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Sclater's guenon range in Nigeria
(map from Baker & Olubode, in press) |
More About Sclater's
Guenon
Sclater’s guenon has been confirmed near the left bank of the Niger
River at 5º39'N, 6º39'E and near the right bank of Cross River at
5º22'N, 8º04'E (Oates & Anadu, 1989; Oates et al., 1992). It also occurs
in coastal freshwater swamp forest (Gadsby, 1989; Tooze, 1995) and
freshwater swamp forest located just inland from coastal mangroves
(Powell, 1995; Tooze, 1996; Baker & Olubode, in press). In a 2004
survey, the species was found as far northeast as 6º16'N, 8º11'E, in
gallery forest in a derived savanna zone (Baker & Olubode, in press).
Though now rare or absent across much of its presumed original range
because of regional habitat loss, Sclater’s guenon is still relatively
common. In one survey C. sclateri was one of the two most
frequently encountered primates (Baker & Olubode, in press). In a
community where the species is considered sacred (Lagwa, Imo State), the
population in 2005 was estimated to be 124 individuals in 15 troops;
density = 15 individuals/km2
(Baker, 2006). In another sacred site (Akpugoeze, Enugu State), a 2006
population estimate was 193 individuals in 20 troops; density = 35
individuals/km2
(Baker, 2006). This is similar to a
previous estimate for this population of 199 individuals in 12 troops
(Tooze, 1994). However, even where C. sclateri is held as sacred,
the traditional beliefs that confer protection on the monkeys are
eroding, and the habitat available to the monkeys is already small and
declining (Oates et al., 1992; Tooze, 1994). |
References
Baker, L.R. 2005. Distribution and
conservation status of the Sclater’s Guenon (Cercopithecus sclateri)
in southern Nigeria. Unpublished report to Margot Marsh Biodiversity
Foundation, Rufford Small Grants, Lincoln Park Zoo Dept. of Conservation
and Science, American Society of Primatologists, Sigma Xi, National
Science Foundation, and Stanford Bay Area Charities.
Baker, L.R. 2006. The Nigerian Guenon in southern Nigeria: Outlook good
or just hanging on? Unpublished report to CENSHARE, Minneapolis, MN.
Baker, L.R. & Olubode, O.S. In press. Correlates with the distribution
and abundance of endangered Sclater’s monkeys (Cercopithecus sclateri)
in southern Nigeria. African Journal
of Ecology (OnlineEarly, doi:10.1111/j.1365-2028.2007.00849.x).
Gadsby, E.L. 1989. Cross River Basin primate survey: Stubbs Creek Forest
Reserve. Unpublished report to Wildlife Conservation International, New
York, and Akwa Ibom State Government, Nigeria.
Kingdon, J.S. 1980. The role of visual signals and face patterns in
African forest monkeys (guenons) of the genus Cercopithecus.
Transactions of the Zoological Society of London 35: 425-475.
Oates, J.F. & Anadu, P.A. 1989. A field observation of Sclater’s Guenon
(Cercopithecus sclateri Pocock, 1904). Folia primatologica 52:
93-96.
Oates, J.F., Anadu, P.A., Gadsby, E.L. & Werre, J.L. 1992. Sclater’s
Guenon–a rare Nigerian monkey threatened by deforestation. National
Geographic Research and Exploration 8: 476-491.
Pocock, R.I. 1904. Description of a new species of spot-nosed monkey of
the genus Cercopithecus.
Proceedings of the Zoological Society of London 1: 433-436.
Powell, C.B. 1995. Wildlife Study I, Contract E-00019, Final Report.
Environmental Affairs Department, Shell Petroleum Development Company of
Nigeria, Port Harcourt, Nigeria, 77 pp.
Tooze, Z. 1994. Conservation status of Sclater’s Guenon: Akpugoeze,
Nigeria. Unpublished report to the Wildlife Conservation Society, New
York.
Tooze, Z. 1995. Update on Sclater’s Guenon Cercopithecus sclateri
in southern Nigeria. African Primates 1: 38-42.
Tooze, Z. 1996. Bridging Report LNG EIA: The Actual Status of Primates
of the Niger Delta. Unpublished report to Aquater/TSKJ, Port Harcourt,
Nigeria.
Other key references for C. sclateri:
Oates, J.F. & Baker, L.R. In press. Cercopithecus sclateri. In: The
Mammals of Africa. Vol. 2. Primates. T.M. Butynski, J. Kalina, & J.S.
Kingdon (eds). Academic Press, Amsterdam
Baker, L.R., Tooze, Z.J., and Oates, J.F. In press. Sclater’s Guenon (Cercopithecus
sclateri). In: All the World’s Primates (ed. N. Rowe). Pogonias
Press, Charlestown, RI.
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