Aychew Melkamu, Girma Zerihun
Geralle National Park, Ethiopian Wildlife Conservation Authority Addis Ababa Ethiopia.
Department of Wildlife & Ecotourism Management Wondo Genet College of Forestry & Natural Resource Hawassa University Shshemene Ethiopia.
Ecol Evol. 2024 Jul 15;14(7):e70008. doi: 10.1002/ece3.70008. eCollection 2024 Jul.
The study was conducted to determine the population size of endangered (Rüppell, 1835), and near-threatened (Brooke, 1878) of uncertain global population estimates in Geralle National Park, southeastern Ethiopia. Systematic line transects were established with a transect length range of 2.3 to 6.8 km long (a total of 165.4 km long with a sighting distance of 150 m after truncation). The combination of AIC and chi-square -values was used as model selection criteria for density/population size estimation in distance sampling software. The lowest AIC, ∆AIC (close to zero), and Chi-square tests (-value > .05) were selected with adequate model fit. The minimum observation was 67 individuals of beisa oryx in the dry season. The maximum observation was 349 individuals of gerenuk during the wet season. The minimum detection probability of oryx was in the wet season ( = 76 ± 26), and the minimum detection probability of gerenuk was ( = 75 ± 1) in both seasons. The two-season pooled density analyzed for studied species indicated (0.85 ± 0.34, 1.24 ± 0.47, beisa oryx/km), and (3.82 ± 0.6, 4.88 ± 0.7 gerenuk/km) in dry and wet seasons, respectively. It can be concluded from the results of the study that GNP is home to previously undiscovered healthy populations of the endangered beisa oryx and near-threatened gerenuk. So it is recommended to undergo in-depth population studies, including other species available in the national park and their habitat components, so as to design sound, sustainable conservation measures for the wildlife resources in the area.
本研究旨在确定埃塞俄比亚东南部杰拉勒国家公园中濒危的（鲁佩尔，1835年）和近危的（布鲁克，1878年）种群数量，其全球种群估计情况不明。建立了系统的样线，样线长度范围为2.3至6.8千米（截断后总长度为165.4千米，观测距离为150米）。在距离抽样软件中，将AIC和卡方值的组合用作密度/种群数量估计的模型选择标准。选择最低的AIC、∆AIC（接近零）和卡方检验（-值>.05）且模型拟合良好。旱季最小观测到67只北山羊。雨季最大观测到349只长颈羚。北山羊的最小检测概率在雨季（=76±26），长颈羚在两个季节的最小检测概率均为（=75±1）。对研究物种进行的两季合并密度分析表明，旱季和雨季的北山羊分别为（0.85±0.34，1.24±0.47只/千米），长颈羚分别为（3.82±0.6，4.88±0.7只/千米）。从研究结果可以得出结论，杰拉勒国家公园是濒危的北山羊和近危的长颈羚此前未被发现的健康种群的家园。因此，建议对该地区进行深入的种群研究，包括国家公园内的其他物种及其栖息地组成部分，以便为该地区的野生动物资源设计合理、可持续的保护措施。
