| Zebra duiker | |
|---|---|
 | |
Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | Artiodactyla |
| Family: | Bovidae |
| Genus: | Cephalophus |
| Species: | C. zebra |
| Binomial name | |
| Cephalophus zebra Gray, 1838 | |
 | |
| Distribution of zebra duiker | |
Thezebra duiker (Cephalophus zebra) is a smallantelope found primarily inLiberia, as well as theIvory Coast,Sierra Leone, and occasionallyGuinea.[1] They are sometimes referred to as thebanded duiker orstriped-back duiker. It is believed to be one of the earliest duiker species to have evolved.[3]
| Phylogenetic relationships of the bay duiker (Johnston et.al. 2012) |
Thescientific name of the zebra duiker isCephalophus zebra. The bay duiker is classified under the genusCephalophus and the familyBovidae. It was firstdescribed by British zoologistJohn Edward Gray in 1838 inAnnals of Natural History.[4] Nosubspecies are identified.[5] Thegeneric name probably comes from the combination of theNew Latin wordcephal, meaning head, and theGreek wordlophos, meaning crest.[6] Thespecific namezebra pertains to the striking resemblance this duiker bears to the zebra due to the presence ofdorsal stripes.[7] The word "duiker" comes from the Afrikaans wordduik, or Dutchduiker—both mean "diver".[8] The zebra duiker is locally known as the marking deer inLiberia.[9]
A 2001phylogenetic study dividedCephalophus into three distinct lineages: the giant duikers, east African red duikers and west African red duikers. However, the status of two species, the zebra duiker and theAders' duiker, remained dubious.[10] In 2012, Anne R. Johnston (of theUniversity of Orleans) and colleagues constructed a cladogram of thesubfamily Cephalophinae (duiker) based onmitochondrial analysis. They showed that within the "giant duiker" group, thebay duiker formed a clade withJentink's duiker, and the zebra duiker is sister to this clade. Similarly, Abbott's duiker and yellow-backed duiker form a clade sister toSylvicapra. The bay duiker and Jentink's duiker probably evolved during thePleistocene, less than 2.5 million years ago.[11]
Zebra duikers have gold or red-brown coats with 12-16 distinctivezebra-like stripes, dark markings on their upper legs, and russet faces. Newborns appear darker because they are born with their stripes closer together. An adult can grow to 90 cm (35 in) in length, 45 cm (18 in) in height, and 20 kg (44 lb) in weight. Their horns are short and round with sharp pointed tips. They are about 4.5–5.0 cm (1.8–2.0 in) long in males, and half that in females. Female body size is larger than males, possibly due to long gestation periods.
Dental Formula:
0/3 I, 0/1 C, 3/2-3 P 3/3 M = 30-32 total[12]
Zebra duikers live in lowland primaryrainforests, particularly by clearings and along forest margins. They are most commonly found in forested areas of the midwestern parts of Africa.[13] They can less commonly be found in hill and low-mountain forests.
They are ruminants which feed primarily on fruit, foliage, and seeds. Though rare, there is evidence that they may eat rodents on occasion. Their reinforced nasal bones enable them to crack open the hard exterior of certain fruits.[14]
The gestation period is anywhere from 221 to 229 days and the female is receptive to mating about 10 days after parturition.[15]The mother will only birth one calf at a time. A newborn can weigh from 1270 to 1550 g at birth. During the first ten days after birth, referred to as the lactation period, a newborn grows at a rate of about 94 g/day.[16] After that, the growth rate decreases considerably. Females reach sexual maturity at 9–12 months of age and males reach sexual maturity at 12–18 months.Cephalophus zebra is the only duiker species with the diploid number 2n=58.
Zebra duikers have displayed diurnal activity when living in captive situations, but mostly nocturnal in the wild.They are solitary animals that form pair bonds for breeding purposes. Both the male and female participate in the defense of young and home range. Adaptations include stripes and thickened nasal/frontal bones. The stripes may reduce injury to the more vulnerable abdominal area. The stripes may also make it more difficult for some predators to identify by breaking up the outline of their forms. The nasal bones allow for protection against blunt force during altercations.
They are hunted for bush meat. Their hides and other inedible parts can also be utilized by humans.[17]
They are considered Vulnerable by theIUCN due to deforestation, loss of habitat, and overhunting within its range. Zebra duikers are common prey to Africanleopards,African golden cats,rock pythons, and thecrowned eagle. Additionally, some baboons and chimpanzees will hunt small antelope, such as the zebra duiker, with some troops being observed to have a preference for eating meat.
The zebra duiker has been described as the one duiker species that is the least-capable of adapting to environmental changes, thus granting it the fastest chance (and highest potential) to become extinct. The wild population is estimated at 28,000 individuals. This estimation is believed to be high, and continues to decline. Having once been more widespread, it is now more common in protected areas, in particular theGola National Park inSierra Leone,Sapo National Park inLiberia, andTaï National Park inIvory Coast.[18] In a study conducted to identify areas of greatest conservation need, one zebra duiker was identified in an unprotected area of theZiama Classified Forest of Guinea. This area is under consideration for classification as a national park, currently serving as a home to many other species categorized as rare or threatened.[19]
