Theses and Dissertations

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Author: search.filters.author.Sankar, K.Subject: search.filters.subject.Ecology

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    Ecology of striped hyena (Hyaena hyaena) in Sariska Tiger Reserve, Rajasthan
    (Wildlife Institute of India, Dehradun, 2019) Mandal, Dibyendu K.; Sankar, K.; Qureshi, Qamar
    This study was conceivedto fill gaps in our understanding of striped hyena population parameters, resource utilization and their sociality. Finally, the findings were synthesized to understand the processes shaping diverse sociality of striped hyenas across varying resources in a comparative context under the framework of RDH. The present study was undertaken in Sariska Tiger Reserve (STR), a protected area situated in the semi-arid region of North-Western India. STR is an isolated system which has a sharp boundary with human habitations.
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    Ecology of medium and small sized carnivores in Sariska Tiger Reserve, Rajasthan
    (Wildlife Institute of India, Dehradun, 2011) Gupta, Shilpi; Sankar, K.; Qureshi, Qamar
    To assess wildlife population trends, scientifically based monitoring programs must be carried out. A new generation of camera traps and the use of well developed capture-recapture models have led to an increase in the use of remote surveying and monitoring methodologies for nocturnal species. Population estimates can be done for individually identifiable cryptic nocturnal species through camera trap. The study was carried out in Sariska Tiger Reserve (STR), western Rajasthan, India, (79° 17’ to 76°34’N, 27° 5’ to 27° 33’ E) from November 2007 to June 2009. The objectives of study are (1) To estimate the abundance of medium and small sized carnivores such as striped hyena, jackal, jungle cat, civets and mongoose. (2) To study the prey availability and food habits of medium and small sized carnivores and To assess the habitat suitability for these carnivores. In this study, both capture - recapture method and Royle -Nichols (2003) approach was applied to photographic capture trap data to estimate density and abundance of nocturnal cryptic species. The results of this study presented both numerically and also in the form of habitat suitability maps for all the study species in the study area. These finding have potential to develop basis for managing areas for these medium and small sized carnivores in Sariska and other similar habitat in semi arid zone.
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    Ecology and management of savanna vegetation in Sariska Tiger Reserve, Rajasthan.
    (Wildlife Institute of India, Dehradun, 2015) Bhatt, Priyanka; Rawat, G.S.; Sankar, K.
    This study is aimed to document the role of various abiotic and biotic factors playing a vital role in the coexistence of trees and grasses. Attempts have been made to bridge the research gaps related to the structure and composition of forest vegetation, phenology diversity and regeneration patterns along the landscape. Hence, present study was initiated with a view to collect baseline data that would be helpful in monitoring the forest changes in future. It provides information about the savanna vegetation and the dynamics and also deals with the vegetation composition, species diversity, richness and other phyto- sociological parameters, Vegeation structure, composition and factors affecting the savanna vegetation in Sariska Tiger Reserve. Objectives are : 1. To study the phenology of savanna species 2. To study the aut-ecology of dominant savanna grasses and tree species of Sariska with reference to biotic and abiotic factors 3. To study the impact of invasive species and management implications: case study of Adhatoda vasica
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    Ecology of Leopard (Panthera pardus) in Sanjay Gandhi National Park Maharashtra with Special Reference to its Abundance Prey Selection and Food Habits
    (Wildlife Institute of India, Dehradun, 2015) Surve, Nikit; Sathyakumar, S.; Sankar, K.
    Though information is available on the leopard's ecology from natural habitats, very less information is available on the ecology of leopards from human-dominated habitats in India. Hence the study was conducted at Sanjay Gandhi National Park (SGNP), Mumbai where leopard was found to be the apex predator. The total area of SGNP is 104 sq.km. It is covered , by human habitations on all the sides leaving just a narrow tip on the northern side. Camera traps were deployed in a systematic manner covering the entire study area to get leopard images. Leopard density of 21.55 ± 4.6 (SE) at 95% confidence interval was calculated in the study area using Spatially Explicit Capture Recapture models. The wild prey densities were estimated inside SGNP using 'Distance sampling with the help of line transects. The , maximum density amongst ungulates was shown by chital (14.49 ± 5.2[SE]) followed by sambar (7.52 ± 1.7[SE]). Among primates, maximum density was shown by common langur (48.04 ± 8[SE]) followed by bonnet macaque (30.78 ± 12[SE]). Density for other prey species encountered on line transects like wild pig and barking deer were not estimated as they were sighted only twice on the line transects. Dog density on the periphery of SGNP was ca1culated to be 17.26 ± 0.69 (SE) using mark-recapture technique. Food habits of leopards were studied by conducting dietary analysis using leopard scat. The high density of dogs in the periphery of the National Park also reflected in the leopard's diet. Dogs alone contributed 24.46 % of the total biomass consumed in leopard's diet. Domestic prey contributed to 43% whereas wild prey contributed to 57 % of leopard's diet in terms of relative biomass consumed. The study suggests that the leopards are dependent on both wild as well as domestic prey in the study area. Leopards can coexist with humans even amidst urban environs as long as prey population (both domestic and wild) remain sufficient and their habitat is protected.