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Title: DISTRIBUTION, POPULATION STATUS AND FEEDING BEHAVIOR OF ORIBI (Ourebia ourebi) IN SENKELLE SWAYNE’S HARTEBEEST SANCTUARY (SSHS)
Authors: WONDIMAGEGNEHU, TEKALIGN
Keywords: Oribi
population status
activity pattern
SSHS
Date Added: 4-Sep-2007
Abstract: Population status, structure and feeding behavior of Oribi (Ourebia ourebi) was conducted in Senkelle Swayne’s Hartebeest Sanctuary (SSHS) from August 2005 to March 2006, which included wet and dry seasons. Total count method was used to determine the current population status, seasonal distribution, habitat association, and sex and age structure of Oribi. Direct observation on selected animal groups was made to study activity patterns. Data on seasonal variation in population size, habitat association and activity pattern was analyzed using SPSS (Statistical Package for Social Sciences) computer software package and compared using one-way analysis of variance (ANOVA). The estimated population of Oribi in the study area was 51 individuals. The population was female biased. The sex ratio of adult males to females was 1.00: 1.26. Oribi were mostly observed as solitary, or in pairs occasionally they form small groups, a male and one or more females and their offspring. They were often associated with Swayne’s hartebeest and sometimes fed among domestic livestock for protection. The oribi distribution showed preference to very high utilization for short grass in each vegetation communities. They were observed primarily as grazers on short grasses in both seasons. Themeda triandra was a highly preferable grass by Oribi in the study area. The distribution of Oribi during the wet and dry seasons showed slight variation on the study area in all vegetation communities. However, the tendency of population distribution towards Pennisetum grassland vegetation community increased during both seasons. The group size varied with food abundance and quality. They were mostly active during the early morning and late afternoon. The annual mean proportion of daylight hours spent feeding by Oribi was 54.7%. Morning and evening activity peaks were most obvious during the dry season, with most animals remaining inactive during the midday and hottest hours of the day. Increase in human and livestock population was observed in the study area. Overgrazing by cattle and encroachment are the primary factors that affect the population status of Oribi by deteriorating the grass quality.
Description: A THESIS SUBMITTED TO THE SCHOOL OF GRADUATE STUDIES OF THE ADDIS ABABA UNIVERSITY IN PARTIAL FULFILLMENT OF THE REQUIRMENTS FOR THE DEGREE OF MASTER OF SCIENCE IN BIOLOGY (ECOLOGICAL AND SYSTEMATIC ZOOLOGY)
URI: http://hdl.handle.net/123456789/70
Appears in:Thesis - Biology

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