(Waterhouse, 1838)

(Eng) Ogilby's duiker

(Fre) Céphalophe d'Ogilby

Pending a detailed revision of the genus Cephalophus, the classification of this species should be regarded as tentative (East, 1990).

Lower Risk, near threatened (LR:nt) both as C. ogilby and as C. o. crusalbum (White-legged duiker) in Congo and Gabon.

Very little is known on the ecology of the species. Information available is reported in Kingdon (1997). Gautier-Hion & Gautier (1994) conducted a very accurate and updated survey of the species' distribution in Gabon. Status, distribution, and some information on its ecology are found in East (1990).

Known extent of occurrence

This duiker is recorded in three distinct zones close to the West African coast: from Sierra Leone to Ghana; between Nigeria, Cameroon and Bioko; in Gabon. A rough distribution map was obtained from Haltenorth & Diller (1980) and updated on the basis of the more recent and reliable country maps in East (1990) and information in Kingdon (1997). Its distribution in Gabon also takes into account Gautier-Hion & Gautier (1994). Dr. R. East revised a preliminary map (23 June '97) (Fig. 8.6.58.a).

Primarily associated to high forest (Kingdon, 1997; East, 1990).

Based on these environmental preferences, the following scores were assigned (Fig. 8.6.58.b) (8.6.58.a):

The output of the probabilistic-continuous (PC) distribution model is shown in Fig. 8.6.58.c.

The known EO is small and less than 50% of it is classified as suitable (260 685 km²). Although the low number of valid plots (15) suggests some caution in the interpretation of the Index of Accordance, a score of 46.67% nevertheless indicates low reliability for the CD model. Thus the following information should be considered with caution: the EO appears to be fragmented with more than 200 patches. When the moderately suitable areas are considered, the fragmentation is reduced, but not enough is known about this species to justify the extensive inclusion of forest mosaics into the range of this species’ environmental preferences. The LPI shows a significant large patch (42.82%) within the EO, confirmed by the comparison of the two shape indexes. Both models indicate that the part of the EO that extends across Nigeria and Cameroon is of relatively poor quality and possibly also more fragmented. The range in Gabon should be verified as it is large and of good quality and it may add significantly to the species’ survival. About 3% of the AO is protected by parks and reserves, a very small percentage when considering that it applies to forest habitat types.