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Devendra, T. & C., M. (2010). Population and habitat of Himalayan thar (Hemitragus jemlahicus) in Langtang Himalaya, Langtang National Park (LNP), Nepal. Special issue on the occasion of 15th Wildlife Week, (2067), 37–46.
Abstract: A survey of Himalayan Thar was carried out in Langtang valley in response to the lacking of scientific information of its population status and distribution in the area. The study was carried out from Ghodatabela to Langsisa Kharka during April to June of 2003/04/2005. The area was divided into 5 survey blocks measuring 5sqkm each and study was conducted through blocks. Observed herds and individual animals were repeatedly counted and recorded. A total of 218 individuals of different age and sex Himalayan Thar were recorded during the study in 8 different herds. Three types of herds were recognized; Adult male-adult female-young (37.5%), Adult female-young (37.5%) and All adult-male (25%). Survey revealed that 50% of Thar herds were observed in 4200-4900m (Fourth block) and least (12%) were in 3700-4000m (First block), animals were not located in 3850-4200m (Third, Fifth block). Stratified random sampling was done to analyze the vegetation in their habitat and identified 26 potential plant species. The encroachment of their habitat is severe by the excessive livestock grazing and utilization for cowshed. Noticeable disturbance felt due to frequent poaching and tourist flow. The conservation of this species seems vital as it is prime prey species of Snow leopard in LNP.
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Yanushevich A.I. (1972). Mammals of Kyrgyzstan.
Abstract: A description of snow leopard, its taxonomy, distribution, habitat, number, behavior, food, reproduction, parasites, infections, and practical importance is given. In Kyrgyzstan, irbis was found in the Chatkal, Kyrgyz, Talas ridges, and Terskei Alatoo. An official annual snow leopard hunting rate ranged from 10 (1955) to 54 skins (in 1936) in 1930-s through 1950-s. 17 snow leopards were caught for the purpose of zoo-export only in 1965-1966. Its skin has no special value and is used by local people for decoration of dwellings and making collars.
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Zhirnov L.V. (1978). Rare and endangered species of the USSR.
Abstract: A description of snow leopard number, distribution, reproductive biology, death reasons, and conservation measures in the USSR, where northern and north-western border of its habitat runs, is given. The population of snow leopard in the USSR is 500 1,000 animals. In the Inner Tien Shan, 400 snow leopards were caught 1936 through 1970. The maximum of 120 skins was purchased in Pamir in 1956 1958. Population of snow leopard directly correlates with population of ibex, a fact being verified by data collected on a long-term basis. Moreover, snow leopard was for a long time considered as a harmful animal, shooting of which was encouraged by premiums and resulted in reduction of snow leopard population.
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Fox, J. L., & Nurbu, C. (1990). Hemis, a national park for snow leopards in India's Trans-Himalaya. Int.Pedigree Book of Snow Leopards, 6, 71–84.
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Miller, D. J., & Jackson, R. (1994). Livestock and Snow Leopards:making room for competing users on the Tibetian Plateau. In J.L.Fox, & D.Jizeng (Eds.), (pp. 315–328). Usa: Islt.
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Fox, J. L., Sinha, S.P., Chundawat, R.S. (1992). Activity patterns and habitat use of ibex in the Himalaya mountains of India. Journal of Mammology, 73(3), 527–534.
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Jafri, R. H., & Shah, F. (1994). The role of education and research in the conservation of snow leopard and its habitat in Northern Pakistan. In J.L.Fox, & D.Jizeng (Eds.), (pp. 273–277). Usa: Islt.
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Lutz, H., Isenbugel, E., & Lehmann, R. (1994). Retrovirus serology in snow leopards and other wild felids in European zoos. In J.L.Fox, & D.Jizeng (Eds.), (pp. 203–208). Usa: Islt.
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Poyarkov, A. D., Samoylova, G. S., & Subbotin, A. E. (2002). Evaluation of Potential Habitats of Snow Leopard (Uncia Uncia, Schreb.) In Altay-Khangay-Sayan Region and in Territory of Russian Federation: GIS Approach.. Islt: Islt.
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Ale, S., & Brown, J. (2007). The contingencies of group size and vigilance (Vol. 9).
Abstract: Background: Predation risk declines non-linearly with one's own vigilance and the vigilance of others in the group (the 'many-eyes' effect). Furthermore, as group size increases, the individual's risk of predation may decline through dilution with more potential victims, but may increase if larger groups attract more predators. These are known, respectively, as the dilution effect and the attraction effect.
Assumptions: Feeding animals use vigilance to trade-off food and safety. Net feeding rate declines linearly with vigilance.
Question: How do the many-eyes, dilution, and attraction effects interact to influence the relationship between group size and vigilance behaviour?
Mathematical methods: We use game theory and the fitness-generating function to determine the ESS level of vigilance of an individual within a group.
Predictions: Vigilance decreases with group size as a consequence of the many-eyes and dilution effects but increases with group size as a consequence of the attraction effect, when they act independent of each other. Their synergetic effects on vigilance depend upon the relative strengths of each and their interactions. Regardless, the influence of other factors on vigilance – such as encounter rate with predators, predator lethality, marginal value of energy, and value of vigilance – decline with group size.
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