Cercopithecus nictitans

Geographic Range

Cercopithecus nictitans occupies a variety of dense forest habitats in western and central Africa, ranging from Guinea in the west to the Democratic Republic of the Congo in the east. Populations are found in Guinea, Liberia, Ivory Coast, Nigeria, Cameroon, Equatorial Guinea, Gabon, Central African Republic, Congo, and the Democratic Republic of the Congo.

• Biogeographic Regions
• ethiopian ethiopian
  • native native

Habitat

Cercopithecus nictitans is found in the moist tropical lowland and montane forests, tropical swamp and mangrove forests, and dense gallery forests of west and central Africa. Activity is mostly confined to the main canopy layer due to their robust size. They descend voluntarily to the ground only rarely.

• Habitat Regions
• tropical tropical
• terrestrial terrestrial

• Terrestrial Biomes
• forest forest
• rainforest rainforest

• Wetlands
• swamp swamp

Physical Description

Cercopithecus nictitans , also known as white-nosed guenons, greater spot-nosed monkeys, greater white-nosed monkeys, or putty-nosed monkeys, is most easily recognized by a distinctive white spot covering the nose. Their fur is dark, ranging in color from olive to black, and sometimes have a white patch on the breast. They have cheek pouches in which to store food while foraging. Individuals weigh, on average, between 4.2 and 6.6 kilograms, making them one of the largest of the Cercopithecus group. Sexual dimorphism is evident, with males exhibiting a greater length and body mass than females. They are diurnal and, like all guenons, possess trichromatic vision. Greater spot-nosed monkeys are primarily arboreal, but also move through the forest quadrupedally. Grubb et al. (2003) recognized two subspecies, C. nictitans nictitans and C. nictitans martini , based on geographic range. Cercopithecus nictitans nictitans occupies the eastern section of the range, from Cameroon to the Democratic Republic of the Congo. Cercopithecus nictitans martini is thought to represent the western populations of several distinct subspecies, such as one on the island of Bioko.

• Other Physical Features
• endothermic endothermic
• heterothermic heterothermic
• bilateral symmetry bilateral symmetry

• Sexual Dimorphism
• male larger

Reproduction

Greater spot-nosed monkeys have a polygynous mating system, in which one resident adult male resides with several adult females and their offspring. The lone male has exclusive breeding access to all of the females. Male tenures of 5 years are common. Females solicit copulation by presenting their estrous swellings to males. During copulation, the females look over their shoulders and pout, with the lower lip pushed forward and down. Greater spot-nosed monkeys exhibit female philopatry, in which males disperse from natal groups upon adolescence and females stay in their natal range.

• Mating System
• polygynous polygynous

Females reach maturity around 4 years of age. Once pregnant, they gestate for 172 days on average. They give birth to one offspring approximately every two years. There is little information available on the reproductive cycle, breeding season, and parental investment of greater spot-nosed monkeys. However, it is assumed that, like other Cercopithecus species, the young are relatively well-developed at birth and that mothers will invest in their own offspring for approximately six months.

• Key Reproductive Features
• iteroparous iteroparous
• year-round breeding year-round breeding
• gonochoric/gonochoristic/dioecious (sexes separate)
• sexual sexual
• fertilization fertilization
• viviparous viviparous

There is little information regarding the level of parental investment in Cercopithecus nictitans , although females certainly invest heavily in offspring through gestation, lactation, and juvenile protection.

• Parental Investment
• precocial precocial
• female parental care female parental care
• pre-fertilization
  • provisioning
  • protecting
    • female
• pre-hatching/birth
  • provisioning
    • female
  • protecting
    • female
• pre-weaning/fledging
  • provisioning
    • female
  • protecting
    • female

Lifespan/Longevity

Longevity in the wild has not been recorded, but like other Cercopithecus species, greater spot-nosed monkeys probably live for approximately 20 years.

Behavior

Greater spot-nosed monkeys are generally social, found in groups of between 12 and 30 animals. There is evidence of intra-group competition for alpha male status. They are primarily active in the middle tree canopy, and frequently exhibit acrobatic movements such as leaping and darting. Their habitat overlaps with that of Diana monkeys, Cercopithecus diana . It is thought that the two species form mixed-species groups for the purpose of predation defense and shared foraging opportunities.

• Key Behaviors
• arboreal arboreal
• scansorial
• diurnal diurnal
• motile motile
• sedentary sedentary
• social social

Home Range

The exact home range of Cercopithecus nictitans is unknown, but it may be similar to that of Cercopithecus diana , which has a territory size of between 0.5 and 1 square kilometer.

Communication and Perception

Auditory, olfactory, visual, and tactile senses are complex, as in most primates. Greater spot-nosed monkeys are especially known for their wide range of vocalizations, which vary from deep booms to chirps, depending on context. Males perform loud, low-frequency boom calls to communicate territoriality and as a predator alarm call. Females and subadults often use short chirps to attract the attention of the group. Loud isolation calls are emitted both by infants and members of the group that have become separated from the troop. Olfactory communication includes mutual genital sniffing and muzzle sniffing, both of which are performed by males. Visual signals include staring, which is often accompanied by head-bobbing in order to indicate a threat display among males. Grimacing or yawning with the canines exposed is an expression of tension or a threat display.

• Communication Channels
• visual visual
• tactile tactile
• acoustic acoustic

• Perception Channels
• visual visual
• tactile tactile
• acoustic acoustic
• chemical chemical

Food Habits

Greater spot-nosed monkeys are primarily frugivorous and granivorous. Like most Old World Monkeys, they have cheek pouches in which to store seeds while foraging. They supplement their diets of fruits and seeds with leaves and insects, and occasionally agricultural crops.

• Primary Diet
• herbivore herbivore
  • frugivore frugivore
  • granivore granivore

• Animal Foods
• insects

• Plant Foods
• leaves
• seeds, grains, and nuts
• fruit
• flowers

Predation

Male Cercopithecus nictitans sound resonating alarm calls to warn the group of predators and enemies. Their dark coloring also acts as camouflage within the dark tree canopy, allowing them to hide from predators, such as leopards, crowned eagles, and humans.

• Anti-predator Adaptations
• cryptic cryptic

Ecosystem Roles

Like many other frugivorous Old World monkeys, Cercopithecus nictitans likely plays a large role in seed dispersal, as they often ingest fruits and seeds away from the parent site. Cercopithecus nictitans has been reported to live in mixed-species groups with Cercopithecus diana for mutual predator defense and increased foraging opportunities. Humans ( Homo sapiens ) hunt them for bushmeat, and also to prevent the greater spot-nosed monkeys from destroying their crops. Greater spot-nosed monkeys carry a variety of parasites, including a primate-specific strain of malaria ( Plasmodium falciparum ).

• Ecosystem Impact
• disperses seeds

Economic Importance for Humans: Positive

Cercopithecus nictitans is hunted and eaten by humans. They may positively impact forest diversity through seed dispersal.

• Positive Impacts
• food food

Economic Importance for Humans: Negative

Greater spot-nosed monkeys, like other guenons, have been reported to feed on agricultural crops.

• Negative Impacts
• crop pest

Conservation Status

Greater spot-nosed monkeys are threatened by habitat loss through deforestation and by hunting for meat, especially in the western portion of its range. On the island of Bioko, populations of C. nictitans martini have undergone steep declines, exceeding 50% during the period of 1986 to 2006.

Populations are known to occur in several protected national parks in Equatorial Guinea and Cameroon. They are listed on Appendix II of CITES and on Class B of the African Convention on the Conservation of Nature and Natural Resources.

Cercopithecus nictitans nictitans is currently listed as Least Concern by the IUCN due to its widespread range and relatively slow rate of population decline. Cercopithecus nictitans martini is classified as vulnerable due to restricted habitat range, ongoing habitat loss, and hunting pressure.

Other Comments

The taxonomy of Cercopithecus nictitans is contentious. Grubb et al. (2003) list two subspecies, the geographically widespread C. nictitans nictitans and the more restricted C. nictitans martini , but an isolated population of the latter is thought to represent a distinct and possibly threatened subspecies. A recent morphometric analysis (Cardini & Elton, 2008) misclassified Cercopithecus diana within the Cercopithecus mitis species group, which includes Cercopithecus nictitans , Cercopithecus albogularis , and Cercopithecus mitis . The inclusion of Cercopithecus nictitans within the Cercopithecus mitis species group was confirmed by a recent molecular analysis (Tosi et al., 2005), which supports Cercopithecus albogularis as the sister taxon of C. nictitans .

Cercopithecus nictitans is colloquially known as the “cowardly monkey” because of its high frequency and range of alarm calls.

Additional Links

Encyclopedia of Life

Contributors

Alexandra Neinast (author), Yale University, Eric Sargis (editor), Yale University, Tanya Dewey (editor), University of Michigan-Ann Arbor.

References

Arnold, K., K. Zuberbuehler. 2008. Meaningful call combinations in a non-human primate. Current Biology , 18: 202-203.

Bitty, E., W. McGraw. 2007. Locomotion and Habitat Use of Stampflii's Putty-Nosed Monkey (Cercopithecus nictitans stampflii) in the Tai National Park, Ivory Coast. American Journal of Physical Anthropology , 134: 383-391.

Boinski, S., P. Garber. 2000. On the Move: How and why Animals Travel in Groups . Chicago: University of Chicago Press.

Cardini, A., S. Elton. 2008. Variation in guenon skulls (I): species divergence, ecological and genetic differences. Journal of Human Evolution , 54: 615-637.

Chapman, C., L. Chapman, M. Cords, J. Gathua, A. Gautier-Hion, J. Lambert, K. Rode, C. Tutin, L. White. 2002. K., Tutin, C. E. G., and White, L. J. T. 2002. Variation in the diets of Cercopithecus species: Differences within forests, among forests and across species. Pp. 325-350 in The Guenons: Diversity and Adaptation in African Monkeys . New York: Kluwer Academic Publishers.

Cords, M. 1987. Mixed-species association of Cercopithecus monkeys in the Kakamega Forest, Kenya. University of California Publications in Zoology , 117: 1-109.

Eckardt, W., K. Zuberbuehler. 2004. Cooperation and competition in two forest monkeys. Behavioral Ecology , 15: 400-411.

Estes, R. 1991. The Behavior Guide to African Mammals . Berkeley, California: University of California Press.

Flannery, S. 2007. "Greater White-nosed Monkey (Cercopithecus nictitans)" (On-line). The Primata. Accessed March 27, 2012 at http://www.theprimata.com/cercopithecus_nictitans.html .

Gautier, J., A. Gautier. 1977. Communication in old world monkeys. Pp. 890-964 in How Animals Communicate . Bloomington: Indiana University Press.

Grubb, P., T. Butynski, J. Oates, S. Bearder, T. Disotell, C. Groves, T. Struhsaker. 2003. Assessment of the diversity of African primates. International Journal of Primatology , 24: 1301-1357.

Hearn, G., W. Morra, T. Butynski. 2006. Monkeys In Trouble: The Rapidly Deteriorating Conservation Status Of The Monkeys On Bioko Island, Equatorial Guinea . Bioko, Equatorial Guinea: Bioko Biodiversity Protection Program (BBPP).

Jeffery, K., F. Maisels, T. Barbry. 2009. Cercopithecus nictitans prey on air-borne termites in Gabon, Central Africa. African Journal of Ecology , 48: 563-565.

Kennedy, K. 1999. "Cercopithecus diana" (On-line). Animal Diversity Web. Accessed March 28, 2012 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Cercopithecus_diana.html .

Kingdon, J. 1997. The Kingdon Field Guide to African Mammals . London: Academic Press.

Kingdon, J. 1988. What are face patterns and do they contribute to reproductive isolation in guenons?. Pp. 227-245 in A Primate Radiation: Evolutionary Biology of the African Guenons . Cambridge: Cambridge University Press.

Macdonald, D. 2001. The New Encyclopedia of Mammals . Oxford: Oxford University Press.

Manaster, B. 1979. Locomotor adaptations within the Cercopithecus genus: a multivariate approach. American Journal of Physical Anthropology , 50: 169-182.

Nowak, R. 1999. Walker's Mammals of the World. Sixth Edition . Baltimore and London: Johns Hopkins University Press.

Oates, J., C. Groves. 2011. "Cercopithecus nictitans" (On-line). IUCN Red List of Endangered Species. Accessed March 28, 2012 at http://www.iucnredlist.org/apps/redlist/details/4224/0 .

Pourrut, X., J. Diffo, R. Somo, C. Bilong Bilong, E. Delaporte, M. LeBreton, J. Gonzalez. 2011. Prevalence of gastrointestinal parasites in primate bushmeat and pets in Cameroon. Veterinary Parasitology , 175: 187-191.

Prugnolle, F., B. Ollomo, P. Durand, E. Yalcindag, C. Arnathau, E. Elguero, A. Berry, X. Pourrot, J. Gonzalez, D. Nkoghe, J. Akiana, D. Verrier, E. Leroy, F. Ayala, F. Renaud. 2011. African monkeys are infected by Plasmodium falciparum nonhuman primate-specific strains. Proceedings of the National Academy of Sciences , 108: 11948–11953.

Rollinson, J., R. Martin. 1981. Comparative aspects of primate locomotion, with special reference to arboreal cercopithecines. Symposia of the Zoological Society of London , 48: 377-427.

Sumner, P., J. Mollon. 2000. Catarrhine photopigments are optimized for detecting targets against a foliage background. The Journal of Experimental Biology , 203: 1963-1986.

Tosi, A., K. Detwiler, T. Disotell. 2005. X-chromosomal window into the evolutionary history of the guenons (Primates: Cercopithecini). Molecular Phylogenetics and Evolution , 36: 58-66.

Zuberbuehler, K. 2002. A syntactic rule in forest monkey communication. Animal Behaviour , 63: 293-299.

de Magalhaes, J., J. Costa. 2009. "AnAge entry for Cercopithecus nictitans" (On-line). The Animal Ageing and Longevity Database. Accessed March 29, 2012 at http://genomics.senescence.info/species/entry.php?species=Cercopithecus_nictitans .