Jump to content

Tana River red colobus

From Wikipedia, the free encyclopedia

This is an old revision of this page, as edited by 13C EXT2013 (talk | contribs) at 03:54, 25 October 2013. The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

Tana River red colobus[1]
File:Colobus-monkey.jpeg
Tana River Red Colobus Monkey
Scientific classification
Kingdom:
Animalia
Phylum:
Chordata
Class:
Mammalia
Order:
Primates
Family:
Cercopithecidae
Genus:
Procolobus
Subgenus:
Piliocolobus
Species:
P. rufomitratus
Binomial name
Procolobus rufomitratus
(Peters, 1879)

The Tana River red colobus (Procolobus rufomitratus), also called the eastern red colobus, is an Old World Monkey that is highly endangered species of primate in the Cercopithecidae family. It is endemic to a narrow zone of gallery forest near the Tana River in southeastern Kenya. As all red colobuses, it was formerly considered a subspecies of a widespread P. badius.[3]

Conservation status

The conservation status of most of Red Colobus taxa is unknown. However, ≥6 are critically endangered, endangered or threatened with extinction and a seventh is virtually extinct. In other words, ≥38.9% of the red colobus taxa are threatened with extinction in the near future. [4] The Tana River red colobus has been considered one of The World's 25 Most Endangered Primates.[5][6] It was, together with the equally endangered Tana River mangabey, the main reason for the creation of the Tana River Primate Reserve in 1978,[7] but human encroachment within this reserve continues.[8] Recently, it has been suggested that 20,000 hectares of the Tana River Delta should be transformed into sugarcane plantations, but this has, temporarily at least, been stopped by the High Court of Kenya.[9] Contra Groves,[1] it was not recognized as a species separate from the Ugandan, Central African and Thollon's red colobus in the 2008 IUCN Red List. With these as subspecies, P. rufomitratus is considered to be of least concern in the 2008 IUCN Red List,[10] while P. (r.) rufomitratus is considered endangered.[2] The Tana River Red Colobus has been under the watch of the Tana River Primate National Reserve (TRPNR), They put forward numerous amounts of research and studies into the conservation of the Tana River Red Colobus. They found that only 37% of the Red Colossuses lived inside the preservation itself. These findings have brought the conservation strategy into question. [11]

What's Causing Endangerment

The Tana River Red Colobus is located only on a very small section of the world. What's causing its current endangerment is the deforestation and the hunting done by humans. [12] Tropical forests are constantly being cut down, causing the destruction of habitat for the Red Colobus.  Cultivation and dyke construction had the most devastating human impact, which involved partial or complete forest clearing resulting in further fragmentation of forest patches. [13] The Tana River red colobus and the Tana River mangabey are both seriously endangered by forest loss and destruction instigated by an increasing human population. Forest is vacant primarily for agriculture; in the last 20 years approximately 50% of the unique forest has been lost. [14] The red colobus have also seen to decline in number due to predation by Chimpanzees. [15]

Diet

Colobus monkeys eat mostly leaves from a limited number of tree species. They supplement this bulky cellulose diet with occasional unripe fruit, moss and seeds. Human food is of no interest to these leaf specialists. Their stomachs are large and have three chambers, and carry a specific bacterium which helps to ferment and digest the leaves. They eat about two to three kilograms of leaves a day. Sometimes they eat soil, clay and charcoal to help digest toxins and toxic leaves. Because of the poor nutritional quality of their food, they must browse intensively for many hours each day looking for food, and spend much of the remainder of the day resting to aid digestion.[citation needed]

Habitat

The Tana River Red Colobus monkey gets its name from where it resides, along forests along the floodplain in the lower Tana River in eastern Kenya, the country's longest river. The river is roughly 1,000 km long. When the river in a flood, the floodplain measures from one to six km in width, and about 60 to 100 m in width when not in a flood. Floods occur roughly once a year, with a major flood occurring every three years. Although the floodplain is mostly grassy, there are places where bushland, woodland, and forests reside. Forest is cleared mainly for agriculture; an estimated 50% of the original forest has been lost in the last 20 years. In addition, people use the remaining forest for materials to build homes and canoes, and for other non-timber forest products. [16]

Climate

The lower Tana River is generally hot and dry, with temperatures ranging from 86°F to 100°F (30°C to 38°C). The hottest months generally occur during January and February while the coldest months are May through July. The average annual rainfall is between 500 and 600 mm, with the wettest months being March and April and the driest being November and December.

Vegetation

The main vegetation that appears along the lower Tana River includes grassland, wooded grassland, bushland, deciduous woodland and lowland evergreen forest. Due to human disturbances as well as floods, patchy distributions of forests have resulted. [17] There was also a study in 1988 to determine what was causing the drastic decline of the Crested Mangabey and the Tana River Red Colobus. The forest was found to be regenerating and casuing a new kind of vegetation to appeal to newer species. This could have been a cause in their drop of numbers.[18]

Reproduction

The tana river red colobus has a polygynous mating system especially when only one male is present. The dominance hierarchy typically determines which individuals are allowed to mate. Little is known about the reproductive cycle in the wild due to this species constant migration. The dominant male usually mates with females within the same social group. Females initiate mating through courtship displays and copulation calls. Red Colobus monkeys breed throughout the year, and have a gestation period of about 4.5 to 5.5 months. Infants cling to their mother’s underbelly. Up until about 3.5 months in age infants travel only one meter away from the mother. By 3.5 to 5.5 they usually play with other monkeys. Females leave the group around 18 months of age and continue to move from group to group. Males may leave the group during adolescence but have a harder time being accepted into other social groups due to hierarchy. [19]

References

  1. ^ a b 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. 170. ISBN 0-801-88221-4. OCLC 62265494.
  2. ^ a b Template:IUCN2008
  3. ^ Kingdon, J. 1997. The Kingdon Guide to African Mammals. Academic Press Limited, London. ISBN 0-12-408355-2
  4. ^ (Struhsaker, 2004) http://evolutionaryanthropology.duke.edu/uploads/assets/struh%20conservation%20of%20red%20colobus%20and%20their%20habitats.pdf
  5. ^ Butynski, T. M. 2005. Tana River Red Colobus, Procolobus rufomitratus (Peters, 1879). In: Primates in Peril: The World's 25 Most Endangered Primates 2004-2006, R. A. Mittermeier, C. Valladares-Pádua, A. B. Rylands, A. A. Eudey, T. M. Butynski, J. U. Ganzhorn, R. Kormos, J. M. Aguiar and S. Walker (eds.), p.17. Report to IUCN/SSC Primate Specialist Group (PSG), International Primatological Society (IPS) and Conservation International (CI), Washington, DC.
  6. ^ Mittermeier, R.A.; Wallis, J.; Rylands, A.B.; Ganzhorn, J.U.; Oates, J.F.; Williamson, E.A.; Palacios, E.; Heymann, E.W.; Kierulff, M.C.M.; Long Yongcheng; Supriatna, J.; Roos, C.; Walker, S.; Cortés-Ortiz, L.; Schwitzer, C., eds. (2009). "Primates in Peril: The World's 25 Most Endangered Primates 2008–2010" (PDF). Illustrated by S.D. Nash. Arlington, VA.: IUCN/SSC Primate Specialist Group (PSG), International Primatological Society (IPS), and Conservation International (CI): 1–92. ISBN 978-1-934151-34-1. {{cite journal}}: Cite journal requires |journal= (help)
  7. ^ "Kenya Wildlife Service – Tana River Primate Reserve". www.kws.org. Retrieved 2009-12-30. [dead link]
  8. ^ Kenya’s rare monkey species threatened with extinction . African Conservation Foundation. Accessed 2008-07-20
  9. ^ Tana gets temporary reprieve. BirdLife International. Accessed 2008-07-20
  10. ^ Template:IUCN2008
  11. ^ Biological Conservation Vol 120, Issue 1, Nov 2004, pg 91-99
  12. ^ ICUN Red List,http://www.iucnredlist.org/details/39993/0
  13. ^ Human and natural impacts on forests along lower Tana river, Kenya: implications towards conservation and management of endemic primate species and their habitat,Biodiversity and Conservation April 2007, Volume 16, Issue 4, pp 1161-1173
  14. ^ Monkey Knife Fight, http://www.monkeyknifefight.co.uk/tana-river-red-colobus.html
  15. ^ (Oates et al, 2008) http://www.iucnredlist.org/details/39993/0
  16. ^ (Mbora & Butynski 2002-2008) http://www.primate-sg.org/storage/PDF/Tana%20River%20Red%20Colobus.pdf
  17. ^ T.M. Butynski, G. Mwangi. 1994. "Conservation Status and Distribution of the Tana River Red ColobusS and Crested Mangabey". http://coastalforests.tfcg.org/pubs/Tana_Colobus_Mangabey.pdf. October 23, 2013
  18. ^ The Tana River forests, Kenya: small, dynamic, and endangered, Focus, Summer 1993, Vol. 43, pg 15-22
  19. ^ Jones, J. 2002. "Piliocolobus rufomitratus" (On-line), Animal Diversity Web. Accessed October 24, 2013 at http://animaldiversity.ummz.umich.edu/accounts/Piliocolobus_rufomitratus
Retrieved from "https://en.wikipedia.org/w/index.php?title=Tana_River_red_colobus&oldid=578645161"