Siberut langur
| Siberut langur | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Presbytis siberu | ||||||||||||
| Chasen & Kloss , 1923 |
The Siberut langur ( Presbytis siberu , Syn . : P. potentiani siberu ) is a primate species from the group of the slender monkeys (Presbytini), which occurs endemically on the Indonesian island of Siberut , west of Sumatra . Originally the species was assigned to the Mentawai langur ( P. potentiani ) as a subspecies, but genetic differences led to it being classified as an independent species.
features
The Siberut langur reaches a head-trunk length of about 48 to 50 cm, a tail length of 58 to 64 cm, and a weight of about 6.5 kg. Adult monkeys are almost entirely black in color, only the face is framed by a white fringe of hair, a strip of white hair runs down the neck. The pubic region is also white, as is the scrotum in males . The chest, abdomen and the inside of the arms and legs are reddish-brown to reddish-orange. The black hairless skin of the face becomes a little lighter around the mouth. The color of the Siberut langur is very similar to the Mentawai langur, only the lower part of the body is darker and the white pubic region is more sharply demarcated from the rest of the fur. The monkeys have a small tuft of hair on their head, made up of hair that is directed slightly forward. A sexual dimorphism is almost nonexistent. Newborns have a white coat and light skin, but get the dark adult color after 12 to 14 days.
Way of life
The Siberut langur occurs in primary and secondary, evergreen, lowland rainforests, in tree-lined swamps, forests and possibly also in mangrove forests . He lives here sympathetically with three other species of monkey, the Kloss gibbon , the Pageh snub nose and the Siberut macaque . The island's climate is very humid with annual rainfall of up to 4000 mm. The monkeys spend most of their time at medium heights, the rest in the canopy of the trees. Their diet has not yet been researched in detail, but like that of all langurs it will primarily consist of fruits and leaves. Males start the day early in the morning at 3 to 5 a.m. with loud calls. Siberut langurs leave their sleeping trees early, probably to avoid food competition with the lump gibbon. A total of 25 to 33% of the time of the day is spent eating, 45 to 55% resting. Social activities only take up 1 to 2% of the time and social grooming is rarely observed.
Danger
The International Union for Conservation of Nature and Natural Resources ( IUCN ) estimates the population of the Siberut langur to be endangered (endangered). Its population has decreased by 50% over the past 40 years due to habitat loss and hunting.
literature
- D. Zinner, GH Fickenscher & C. Roos: Family Cercopithecidae (Old World monkeys). Pages 721 and 722 in Russell A. Mittermeier , Anthony B. Rylands & Don E. Wilson : Handbook of the Mammals of the World: Primates: 3rd ISBN 978-8496553897
Web links
- Presbytis potentiani ssp. Siberu in the endangered Red List species the IUCN 2008. Posted by: Nijman, V. & Manullang, B., 2008. Accessed June 18, 2015.