food is typically tough (for which their teeth and jaws are adapted). Grazed grass makes up about 30% of their diet.[2] Like the Cape grysbok they use a communal latrine and mark sticks in its vicinity with pre-orbital gland secretions.[4]
The closely related Cape (or southern) grysbok (R. melanotis) occurs in the western Cape region. Haltenorth and Diller[5] consider R. sharpei as a subspecies of R. melanotis.
Sharpe's or northern grysbok (Raphicerus sharpei) is a small, shy, solitary antelope that is found from tropical to south-eastern Africa.
