Theses and Dissertations

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    Diversity and distribution of Moth Assemblages Along Altitudinal Gradient in Gangotri Landscape, India
    (Wildlife Institute of India, Dehradun, 2015) Sanyal, Abesh Kumar; Uniyal, V.P.
    This study intends to document the extent of moth assemblages that exist amongst various habitats in a typical Western Himalayan altitudinal gradient in Gangotri Landscape Area (GLA). In this study, using the elevation gradient as natural experiment, the faunal structure and diversity of the moth assemblage featuring all the major macro and micromoth families as well as relationships between moths and their biotic and abiotic environments were explored. Specific objectives of the study were: (1) Documenting and prepare taxonomic inventory of rich moth fauna of Gangotri Landscape Area; (2) To assess diversity and distribution of moth assemblages among different elevations and vegetation types of Gangotri Landscape; (3) To analyze the influence of altitude, seasons, vegetation types and anthropogenic disturbance factors on moth assemblages; (4) To investigate morphometric changes (body size and proportional body parts) in moths along altitudinal gradient. The study was conducted in Gangotri Landscape Area (GLA), a vast conservation network in the North-Western part of Uttarakhand, in district Uttarkashi. A total of 670 morphospecies belonging to 22 families and 356 genera were collected during entire sampling period from 2008-2012. This study is an important step towards better understanding of a long-neglected but diverse and charismatic herbivorous insect assemblage in Himalayan temperate altitudinal gradient.
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    Patterns of Mammalian assemblages in forested riverscape in Koyna Wildlife Sanctuary, the Northern Western Ghats, India.
    (Wildlife Institute of India, Dehradun, 2021) Jelil, Shah Nawaz; Ramesh; Hayward, Matt W.
    This study deals with understanding mammal abundance and habitat status in an altered watershed, a dammed river that now forms a part of the Koyna Wildlife Sanctuary, in the northern Western Ghats, Maharashtra, India. Study aimed to understand habitat status and mammal abundance along the stream network within upstream Koyna Reservoir, 55 years after its construction. By doing this, I aimed to understand and draw conclusions on generally how reservoirs are functioning as protected areas. This study is particularly relevant and important for the threatened and unique landscapes of the Western Ghats. A systematic conservation prioritization analysis was conducted to assess which areas within Koyna should be prioritized for effective allocation of management resources. Overall, using robust modelling approaches, the thesis reports about the present status of riparian forests and mammals using these riparian areas in Koyna Wildlife Sanctuary.
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    Diversity of spider assemblages in sacred groves of Ratnagiri, Maharashtra: Implications for conservation management in the landscape.
    (Wildlife Institute of India, Dehradun, 2016) Patil, Vinayak K.; Uniyal, V.P.; Trivedi, Mukul
    The present study was conducted in Dapoli Taluka of Ratnagiri district in maharashtra with the objectives was to comprehensively document the sacred groves in the study area because it is a high concentration sacred groves region but very little documentation has been done so far. The other objective was to explore the spider diversity in sacred groves and compare it with some other habitats in the study area. These habitats included, reserved forests, mango orchards and cashew orchards. Lastly it was sought to find out if the habitats, seasonality, disturbance etc. had any influence on the diversity and composition of spider assemblages in the study sites.
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    Diversity and rarity in avifaunal assemblages in the western Himalaya: A study of patterns and mechanisms.
    (Wildlife Institute of India, 2006) Raza, Rashid H.; Mathur, V.B.; Gaston, Kevin J.
    This study focuses on patterns of diversity and rarity in the avifaunalassemblages of the Western Himalaya. It attempts to find patterns at a regional scale using a secondary database and through field studies at landscape scales at two intensive study sites, Kedarnath area and Goriganga valley in Uttaranchal. The study adopts a macroecological approach in arriving at statistical generalizations emerging from the analyses of distribution and abundance patterns of birds along the altitudinal gradient. The study identifies key patterns of composition, species abundances and species diversity seen in the Western Himalayas and attempts to understand some of the mechanisms associated with these patterns.
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    Ecology and Migratory patterns of the Golden Mahseer, Top Putitora (Hamilton,1822), in Western Himalayas using Radio Telemetry Techniques
    (Wildlife Institute of India, Dehradun, 2023) Dhawan, Bhawana; Johnson, J.A.; Sivakumar, K.
    This work is one of the most important and iconic freshwater fish species, golden mahseer Tor putitora (Hamilton, 1822), that provides crucial insights into the assemblage structure, food and space resource of the species, habitat ecology, life-history characteristics and movement ecology of the species. This study is the detailed study of any freshwater fish species in which movement patterns in the streams have been studied using radio telemetry techniques in the Himalayan streams.
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    The Effect of Land-use Changes on Odonate Assemblages in the Central Western Ghats
    (Wildlife Institute of India, Dehradun, 2024) Gowda, H.N. Rakshit; Gautam, Ritesh; Johnson, J.A.
    Odonata, the only apex insect predator in both terrestrial and aquatic life forms, are widely used as biological indicators of the health of aquatic ecosystems across the globe. The Riparian land uses such as commercial plantations negatively impact the Odonata assemblages, causing the homogenisation of habitats with generalist species and the extinction of specialist species. These land uses affect the riparian vegetation, habitat structure, and water quality parameters, which are crucial for Odonates to complete their life cycle. To understand the impact of commercial plantations on stream-associated Odonata assemblages at the sub-order level, three treatments comprising a combination of forest and areca plantations on either bank of streams were selected. The habitat variables, such as ambient temperature and canopy cover, along with stream parameters like flow and water quality parameters such as pH and water temperature, significantly influenced the Odonate assemblages. The sub-orders, Dragonflies and Damselflies, differed in their response to altered (Areca plantations and plantation-forest edge) and preserved sites (forested sites). These outcomes highlight the importance of the dependency of Odonata on particular sets of variables and the consideration of suborders of Odonata separately as indicator groups for the quality of aquatic ecosystems.
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    Species Assemblage and Differential Basking Habitat Use of Freshwater Turtles in a Gradient of Mahanadi Riverine Ecosystem, Orissa
    (Wildlife Institute of India, Dehradun, 2009) Jani, Chandan; Choudhury, B.C.; Sivakumar, K.
    Of the seven species of turtles recorded in the Mahanadi River, this study recorded five species of freshwater turtles between Satkosia Gorge Wildlife Sanctuary and Khakadi (Near Cuttack city) during November 2008 to April 2009. Of these five species, four were softshell turtles (Nilssonia gangeticus, Nilssonia hurum, Chura indica, Lissemys punctata) and one was hardshell (Pangshura tentoria). Relative abundance in terms of mean number of individuals sighted per kilometre was estimated. The results showed that Pangshura tentoria was most abundant and was recorded over all the sampling zones, followed by Nilssonia gangetic vs Nilssonia hurum and Chitra indica. The latter three were not distributed as commonly as the former. Lissemys punctata was not included in the report as the species never sighted during the sampling secession. However, the species was found to get captured in incidental fish catch during the study period. The low abundance of Chitra indica and Nilssonia hurum might be due to degradation of their habitats. These two species are known to refer undisturbed and wider river stretches which are diminishing in the Mahanadi River. The habitats of the river stretch between Satkosia Gorge Wildlife Sanctuary and Kakhadi varied significantly and thus, explaining the variation in the species richness as well as abundance. The major habitat variables, which have highly influenced the turtle abundance were river flow, river width and river bank characteristics. Highest abundance of species was found in the non-riparian flow zones and river stretches with rocky and sandy banks, where the habitat heterogeneity was greater. These two sampling zones also experienced the least anthropogenic pressures. Choice in habitat use for basking in turtles was also observed. The choice of the habitat varied between species. Nilssonia gangetic and Nilssonia hurum preferred areas which had greater river bank width with shallow water near the bank. Chitra indica preferred areas where both river depth and river width were higher whereas bank slope, river slope, ground cover, alternative basking substrate and immediate water depth was lower. Pangshura tentoria preferred areas with greater river and bank slope along with greater availability of alternative basking substrate and greater immediate water depth. On the other hand they also preferred the habitat more close to the river with lower bank width and moderate river depth and moderate river width. Major threats to turtles in the Mahanadi river (sampling zones) are due to anthropogenic pressure and habitat degradation. Some of the threats were found to be consistent over the sampling zones. The study shows that Pangshura tentoria was highly tolerant to all prevailing threats in the Mahanadi river but, Nilssonia hurum and Chitra indica were adversely affected by these threats all along the river. This study found that there was a negative correlation between the turtle abundance and presence of threats such as sand mining, pump house, fishing and pollution. Sand mining adversely affected the basking habitat of most of the turtle species. Pump houses were largely avoided by the turtles which may be due to the vibrations or noise created at these stations. Unintentional by-catch of turtles during fishing was also observed especially in the braided flow zones and inundated static flow zones of the Mahanadi river. Sand mining and fishing are identified as the major threats to the turtles in the Mahanadi river, which should be monitored and regulated. Sand mining should not be allowed during the breeding season of the turtles especially in the area of Non riperian flow zone and braided flow zone. These two sampling zones were identified as the Important Turtles Areas (ITAs) in the Mahanadi River. Alternate livelihood options should be identified and implemented in order to reduce people's dependency on fishing in this region. Nature education and awareness programme clearly addressing the reason for declining of turtles and their habitat in the Mahanadi river needs to be launched.