Theses and Dissertations

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Author: search.filters.author.Jhala, Y.V.Subject: search.filters.subject.Distribution

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    Status, distribution and foraging ecology of wolf in the north-western Himalayan landscape, India.
    (wildlife Institute of India, Dehradun, 2020) Shrotriya, Shivam; Habib, Bilal; Jhala, Y.V.
    The Himalayan wolf lineage is known to have genetic uniqueness, as it might be the oldest diverging population of the wolf-dog clad worldwide. This research commenced with the objectives of 1) understanding nature and pattern of livestock predation by the Himalayan wolf and the attitude of local communities towards them, 2) studying food habits of the Himalayan wolf at the landscape level and its diet niche overlap with sympatric carnivore species, and 3) comprehending the status, distribution pattern and factors determining the distribution of the Himalayan wolf and its prey. The study was conducted in an area of 1,41,391 km2 encompassing Leh and Kargil districts of Ladakh region and Lahaul & Spiti and Kinnaur districts of Himachal Pradesh. There are six high altitude protected areas in the districts of Leh and Lahaul & Spiti. The fieldwork for this study was conducted from 2014 to 2018. The Himalayan wolf occurs along with snow leopard as a major carnivore in the Trans-Himalayan landscape. Red fox Vulpes vulpes is another widespread carnivore of the landscape. In this research, diet patterns, niche overlap and the competition were studied by conducting scat analysis and also generates crucial information on the ecology of rare Himalayan wolf lineage
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    Distribution and demography of carnivores in some parts of semi-arid landscape of Western India.
    (wildlife Institute of India, Dehradun, 2020) Sadhu, Ayan; Jhala, Y.V.; Qureshi, Qamar
    The present study reveals long-term research on tigers, elaborating their vital rates, survival parameters, and dispersal. The camera trap data to estimate the spatially explicit density, space use, and time-activity pattern of leopards. A combination of techniques that included radio telemetry, camera traps, direct observations, and photo documentation was used to obtain 3492 observations on 97 individually known tigers in Ranthambhore between 2006-2014 to estimate demographic parameters that estimates collated over nine years from 97 individually known tigers and annual density estimates of Ranthambhore tiger population from camera traps. This study aimed to estimate the demographic parameters of Ranthambhore tigers, and subsequently compare them with other tiger populations. Two species occupancy was used to estimate the spatial co-occurrence of tiger and leopard in Ranthambhore. As a long-term conservation strategy, this semi-arid tiger population needs to be conserved in a metapopulation framework. The species distribution modelling showed the importance of the PAs and also highlighted areas to direct conservation investments outside the protected areas.
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    Assessment of landscape patterns for modeling habitat suitability for lions and prey species in Gir Protected Area, Gujarat.
    (Wildlife Institute of India, Dehradun, 2013) Basu, Parabita; Qureshi, Qamar; Jhala, Y.V.
    Conservation of ‘source’ alone may not be a sufficient strategy to ensure long term persistence of lions; rather it is enhanced by maintaining connectivity among different populations so as to permit lion movement across human-dominated areas. However, the traditional land-use patterns within Gir landscape is changing at an alarming rate mainly as a result of agricultural expansion, urbanization and industrialization. In this scenario, I attempt to (1) Examine the distribution of suitable lion habitat in Saurashtra, especially in areas outside of protected area to assess the potential of the landscape for supporting an increasing lion population, (2) Identify functional corridors joining Gir and Girnar protected area with suggested management interventions, necessary for safeguarding the corridor, (3) Evaluate the current landscape architecture of Gir PA and its surroundings (4) Assess the rate of change in land use and vegetation patterns within Gir PA, (5) Develop habitat suitability models at different spatial scales for lions and its principal prey species.
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    Occupancy and abundance of tigers and their prey in Terai Arc Landscape, Nepal.
    (Wildlife Institute of India, Dehradun, 2012) Karki, Jhamak Badur; Jhala, Y.V.; Pandav, Bivash
    The occupancy, distribution and tiger density are important information for management and conservation policy formulation. Realizing this need, this study was undertaken. The major wild prey species of tiger are spotted deer (Axis axis), wild pig (Sus scrofa), sambar (Rucervus unicolor), swamp deer (Rucervus duvaucelli duvaucelli), barking deer (Muntiacus muntjak), hog deer (Heylaphus porcinus) and gaur (Bos gaurus) in Nepal. To evaluate the occupancy of tiger in Nepal's Terai Arc landscape (TAL), sign survey was conducted in 96 grids (area 225 Km2 ) in 14 districts, including PAs. To assess correlation of the tiger occupancy with the availability of wild prey, and the human disturbance with the habitat use by the tiger, the sign of human disturbances (fire, timber cut, fuel wood collection, sign of poaching) and prey presence were recorded during the winter season. To estimate the density of tigers wild prey in PAs of Nepal's TAL, distance sampling was conducted along the predefined line transects during the summer season
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    Land, lion and locals: Understanding the distribution of lions and large carnivore human interactions in the Greater Gir Landscape of Saurashtra
    (Wildlife Institute of India, Dehradun, 2025) Gogoi, Keshab; Jhala, Y.V.
    Apart from the Gir Protected Areas, Asiatic lions inhabit various coastal forest patches in Mangrol, Veraval, Kodinar, Mahua, and Rajula-Jafrabad areas. They also reside in Girnar Wildlife Sanctuary (WLS) and within human-dominated landscapes across Amreli, Junagadh, and Bhavnagar districts (Mitiyala WLS), as well as along the Shetrunji river, Hipavadli, Palitana, and Shihor. However, the presence of extensive townships, linear infrastructure, and urban development has led to the fragmentation of lion populations. This fragmentation restricts the efficient exchange of individuals across the matrix of multi-use human-dominated landscapes. Historical corridors that once connected hills, forests, and lion habitats, including protected and un-classed forests, have largely succumbed to agriculture and human settlements. To address this pressing issue, it is crucial to identify and conserve existing habitat corridors that connect these lion patches. Failure to do so could exacerbate repropuctive isolation, leading to genetic bottlenecks and reduced genetic diversity within lion populations. To tackle this challenge effectively, I utilized Circuitscape theory to model connectivity among habitat patches in the Saurashtra landscape at a scale of 1km². Additionally, I employed least-cost pathway tools to determine the shortest pathways with the least total costs. My analysis revealed varying levels of permeability among different lion habitats. For instance, the permeability between the coastal forests of Veraval-Sutrapada and Rajula with Gir PA was found to be high. Similarly, coastal patches around Mahua taluka exhibited high permeability with forest patches around Palitana. However, the permeability between Girnar and Gir Forest was moderate, indicating the need for interventions to maintain suitable lion movement. In the eastern part of the Gir protected area, there is notable connectivity between Mitiyala Wildlife Sanctuary and Gir, as well as other habitat patches along the Shetrunjay river. By prioritizing the identification and conservation of these critical habitat corridors, we can enhance connectivity among lion populations, mitigate the risk of genetic isolation, and safeguard the long-term survival of Asiatic lions in the Saurashtra landscape
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    Resource partitioning of non-pantherine carnivore community in Kanha Tiger Reserve, M.P., India.
    (Wildlife Institute of India, Dehradun, 2022) Pradhan, Anup Kumar; Jhala, Y.V.; Qureshi, Qamar
    Carnivores of all groups have unequivocal role in structuring and functioning of their ecosystems. Hence their existence need to be secured to maintain functional ecosystems. In the current scenario of rapid industrial growth and economic development, pressure on natural resources is escalating, which in turn has jeopardized the survival of important species. Hence, to maintain harmony between economic growth and ecological balance, an effective wildlife conservation and management plan should be a priority. The Kanha Tiger Reserve (KTR), spreading over an area of around 2100 km2 located in the central Indian highlands, has immense ecological significance as it supports a wide variety of flora and fauna. The tiger reserve is home to carnivores, including tiger, leopard, dhole, sloth bear, and many small cats. However, there are several conservation challenges exists for the persistence of this ecosystem. A thorough understanding of the ecosystem and its inclusive components is a prerequisite for developing and implementing an effective wildlife conservation plan. And in the case of KTR, despite several pioneer studies, the existing research gap on the ecology of small and meso-carnivores undermines the understanding of the complete ecological functioning. To fill this research gap, I undertook this study focusing on distribution, habitat use and preference of small and meso-carnivores in KTR. I aimed to study the distribution pattern and abundance of non-pantherine carnivores (Sloth Bear, Wild Dog, Jackal and jungle cat) and their niche separation by developing a species distribution and habitat suitability map. I performed camera trapping exercises during three successive seasons in 2014, 2015, and 2016 successively in all the available habitat types to obtain information on the abundance and distribution pattern of the targeted species. The camera traps were placed in a two sq km grid-based manner. I used data from transect surveys, remote sensing techniques and published literature to obtain other ecological variables. I used presence software to run the occupancy model for each focal species separately, considering relevant environmental variables. Similarly, I used the Maxent software to prepare the habitat suitability map for each species individually. I used the kernel density approach in R software to analyze the activity overlaps between these studied species. As a result of occupancy analysis, tiger, leopard, sloth bear, and jungle cats were observed to be inhabited in the cores area of the tiger reserve and associated with dense forest cover, grasslands, and prey abundance. However, dholes preferred the fringe area of the forest, associated negatively with densities of tigers, leopard, and their preferred area, i.e., the core of the forest and positively with the grasslands. In addition, variables such as distance from human settlements, terrain ruggedness, and NDVI also affected the occupancy of these study species in the KTR. Jackal did not follow any particular pattern rather it observed throughout the forest area. Aligning with the occupancy result, the habitat suitability maps prepared by the Maxent model strengthened the observation of the spatial ecology of these carnivore groups in the KTR. The Maxent model showed that the large carnivores at the ecosystem's apex position preferred to live in the core area of the forest with abundant prey and least human interference. However, second and third order carnivores such as dholes, preferred to live outside the core to avoid possible strife with the dominant tiger and leopard. The habitat selection by these meso carnivores also indicates the dominancy iii of the large carnivores in occupying the central position and their influence in the placement of the subordinate group of carnivores in a common ecosystem. We did not observe any effect of tiger and leopard on the habitat preference of sloth bear and jungle cat which indicated the difference in the dietary pattern also play significant role in occurrence of these sympatric carnivores in a multi-predator ecosystem. Tigers and leopards were primarily crepuscular and nocturnal. Despite high activity overlap, their activity peaks were different from each other. Dholes and jackals were active during the day, whereas Sloth bears and jungle cats were nocturnal. The results of temporal interaction among these carnivores were not completely diverged from the pattern of spatial interactions observed earlier. Instead, these results strengthen the findings of the spatial interaction among these carnivores in the KTR. As observed earlier, dholes and jackals shift their activity to avoid possible conflict and become diurnal. In contrast, the activity pattern of tigers and leopards did not influence the activity pattern of sloth bears and jungle cats. The study provides information on the spatiotemporal interactions of a carnivore community in a multi-predator ecosystem in central India. The findings strengthen the earlier understanding of the ecology of large-bodied carnivores such as tigers and leopards. At the same time, it enhances the knowledge of their counterpart i.e. the lesser studies small and meso- carnivores of KTR. Large-bodied carnivores occupied the central and apex position of the ecosystem and regulated the distribution pattern of the meso-carnivores present in their ecosystem. However, species with a different ecological niche were less influenced by these apex predators.