| Aders's duiker | |
|---|---|
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Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | Artiodactyla |
| Family: | Bovidae |
| Genus: | Cephalophus |
| Species: | C. adersi |
| Binomial name | |
| Cephalophus adersi Thomas, 1918 | |
 | |
| Distribution of Aders's duiker | |
| Synonyms | |
Leucocephalophus adersi(Thomas, 1918) | |
Aders's duiker (Cephalophus adersi), also known asnunga inSwahili,kunga marara in Kipokomo andharake inGiriama, is a small, forest-dwellingduiker found only inZanzibar andKenya. It may be a subspecies of thered,Harvey's, orPeters's duiker or a hybrid of a combination of these. A 2022 study proposed to moveC. adersi into its own new genus,Leucocephalophus.[2] It is named after W. Mansfield Aders, a zoologist with the Zanzibar Government Service.
The Aders's duiker stands at around 30 cm (12 in) tall at the shoulder. Its weight varies greatly depending on geographical location; those in eastern Zanzibar weigh 12 kg (26 lb), while those in the south weigh only 7.5 kg (17 lb).[citation needed] Its coat is reddish-brown, grayer on the neck, and lighter down the backside and underneath. A small red crest runs along the head. It also has small, simple horns of 3 to 6 cm (1.2 to 2.4 in). The muzzle is pointed, and the nose has a flat front. The ears measure 7.0–8.3 cm (2.8–3.3 in) long, with a marked cowlick or whorl of hair on the nape of the neck.
Aders's duikers live primarily in coastal forests and woodlands in Africa. The species can live in quite dry scrub near the sea or among coral outcrops; in Zanzibar, they are restricted to tall thicket forest growing on waterless coral rag.[citation needed] In Arabuko Sokoke (Kenya), they are most often trapped withinCynometra vegetation, especially on "red soil".C. adersi is sympatric withC. harveyi on the mainland and withC. monticola sundevalli on Zanzibar, although nothing is known regarding their ecological separation.
The species is very shy, alert, and sensitive to sound. As a result, common methods of hunting include the brute-force method of driving the duikers into nets with dogs, or silent ambush at feeding sites.[citation needed]
Aders's duikers live in coastalforests,thickets andwoodlands, where they eatflowers,leaves, andfruit which has fallen from theforest canopy. The species appears to bediurnal, as it is rarely seen active at night. Typical feeding patterns are from dawn to late morning, which is followed by a period of rest and rumination. At midafternoon, Aders's duikers generally become active, and will continue foraging until nightfall.
They are generally solitary or found in small groups of two or three. They often pick up scraps dropped by monkeys and birds foraging in the trees.[3]
The species shows a particular dependence on the flowers and berries which grow prolifically from trees common to the area, such as ebony (Diospyros consolatae), kudu berry (Cassine aethiopica) and bush guarri (Euclea racemosa), and bushes such as turkey berry (Canthium spp.) andPolyspheria. In addition to these, they will eat sprouts, buds, and other fresh growth found at ground level. This duiker species can apparently manage without drinking, getting most of the hydration they need from their diets.
These duikers have extremely specific habitat requirements, being found only in areas of old-growth thicket, with the highest population densities (11.4±5.18 per km2)[4] recorded in relatively undisturbed high thicket. However, Kanga (1999) did report some Aders's duikers in secondary thicket. In the Arabuko-Sokoke Forest in Kenya, Aders's duikers inhabit regions ofCyanometra forest.
Not much is known of its reproductive habits, although they may breed all year long.[citation needed]
They are threatened byhabitat destruction,feral dogs, and overhunting. They are particularly sought by humans due to their soft skin and meat.[citation needed] The population inZanzibar had declined from 5000 in 1983 to 640 in 1999,[citation needed] and it will probably continue to decrease rapidly. They are listed as vulnerable by IUCN.[5] InKenya, the duiker is present at very low densities, though the decline is probably not as severe as the other population.[citation needed]
Several conservation plans have been made, and a captive-breeding program has been proposed.
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