ARTIODACTYLA

Artiodactyla Id code: amd218

Bovidae
Redunca redunca

(Pallas, 1767)

(Eng) Bohor reedbuck

(Fre) Redunca, nagor

Taxonomic notes

No significant taxonomic notes.

IUCN threat category

Lower Risk, conservation dependent (LR: cd).

Available information

Although specific studies on the ecology of this species are not available, information on the main aspects of the ecology of the species can be found in several authors (Estes, 1991; Haltenorth & Diller, 1977; Kingdon, 1997; Stuart & Stuart, 1997). The effects of burning on the presence of some ungulates including the bohor reedbuck were analysed in Tanzania by Moe et al. (1990). A brief account of group size and population density in a protected area of Sudan is given by Holsworth (1972). East (1988, 1990) describes status and distribution in each country in which this species occurs. The author also gives some information on its ecology, particularly habitat preferences.

Known extent of occurrence

Widely distributed from Senegal to Tanzania (Wilson & Reeder, 1993; East, 1996). A first distribution map was acquired from Estes (1991), then largely refined in accordance with the more accurate country maps in East (1988, 1990), as indicated by Dr. R. East (23 June ‘97). (Fig. 8.6.79.a)

Categorical-discrete (CD) distribution model

The species prefers grasslands within the moist savanna and forest/savanna zones, as it needs to drink daily or at least regularly (East, 1988, 1990).

Based on these environmental preferences, the following scores were assigned (Fig. 8.6.79.b) (Tab. 8.6.79.a):

Score(*)
1	Grasslands and grassland mosaics.
2	Woodlands, forest/savanna mosaics; dense bushland and thickets.
3	Forests and croplands.
(*) Scores decreased for vegetation types occurring outside a 10-km buffer around permanent water

suitable		moderately suitable		unsuitable		Total
km²	%	km²	%	km²	%	km²	%
664 521	11	3 500 073	56	2 108 108	34	6 272 702	100

Tab 8.6.79.a: Cumulative size (km²) of areas pertaining to each environmental suitability class within the Extent of Occurrence.

	Number Patches (NP)	Mean Patch Size (MPS) km²	Patch Size SD (PSSD) km²	Largest Patch Index (LPI) %	Mean Shape Index (MSI)	Area-Weighted Mean Shape Index (AWMSI)
suitable	2 749	244	1 772	1.2	1.33	5.43
moderately suitable	2 065	1 701	52 472	53.65	1.3	37.52
Total AO	1 271	3 291	88 909	72.39	1.24	30.52

Tab 8.6.79.b: Area of Occupancy fragmentation indexes.

Probabilistic-continuous (PC) distribution model

The output of the probabilistic-continuous (PC) distribution model is shown in Fig. 8.6.79.c.

Validation

% of EO in sample areas	Number of valid plots	Index of Accordance (%)
6.51	135	55.56

Tab 8.6.79.c: Categorical-discrete (CD) distribution model validation parameters.

Comments and conservation issues

In spite of the large EO, only 11% of the distribution range is classified as suitable, and this figure is well supported by the validation parameters. Nevertheless, the total AO is significantly increased by the contribution of the moderately suitable areas which include 56% of the EO. The AO appears highly fragmented with small MPS, extremely small LPI for the suitable areas and a high AWMSI for the total AO. Large unsuitable areas are found throughout the EO, as shown by the CD model, especially in Chad, Sudan and Ethiopia, and the total AO appears to be two thirds of the EO. About 10% of the total AO is included in existing protected areas, but the greater part of those areas are of moderate suitability. The species is classified as Lower Risk and is not considered to be in need of immediate conservation action.

SUITABILITY CLASS	inside	outside	Total
suitable	1.07	9.53	10.59
moderately suitable	5.50	50.30	55.80
unsuitable	2.81	30.80	33.61
Total	9.37	90.63	100

Tab 8.6.79.d: Percent of environmental suitability classes within EO (as obtained from the categorical-discrete distribution model) inside and outside the protected areas.

References

East R. (Ed.) (1988). Antelope Global Survey and Regional Action plans, Part I: East and North East Africa. IUCN/SSC Antelope Specialist Group.

East R. (Ed.) (1990). Antelopes Global Survey and Regional Action Plans. Part 3: West and Central Africa. IUCN/SSC Antelope Specialist Group.

East R. (Ed.) (1996). Antelope survey update. IUCN/SSC Antelope Specialist Group: n° 2.

Estes R.D. (1991). The Behaviour Guide to African Mammals. Including Hoofed Mammals, Carnivores, Primates. The University of California Press.

Haltenorth T., Diller H. (1980). A field guide to the mammals of Africa, including Madagascar. Collins, London.

Holsworth W.N. (1972). Reedbuck concentrations in the Dinder National Park, Sudan. E. Afr. Wildl. J.: 19, 307-308.

Kingdon J. (1997). The Kingdon field guide to African Mammals. Academic Press, London and New York: Natural World.

Moe S.R., Wegge P., Kapela E.B. (1990). The influence of man-made fires on large wild herbivores in Lake Burungi Area in Northern Tanzania. Afr. J. Ecol.: 28, 35-43.

Stuart C., Stuart T. (1997). Field guide to the larger mammals of Africa. Struik Publishers.

Wilson D.E., Reeder D.M. (Eds) (1993). Mammal Species of the World: A Taxonomic and Geographic Reference. Second edition. Smithsonian Institution Press, Washington D.C.