Wolf's Mona Monkey
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 Wolf's Mona Monkey at the Henry Doorly Zoo
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| Cercopithecus wolfi (Meyer, 1891) |
The Wolf's Mona Monkey (Cercopithecus wolfi), also called Wolf's Guenon, is a colorful Old World monkey in the Cercopithecidae family.
Wolf's Mona Monkey is found in central Africa, primarily between the Democratic Republic of the Congo and Uganda. It lives in primary and secondary lowland rainforest and swamp forest.
Guenons, the largest group of African primates, are very colorful. Their color is used in intraspecific communication for recognizing individuals, species, and potential mates. Wolf's Mona Monkey is dark grey with a red "saddle" on its back. The ventral side is white or yellow depending on the subspecies: C. wolfi wolfi and C. wolfi pyrogaster are yellow, and C. wolfi elegans is white. The appendages are mainly black (arms and tail) and red (legs); however there are slight patterning changes depending on subspecies. Ear tufts are white or red depending on subspecies. The male's scrotum is blue.[2] Wolf's Mona Monkey is also sexually dimorphic in size. Males weigh, on average, almost twice as much as females (4.5 kg and 2.5 kg respectively).[3]. Its small size makes it susceptible to predators, especially the Crowned Eagle and the Leopard.
Wolf's Mona Monkey is in the C. mona grouping within the Cercopithecus genus along with Campbell's Mona Monkey (C. campbelli), Dent's Mona Monkey (C. denti), Lowe's Mona Monkey (C. lowei), the Mona Monkey (C. mona), and the Crested Mona Monkey (C. pogonias).[1] Wolf's Mona Monkey was previously considered a subspecies of the Crested Mona Monkey.[4][1] The Cercopithecus genus is a member of the Cercopithecinae subfamily along with baboons, mangabeys, and macaques. This subfamily shares several common traits such as cheek pouches, low and rounded molar cusps, and simple stomachs; all adaptations to a frugivorous diet.
The diet of Wolf's Mona Monkey differs depending on location. It mainly consists of leaves and fruits, but may also include seeds and insects for protein. Since it has no adaptations for leaf eating, its leaf diet mainly consists of young and easily digestible leaves.
The birth season for Wolf's Mona Monkey is from June through December due to rainfall and resource availability. It lives in a single male/multi-female group. It is female philopatric, with males dispersing from the group at sexual maturity. Because one male controls several females there is extreme competition for the alpha male position. Females, on the other hand, are generally amicable and participate in grooming and allomothering. Unlike macaques there are no strong linear dominance hierarchies.
Conspecific groups are generally intolerant of each other. Both males and females behave aggressively in intergroup encounters. They are very territorial, using calling and aggression (if needed). Females play an important role in territory defense; when they call it prompts the male to call as well.
Among cercopithecines, forest guenons such as Wolf's Mona Monkey have very developed cheek pouches. These cheek pouches are second only to macaques. The evolution of these cheek pouches in both genera may be a response to the increased potential for interspecific competition in the mixed-species associations which these monkeys frequently form.[5]
Wolf's Mona Monkey is known to associate with several guenon and non-guenon species such as the Black Crested Mangabey, the Red-tailed Monkey, the Angola Colobus, Allen's Swamp Monkey, and the Bonobo. No viable offspring or interspecific mating occurs during its associations with other primates.
In one study, Wolf's Mona Monkeys were found associating with Bonobos within 20 meters for an average time of 20 minutes (although sometimes for over an hour). These interactions were mainly initiated by, and departed by, the guenons; this indicates that the guenons most benefited from these associations. Although the Common Chimpanzee is known to hunt sympatric primates, this is not the case with the Bonobo. No aggressive interactions occurred during the study period. The Red-tailed Monkey (C. ascanius) was also found to associate with Bonobos, and on five occasions the association was initiated by a mixed group of guenons (C. ascanius and C. wolfi). When a mixed group was involved in the association, it always lasted for over an hour. Interactions occurred once every seven hours. Associations mainly occurred while the Bonobos were feeding or resting. Wolf's Mona Monkey was found to feed in the trees while the Bonobo fed or rested.[6]
When forming associations with other primates it is necessary that there is a difference in diet or feeding height between the species to reduce competition. When in a mixed group, Wolf's Mona Monkey will move and forage at a mean height of 17 meters. Wolf's Mona Monkey is mainly found in association with the Red-tailed Monkey (which forages at 12 m) and the Black Crested Mangabey (which forages at 21.5 m), two species with similar diets to Wolf's Mona Monkey. These mixed groups most likely form for predator detection.[3]
[edit] Gallery
 Facial close-up |
[edit] References
- ^ a b c 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, 158. ISBN 0-801-88221-4.
- ^ Glenn, ME. (1997). "Group size and group composition of the mona monkey (Cercopithecus mona) on the island of Grenada, West Indies". American Journal of Primatology 43 (2): 167–173. doi:.
- ^ a b Mate, C. et al. (1995). "Preliminary observations on the ecology of forest cercopithecidae in the Lokofe-Ikomaloki Region (Ikela, Zaire)". Folia Primatologica 64: 196–200.
- ^ Grubb, P. et al. (2003). "Assessment of the Diversity of African Primates". International Journal of Primatology 24 (6): 1301–1357. doi:.
- ^ Buzzard, Paul J. (2006). "Cheek pouch use in relation to interspecific competition and predator risk for three guenon monkeys (Cercopithecus spp.)". Primates 47: 336–341. doi:.
- ^ Ihobe, H. (1997). "Non-antagonistic Relations Between Wild Bonobos and Two Species of Guenons". Primates 38 (4): 351–357. doi:.
