Browsing by Author "Namgail, Tsewang"

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Habitat Selection and Ecological Separation between Sympatric Tibetan Argali and Blue Sheep
(2001) Namgail, Tsewang
"Summer habitat utilisation and ecological separation between the sympatric mountain ungulates Tibetan argali Ovis ammon hodgsoni and blue sheep Pseudois nayaur in Hemis High Altitude National Park, Ladakh, India were studied to determine how the two species coexist. I investigated the hypothesis that ecological separation between the blue sheep and Tibetan argali occurs on the basis of physical habitat selection. Such separation was tested for on the basis of expected difference between the species, as related to proximity to cliffs associated with the species-specific anti-predator behaviour. Tibetan argali selected habitats away from cliffs while blue sheep selected habitats close to cliffs. Blue sheep also selected steep slopes whereas argali selected gentle slopes. Slope angle was found to be more important than distance to cliff in shaping the niche relationship. The two species did not differ in their use of habitats in terms of elevation and vegetation cover. They however differed in their use of plant communities; blue sheep selected sub-shrub and grass communities whilst argali selected forb communities. The two species are ecologically separated on the basis of physical habitat (and perhaps food), and presumably do not compete for common resources."
Strategy for Conservation of the Tibetan Gazelle Procapra picticaudata in Ladakh
(2007) Bhatnagar, Yash Veer; Seth, C. M.; Takpa, J.; Ul-Haq, Saleem; Namgail, Tsewang; Bagchi, Sumanta; Mishra, Charudutt
"Tibetan gazelle Procapra picticaudata is endemic to the Tibetan plateau. During the early twentieth century, it was distributed over a range of c. 20,000 km2 in Ladakh, India. Although its conservation status is believed to be secure, our surveys initiated in 2000 found that the gazelles population in Ladakh has undergone a precipitous decline. Today, c. fifty individuals survive precariously in an area of c. 100 km2 in eastern Ladakh. Population declines have also been reported from Tibet, which remains its stronghold. Local extinction of the gazelle in Ladakh is imminent unless active population and habitat management are undertaken. Management measures, however, are stymied by the lack of understanding of the gazelles ecology and the causes for its decline. Our recent studies in Ladakh establish that past hunting, particularly in the aftermath of the Sino-Indian war in 1962, and continued disturbance and habitat degradation associated with excessive livestock grazing are the main anthropogenic factors that caused the gazelles decline. Our studies have also generated an understanding of the important biotic and abiotic habitat correlates of the gazelles distribution, and the land use and socio-economy of pastoral communities that share the gazelles range. We review these findings, and based on our research results, outline a species recovery strategy for the Tibetan gazelle."