The Experts below are selected from a list of 6 Experts worldwide ranked by ideXlab platform
Solomon Yirga - One of the best experts on this subject based on the ideXlab platform.
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distribution abundance and population status of Burchells Zebra equus quagga in yabello wildlife sanctuary southern ethiopia
Journal of ecology and the natural environment, 2013Co-Authors: Reta Regassa, Solomon YirgaAbstract:A study on the distribution, abundance and population status of Burchell’s Zebra (Equus quagga, Gray 1824) was carried out in the Yabello Wildlife Sanctuary, Southern Ethiopia from October, 2009 to March, 2010 including wet and dry seasons. Distance sampling line-transect counting method was used to estimate the population status. A total of 5151 individuals were estimated with a population density of 6.5 km2. The population was female biased. The sex ratio of adult male to adult female was 1.0:1.27 and adult to young ratio was 2.9:0.6. Age composition of Burchell’s Zebra comprised 78.2% adult, 13.0% sub-adult, 5.3% juvenile and 3.5% foal. Group size changed seasonally and the mean group size was 12.5. The average herd sizes of one male harem and bachelor stallion herds were 7.8 and 5.3, respectively. Distribution and vegetation utilization of the animal showed a marked preference for open grassland habitat. However, there was a seasonal change in the preference of habitat. 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 Burchell’s Zebra by reducing the grass quality in the Sanctuary. The study recommends an effective and realistic management policy to control illegal human settlement and encroachment in the sanctuary. Key words: Abundance, distribution, Equus quagga, Oromia, population size, Yabello sanctuary.
Reta Regassa - One of the best experts on this subject based on the ideXlab platform.
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distribution abundance and population status of Burchells Zebra equus quagga in yabello wildlife sanctuary southern ethiopia
Journal of ecology and the natural environment, 2013Co-Authors: Reta Regassa, Solomon YirgaAbstract:A study on the distribution, abundance and population status of Burchell’s Zebra (Equus quagga, Gray 1824) was carried out in the Yabello Wildlife Sanctuary, Southern Ethiopia from October, 2009 to March, 2010 including wet and dry seasons. Distance sampling line-transect counting method was used to estimate the population status. A total of 5151 individuals were estimated with a population density of 6.5 km2. The population was female biased. The sex ratio of adult male to adult female was 1.0:1.27 and adult to young ratio was 2.9:0.6. Age composition of Burchell’s Zebra comprised 78.2% adult, 13.0% sub-adult, 5.3% juvenile and 3.5% foal. Group size changed seasonally and the mean group size was 12.5. The average herd sizes of one male harem and bachelor stallion herds were 7.8 and 5.3, respectively. Distribution and vegetation utilization of the animal showed a marked preference for open grassland habitat. However, there was a seasonal change in the preference of habitat. 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 Burchell’s Zebra by reducing the grass quality in the Sanctuary. The study recommends an effective and realistic management policy to control illegal human settlement and encroachment in the sanctuary. Key words: Abundance, distribution, Equus quagga, Oromia, population size, Yabello sanctuary.
J Du P Bothma - One of the best experts on this subject based on the ideXlab platform.
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habitat partitioning by ungulates on a game ranch in the mopani veld
South African Journal of Wildlife Research - 24-month delayed open access, 1996Co-Authors: B Dekker, N Van Rooyen, J Du P BothmaAbstract:Large herbivores display varying degrees of habitat selectivity and thus exhibit a heterogeneous distribution. This study investigated the spatial and temporal distribution of Burchells Zebra Equus burchelli, blue wildebeest Connochaetes taurinus, eland Taurotragus oryx, gemsbok Oryx gazella, giraffe Giraffa camelopardalis, impala Aepyceros melampus, kudu Tragelaphus strepsiceros, and warthog Phacochoerus aethiopicus, on the Messina Experimental Farm. The sighting frequency of the ungulates, expressed as distance covered by vehicle, divided by the number of individuals of a species recorded, is presented for each of the plant communities in the study area. The road counts revealed that the sighting frequency of ungulate species in the different communities showed considerable variability. Correspondence analysis detected seasonal fluctuations in preference. In the warm, dry season the ungulates were widely separated in their use of the plant communities. Thirteen habitat variables that contributed to this ecological separation were identified. Preferences for plant communities, their seasonal variation and selection for specific environmental parameters, contributed to the ecological separation of ungulates on the Messina Experimental Farm.
B Dekker - One of the best experts on this subject based on the ideXlab platform.
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habitat partitioning by ungulates on a game ranch in the mopani veld
South African Journal of Wildlife Research - 24-month delayed open access, 1996Co-Authors: B Dekker, N Van Rooyen, J Du P BothmaAbstract:Large herbivores display varying degrees of habitat selectivity and thus exhibit a heterogeneous distribution. This study investigated the spatial and temporal distribution of Burchells Zebra Equus burchelli, blue wildebeest Connochaetes taurinus, eland Taurotragus oryx, gemsbok Oryx gazella, giraffe Giraffa camelopardalis, impala Aepyceros melampus, kudu Tragelaphus strepsiceros, and warthog Phacochoerus aethiopicus, on the Messina Experimental Farm. The sighting frequency of the ungulates, expressed as distance covered by vehicle, divided by the number of individuals of a species recorded, is presented for each of the plant communities in the study area. The road counts revealed that the sighting frequency of ungulate species in the different communities showed considerable variability. Correspondence analysis detected seasonal fluctuations in preference. In the warm, dry season the ungulates were widely separated in their use of the plant communities. Thirteen habitat variables that contributed to this ecological separation were identified. Preferences for plant communities, their seasonal variation and selection for specific environmental parameters, contributed to the ecological separation of ungulates on the Messina Experimental Farm.
N Van Rooyen - One of the best experts on this subject based on the ideXlab platform.
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habitat partitioning by ungulates on a game ranch in the mopani veld
South African Journal of Wildlife Research - 24-month delayed open access, 1996Co-Authors: B Dekker, N Van Rooyen, J Du P BothmaAbstract:Large herbivores display varying degrees of habitat selectivity and thus exhibit a heterogeneous distribution. This study investigated the spatial and temporal distribution of Burchells Zebra Equus burchelli, blue wildebeest Connochaetes taurinus, eland Taurotragus oryx, gemsbok Oryx gazella, giraffe Giraffa camelopardalis, impala Aepyceros melampus, kudu Tragelaphus strepsiceros, and warthog Phacochoerus aethiopicus, on the Messina Experimental Farm. The sighting frequency of the ungulates, expressed as distance covered by vehicle, divided by the number of individuals of a species recorded, is presented for each of the plant communities in the study area. The road counts revealed that the sighting frequency of ungulate species in the different communities showed considerable variability. Correspondence analysis detected seasonal fluctuations in preference. In the warm, dry season the ungulates were widely separated in their use of the plant communities. Thirteen habitat variables that contributed to this ecological separation were identified. Preferences for plant communities, their seasonal variation and selection for specific environmental parameters, contributed to the ecological separation of ungulates on the Messina Experimental Farm.
