Mentawai langur[1]
CITES Appendix I (CITES)[3]
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Primates
Suborder: Haplorhini
Infraorder: Simiiformes
Family: Cercopithecidae
Genus: Presbytis
Species:
P. potenziani
Binomial name
Presbytis potenziani
(Bonaparte, 1856)
Mentawai langur range

The Mentawai langur (Presbytis potenziani) is a species of primate in the family Cercopithecidae. It is endemic to the Mentawai Islands in Indonesia. Its natural habitat is subtropical or tropical dry forests.[2] The Siberut langur (P. siberu) was formerly considered a subspecies of the Mentawai langur.[4][5]

Description

Mentawai langur infants are born with a white pelage. After two to three weeks, the pelage begins to darken and the face becomes darkly pigmented. This change of coloration begins in the dorsal midline and head and ends laterally. After three months, the belly and chest are dark reddish-brown, throat, cheeks, forehead and tip of tail are white and the rest of the body is jet black. Males are differentiated from females by having a white circumgenital patch of fur.[6] Mentawai langurs have a slender body with hind limbs longer than their forelimbs.[7]

Distribution and habitat

Mentawai langurs are endemic to the islands of Sipora, North Pagai, and South Pagai.[8][9][10] They inhabit primary and secondary forests dominated by dipterocarps.[11] The trees used by Presbytis potenziani as sleeping areas are typically 35 metres (115 ft) in height.[9][11] The langurs sleep in the mid-upper levels of these trees above 20 metres (66 ft), where the canopy density is thickest, with the most common sites being in coconut groves.[11][2][7]

Behavior and diet

On average, groups of Mentawai langurs travel 540 metres (1,770 ft) each day.[11][2] Heavy rainfall affects movement patterns light to moderate rainfall does not. The langurs move by quadrupedal running and climbing; they also leap in the mid and upper portions of the canopy and drop when nearer to the ground.[11] Home ranges vary from 11 to 40 hectares (27 to 99 acres).[7] The groups are not migrants.[2] Their social organisation is variable: unimale-unifemale, unimale-multifemale, multimale-multifemale.[2]

Mentawai langurs spend more than 80% of their time resting and foraging and only a small portion traveling and conducting social behavior. Such extensive periods of resting and foraging are required for colobines that consume seeds, unripe fruits and leaves to support their digestion.[7] Adult males typically move away from the group in the early morning and give long calls.[11]

The langurs feed in the upper portion of the canopy. In some areas, their diet consists of 55% leaves, 32% fruit and seed and 13% other source of food such as flowers, bark, sap, and fungi.[11] but groups that forage in secondary forests have a diet of 70% fruits and seeds and up to 35% "climber" type vegetation.[2] The niche breadth of Presbytis potenziani is 0.22, based on Levin's index.[7]

Conservation

The Mentawai langur is currently listed as critically endangered on the IUCN Red List.[2] Over the 36 years prior to 2021, the population is estimated to have declined by 80%.[2] The main threats to the monkeys are humans hunting for food and destruction of the habitat for agriculture. 25% of the hunting on Mentawai langur is by natives of central-south Siberut.[9] Recommendations to conserve the species include development of a biosphere reserve on Siberut Island, creation of a primate reserve on South Pagai Island and offshore islands, a survey of primates on Sipora Island, a captive breeding program to recover the endemic subspecies of Mentawai primates on the southern islands, and beginning a campaign in education and law enforcement to prevent hunting of Mentawai langurs.[8]

References

  1. ↑ Groves, C. P. (2005). Wilson, D. E.; Reeder, D. M. (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Baltimore: Johns Hopkins University Press. p. 172. ISBN 0-801-88221-4. OCLC 62265494.
  2. 1 2 3 4 5 6 7 8 9 Setiawan, A.; Quinten, M.; Cheyne, S.; Traeholt, C.; Whittaker, D. (2020). "Presbytis potenziani". IUCN Red List of Threatened Species. 2020: e.T39815A17954456. doi:10.2305/IUCN.UK.2020-2.RLTS.T39815A17954456.en. Retrieved 14 November 2021.
  3. ↑ "Appendices | CITES". cites.org. Retrieved 2022-01-14.
  4. ↑ "Presbytis siberu". American Society of Mammalogists. Retrieved 2020-04-08.
  5. ↑ Meyer, Dirk; Rinaldi, Ir. Dones; Ramlee, Hatta; Perwitasari-Farajallah, Dyah; Hodges, Keith; Roos, Christian (2011). "Mitochondrial phylogeny of leaf monkeys (genus Presbytis, Eschscholtz, 1821) with implications for taxonomy and conservation". Molecular Phylogenetics and Evolution. 59 (2): 311–319. doi:10.1016/j.ympev.2011.02.015. PMID 21333742. Retrieved 2020-04-08.
  6. ↑ Tilson, R. L. (December 1976). "Infant Coloration and Taxonomic Affinity of the Mentawai Islands Leaf Monkey, Presbytis potenziani". Journal of Mammalogy. 57 (4): 766–769. doi:10.2307/1379453. ISSN 1545-1542. JSTOR 1379453.
  7. 1 2 3 4 5 Hadi, Susilo; Ziegler, Thomas; Waltert, Matthias; Syamsuri, Fauzan; Mühlenberg, Michael; Hodges, J. Keith (2012-02-01). "Habitat Use and Trophic Niche Overlap of Two Sympatric Colobines, Presbytis potenziani and Simias concolor, on Siberut Island, Indonesia". International Journal of Primatology. 33 (1): 218–232. doi:10.1007/s10764-011-9567-y. ISSN 1573-8604. S2CID 11087889.
  8. 1 2 Whittaker, Danielle J. (May 2006). "A Conservation Action Plan for the Mentawai Primates". Primate Conservation. 2006 (20): 95–105. doi:10.1896/0898-6207.20.1.95. ISSN 0898-6207. S2CID 85765480.
  9. 1 2 3 Watanabe, Kunio (April 1981). "Variations in group composition and population density of the two sympatric Mentawaian leaf-monkeys". Primates. 22 (2): 145–160. doi:10.1007/BF02382606. ISSN 1610-7365. S2CID 25252841.
  10. ↑ Waltert, Matthias; Abegg, Christophe; Ziegler, Thomas; Hadi, Susilo; Priata, Dodi; Hodges, Keith (July 2008). "Abundance and community structure of Mentawai primates in the Peleonan forest, north Siberut, Indonesia". Oryx. 42 (3): 375–379. doi:10.1017/S0030605308000793. ISSN 1365-3008. S2CID 208530127.
  11. 1 2 3 4 5 6 7 Hadi, Susilo (2011-10-31). "Feeding Ecology of Mentawai langur (Presbytis potenziani) in Siberut, Mentawai Islands". Proceeding ICBB (The International Conference on Bioscience and Biotechnology). 1 (1): B39–B43. ISSN 2088-9771.
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