Gelada
From Wikipedia, the free encyclopedia
 |
||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 A male Gelada
|
||||||||||||||
|
|
||||||||||||||
| Scientific classification | ||||||||||||||
|
||||||||||||||
|
|
||||||||||||||
| Theropithecus gelada (Rüppell, 1835) |
The Gelada (Theropithecus gelada), sometimes called the Gelada Baboon, is a species of Old World monkey found only in the Ethiopian Highlands of Ethiopia and Eritrea, with large populations in the Semien Mountains. Theropithecus is derived from the Greek root words for "beast-ape."[3][4] Like its close relatives the baboons (genus Papio), it is largely terrestrial, spending much of its time foraging in grasslands. Since 1979 it has been customary to place the Gelada in its own particular genus (Theropithecus), though some genetic research suggests that this monkey should, in fact, be grouped with its papionine kin;[5] other researchers have classified this species even further distant from Papio.[6] While Theropithecus gelada is the only living species of its genus, at least two separate lineages are known from the fossil record. Theropithecus, while restricted at present to Ethiopia and Eritrea, is also known from fossil specimens found in Africa and the Mediterranean into Asia, including South Africa, Malawi, the Democratic Republic of the Congo, Tanzania, Uganda, Kenya, Ethiopia, Algeria, Morocco, Spain, and India.
Contents |
[edit] Appearance
Theropithecus gelada can be physically distinguished from baboons by the bright patch of skin on its chest. This patch is hourglass-shaped, and on males, bright red and surrounded by white hair. On females the patch is far less pronounced. However, when in oestrus, the female's patch will brighten, and a "necklace" of fluid-filled blisters forms on the patch. This is thought to be analogous to the swollen buttocks common to most baboons experiencing oestrus. This modification likely came about due to the Gelada's unique mode of feeding - it spends most of its waking hours grazing from an upright sitting position, rump hidden beneath and so unavailable for display. The male Gelada's tail is about as long as the body and densely tufted at the tip; it also has a long and flowing mantle and mane.
The Gelada lives in small harems consisting of one male, several females, and their offspring. These smaller bands often join together to feed, forming groups of upwards of 350 individual monkeys. At especially good feeding spots, groups in excess of 670 individuals have been observed.
[edit] Diet
The Gelada is exclusively herbivorous but is specialised as a grass-eater, consuming every part of the plant (but favoring one part over the others depending upon season), from green blades (in the wet season) to seeds to rhizomes (in the dry season) to stalks, flowers and fruits. It has the most opposable thumb of any of the catarrhine primates (not including humans), allowing it to pick apart grasses with great dexterity to select the most nourishing meal. It is one of the only true grazing monkeys.[7]
[edit] Endangered
Although not listed as endangered, only 50,000-60,000 Geladas are known to exist. Hunting and habitat destruction have forced the Gelada into areas formerly inhabited only by the Olive Baboon, and hybridisation between the two species has been observed.
There are two subspecies of Gelada:
- Theropithecus gelada gelada
- Eastern Gelada, Theropithecus gelada obscurus
[edit] References
- ^ Groves, Colin (16 November 2005). in Wilson, D. E., and Reeder, D. M. (eds): Mammal Species of the World, 3rd edition, Johns Hopkins University Press, 167. ISBN 0-801-88221-4.
- ^ Primate Specialist Group (1996). Theropithecus gelada. 2006 IUCN Red List of Threatened Species. IUCN 2006. Retrieved on 2006-05-11.
- ^ Classic Roots P (HTML). PHTHIRAPTERA CENTRAL. Retrieved on December 26, 2006. “thero (G) - A wild beast; summer; hunt for”
- ^ Classic Roots T (HTML). PHTHIRAPTERA CENTRAL. Retrieved on December 26, 2006. “pithec, -o, -us (G) - An ape”
- ^ Goodman, M., et al. (1998). "Toward a phylogenetic classification of Primates based on DNA evidence complemented by fossil evidence". Molecular Phylogenetics and Evolution 9: 585-598.
- ^ McKenna, M.C., Bell, S.K. (1997). Classification of mammals above the species level. New York: Columbia University Press, 631 pp.
- ^ Hiller, C. (2000). "Theropithecus gelada" (On-line). Animal Diversity Web. Retrieved on December 23, 2006.
[edit] External links
