Tesfay, G/Egziabher (2005) A Comparison of Population Ecology of Beisa Oryx in Awash National Park and Alledeghi Wildlife Reserve, Ethiopia. Masters thesis, Addis Ababa University.
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PDF (A Comparison of Population Ecology of Beisa Oryx in Awash National Park and Alledeghi Wildlife Reserve, Ethiopia)
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Abstract
Field study on a comparison of population ecology of Beisa oryx (Oryx beisa) was conducted eveiy month from October to March, 2005 for six months in Ulala Sala and adjacent areas in Awash National Park and for five months (November to March, 2005) in the selected study site in Alledeghi Wildlife Reserve. The result indicated that an average of 220 individual of Beisa oryx in Awash National Park and 335 individuals of Beisa oryx in the selected study site in Alledeghi Wildlife Reserve. The mean group sizes of 17.6 individuals were found in the selected study site in AWR, and 13.9 individuals were at Illala Sala and adjacent areas in Awash National Park. The difference in mean group sizes of Beisa oryx between the two study areas was not significant. However, they were found to be significant for mixed herds (P=0.008). The group structure of the animals varied with seasons in Awash National Park and the selected study site in Alledeghi Wildlife Reserve. Large herds were frequently observed during short rainy season in grassland and smaller groups during the dry season in both study sites. Variation in monthly group size did not exist in both study sites, The most cohesive herd is that of the female and her immediate young. Single males were most common at Illala Sala and its adjacent areas in Awash National Park and male-female group in the selected study site in Alledeghi Wildlife Reserve. The mean number of calves in Awash National Park and the selected study site in Alledeghi Wildlife Reserve showed significant differences between the two seasons at 0.05 level of significance (P=0.039 and P~0.014). The females during dry and wet seasons are more numerous than the males in both study sites. The animals were observed utilizing the grassland, shrub grassland and wooded grassland habitats in both seasons in both study sites, however, there was more utilization of grassland habitat (72.8% in ANP and 89.1% in Alledeghi Wildlife Reserve). Distribution of group sizes in grassland and shrub grassland habitats of the two study sites showed a high significant differences (P=0.003 and P=0.025, respectively). Grassland habitat was the best preferred habitat of Beisa oryx. The changes in the distribution of habitat preference in the two seasons showed that no significant differences. However, there was slightly significant differences in the group sizes in grassland habitat of ANP between the two seasons (P=0.047). Seasonal home range size varied in ANP. Wet season home range size (31km ) was larger than that of dty season (25km ), Minimum Convex Polygon (MCP) method was used to calculate the home range. On the average about 52.61 % of Beisa oryx daytime were spent in feeding and 36.65%) in rest i.e. standing and lying down.
| Item Type: | Thesis (Masters) |
|---|---|
| Subjects: | G Geography. Anthropology. Recreation > GE Environmental Sciences Q Science > QL Zoology |
| Divisions: | Africana |
| Depositing User: | Selom Ghislain |
| Date Deposited: | 01 Nov 2018 10:02 |
| Last Modified: | 01 Nov 2018 10:02 |
| URI: | http://thesisbank.jhia.ac.ke/id/eprint/7254 |
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