PhD Theses (WII)

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    Species diversity and molecular study of bees (Bombus and Xylocopa) in Dehradun District, Uttarakhand, India
    (wildlife Institute of India, Dehradun, 2025) Abha Purohit
    Pollinators are fundamental to the functioning of terrestrial ecosystems, as they facilitate the reproduction of a vast majority of flowering plants and thereby sustain biodiversity and ecological stability. Globally, an estimated 87.5% of flowering plants depend onanimal pollinators for successful reproduction (Ollerton et.al. 2011). In addition to their ecological role, pollinators, particularly bees, are indispensable for global agriculture. Approximately 75% of the world’s leading food crops rely on pollination to enhance both yield and quality (Klein et.al. 2007). Agricultural commodities such as fruits, vegetables, nuts, oilseeds, and spices are especially dependent on bee-mediated pollination. Beyond agricultural productivity, pollinators provide critical services that directly influence human nutrition. By increasing the diversity, availability, and quality of nutrient-rich foods, they indirectly contribute to balanced diets enriched with vitamins, antioxidants, and essential micronutrients (Eilers et.al.2011). Thus, pollinators not only underpin biodiversity but also strengthen food security and human well-being, highlighting their ecological, agricultural, and nutritional significance. 2. Research objectives The study aims to conduct a systematic survey of Bombus (bumblebees) and Xylocopa (carpenter bees) in the Dehradun district, focusing on their taxonomy, ecology, and seasonal distribution in different habitat zones. It also seeks for identification and characterization of their habitats, with emphasis on the availability of food plants that sustain high species diversity. Molecular tools, including DNA barcoding, was applied for accurate identification of collected specimens. Additionally, the research evaluated the impact of anthropogenic pressures and other environmental threats on the survival and diversity of these pollinator groups in the study area.
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    Study on distribution and relative abundance of large mammals and impact of human disturbance in and arond Mehao Wildlife Sanctuary, Arunachal Pradesh
    (Wildlife Institute of India, Dehradun, 2023) Ahmed, Arif; Gopi, G.V.
    The current study was started to gather baseline data on a few ecological factors (Diversity, distribution, relative abundance, Activity pattern and habitat preference) of selected large animals in Mehao WS. Northeast India. The study period was November 2017 to 2020. The objectives of the study are 1. To estimate the relative abundance and occupancy of selected large mammals in and around Mehao wildlife sanctuary. 2. To develop Habitat suitability model for selected large mammals in and around Mehao WS 3. To analyse the land use/land cover change pattern and to identify the main driving factors.
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    Status and ecology of leopard (Panthera pardus) in relation to prey abundance, land use patterns and conflict with human in Garhwal Himalaya.
    (Wildlife Institute of India, Dehradun, 2007) Chauhan, Devendra S.; Goyal, S.P.
    The problem of human-leopard conflict has recently been increased in the Indian Himalayan region due to change in land-use patterns. Leopard-human conflict as predation on human and livestock has been quite frequent in 16 districts of Uttarakhand state and Pauri Garhwal district is worst affected. Recent increase in such incidences has been reported from this region. The main goal of this research was to provide a base line information on status of leopard-human conflicts in Pauri Garhwal district and response of leopard in relation to prey abundance, land use patterns and human dimension in human dominated landscape. Present study was undertaken in Pauri Garhwal district of Uttarakhand to (i) determine distribution and current status of leopard in Pauri Garhwal (ii) to determine extent and severity of leopard-human conflict problems in relation to its ecological requirements, land use patterns and human life style. (iii) to study food habits in relation to prey abundance (wild and domestic) and habitat characteristics and (iv) to determine factor responsible for leopard-man conflict. A survey was carried from February 2000 to October 2001 in 15 administrative blocks of Pauri Garhwal district. Information was collected on distribution and extent and severity of leopard-human conflict.