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《Current Zoology》 2010年06期
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Demography and dynamics of mountain nyala Tragelaphus buxtoni in the Bale Mountains National Park,Ethiopia

Yosef MAMO  Michelle A.PINARD  Afework BEKELE  
【摘要】:正 We studied the population dynamics of endangered mountain nyala Tragelaphus buxtoni between 2003-2005 in theBale Mountains National Park. Line-transect sampling and total count methods were used to gather data on demographics andmovement patterns. The population's age-group composition was 58% adults, 25% sub-adults, 9% juveniles, 5% calves and 3%unidentified with a female-male sex ratio of 2:1. Population density was found to be significantly different between the twosub-populations (Dinsho Sanctuary and Gaysay/Adelay). A significant difference was found for age-group composition across thetwo sub-populations except adult females, sub-adult males and calves. The Dinsho sub-population was an isolated group. Separationand containment of the mountain nyala population could have negatively affected their ability to search for habitat requirementsand mates from distant areas. The population varied between 830-908 individuals (95% CI), a reduction of 45% from earlierreports. However, the mean population density increased due to contraction of the species' habitat range. We observed a populationdecrease of 2%-5% per year over the course of our study. Many of the assessed demographic parameters did not significantly changeover the three years. This suggests that the decrease in nyala population was not due to random variations in reproduction. Anthropogenicfactors such as competition with livestock for forage, habitat encroachment and poaching by the local people might have beenpartly responsible for the depleted population in our study areas

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