M Sc Dissertation(WII)

Permanent URI for this collectionhttp://192.168.202.180:4000/handle/123456789/3

Browse

Author: search.filters.author.Mukherjee, Shomita

Search Results

Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Assessing the distribution and density of the Fishing Cat in Bhitarkanika mangroves of eastern India by
    (Wildlife Institute of India, Dehradun, 2024) Ashik, C.S.; Mukherjee, Shomita; Gopi, G.V.; Pandav, Bivash
    Identifying the areas of occurrence, population, and the factors affecting the species distribution is critical in conservation and management. The Fishing Cat (Prionailurus viverrinus), a smaller feline native to South and Southeast Asia, is globally vulnerable and adapted to wetland habitats, with a diet primarily consisting of fish. This makes Bhitarkanika, a mangrove ecosystem, an ideal habitat for the Fishing Cat. This study was conducted to estimate the species density, determine the factors affecting its distribution, and assess the effect of lunar illumination and tidal fluctuation on Fishing Cat activity. Despite known occurrences of Fishing Cats in this area, there has been no proper assessment of their population or other ecological studies. Camera traps were deployed in 109 grids, each covering 1km², across a total of 145 km², for 2878 trap nights. Camera trap locations are unbaited, with two cameras used to capture both flanks. Spatially explicit capture-recapture (SECR) was used to estimate the density, resulting in 0.6 ± 0.1 individuals per km². The abundance was also calculated, with an estimate of 99 ± 16 individuals. These density estimates from this study are close to recent high-density estimates for the species. The canopy cover, the width of the creek, canopy cover and the distance to the aquaculture farms significantly influenced the Fishing Cat habitat use, indicating the need for the conservation of natural mangrove habitats and regulation of aquafarms present near the forest. In contrast, the presence of Saltwater Crocodile showed a negative effect on the distribution of Fishing Cats. The Fishing Cats were more active during the brighter nights of the moon phase (μ= 266.783, r= 0.051, p< 0.01) due to better visual detection. The activity was influenced both by the tidal fluctuations in terms of food resources from waterbodies and it is further enhanced by the lunar illumination during the night. Pairwise non-parametric tests showed that the probability distributions of Fishing Cat activity under lunar illumination and tide fluctuation (D= 0.125, p-value = 0.9885 and D= 0.125, p-value= 0.9899) were similar, indicating minimal differences between each probability distribution. This study underscores the importance of protecting the mangrove habitat and controlling aquaculture expansion to ensure Fishing Cat survival in the Bhitarkanika National Park.
  • No Thumbnail Available
    Item
    Ecological separation of four sympatric carnivores in Keoladeo Ghana National Park, Bharatpur, Rajasthan, India
    (Wildlife Institute of India, Dehradun, 1989) Mukherjee, Shomita; Johnsingh, A.J.T.
    The study conducted from 5th May 1989 to 9th October 1989 covering summer and monsoon looked at the ecological separation of four sympatric carnivores in Keoladeo National Park, Bharatpur, Rajasthan. The four carnivores were - Jungle cat (Felis chaus), Fishing cat (Felis viverrina), Jackal (Canis aureus) and otter (Dutra perspicillata). Objectives of the study were to determine differences in dietary composition, habitat occupancy and time of activity as well as to tryout methods for studying sympatric lesser carnivores. Five methods were tried out to obtain these Objectives. Line transects and searches during mornings and nights were used to collect data on prey abundance, location of carnivores and their tine of activity. Scats were collected and analyzed to determine dietary composition and see how they differed among jackal, fishing cat and Jungle cat. Otter spraints were not found. The following conclusions are although some amount of overlap is evident an overall difference in habitat use, time of activity and dietary composition is seen. Jackals and Jungle cats are habitat generalists but dietary specialists. "The fishing cat and otter are habitat as well as dietary specialists . Jungle cat and fishhing cat are largely nocturnal Out the Jackal and otter are active throughout the day. Behavioural observations added to the results obtained from the other methods . 100 methods however were found unsuitable for studying lesser carnivores.