Theses and Dissertations

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    Influence of extractive disturbances on forest bird communities in Shiwalik landscape, India.
    (Wildlife Institute of India, Dehradun, 2015) Monica; Rawat, G.S.; Mohan, D.
    Frequent extraction of plant biomass in the form of timber, firewood, fodder, and non-timber forest products (NTFP) by rural populations, is the most widespread disturbances in the tropical forests. These disturbances not only alter habitat characteristics but also affect habitat use, survival and fitness of biotic communities. Birds are highly sensitive to modification in their habitat and therefore amongst the best model taxa to examine and monitor impacts of these cryptic disturbances. In order to understand the dynamics of small-scale extractive disturbances and their effects on floral and faunal community, I undertook a study in Shiwalik landscape of northern India. The objectives of research were to: 1. Identify the major causes of disturbance in three main forest type of this landscape and assess if disturbance depends on degree of protection. 2. Quantify impacts of disturbances on different layers of vegetation (tree and shrub) and examine changes in structure and composition of the habitat, if iii any. Executive Summary 3. Investigate the response of birds community and foraging guild levels to habitat degradation in different forest types during breeding and non-breeding seasons. 4. Identify indicator bird species suitable for future monitoring of small-scale extractive disturbances in this landscape. A contiguous stretch of the Shiwalik landscape between river Yamuna in the west and river Ganga in the east was selected to carry out this study.
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    Extraction of Non Timber Forest Produce from Selected Tree Species in Betul Forest division and its Impact on the Population Structure of these Species
    (Wildlife Institute of India, Dehradun, 1997) Koliyal, Anupama; Sawarkar, V.B.; Mathur, P.K.
    This study, carried out from November 1996 to May 1997 in North Betul Forest Division (NBFD), aimed to investigate the impacts of NTFP collection on the population structure of three extracted species namely, Buchanania lanzan, Emblica officinalis and Madhuca indica. Population structure, particularly the proportion of the younger recruitment classes in the extracted site, was compared to that in Satpura National Park, an ecologically similar but undisturbed area, a perfect natural 'control' site. Regeneration of all three were negligible in the harvested site when compared to that in the unharvested site. Interestingly, Timber Forest Products, viz. Tectona gran dis, Bauhinia racemosa, and Chloroxylon sweitenia, which are harvested for parts other than the fruit/seed, showed good regeneration in both sites. The second component of the study viz. the socio-economic investigation of the dependent people showed that they ranked other occupations like Forest Department jobs and agriculture above NTFP collection and realised that collection had a negative impact on the forests. It seems that it is only the want of other income generating opportunities that forces them to continue extraction. Again this offers scope for conservation measures to be implemented. Though a short study like this is limited in its scope for providing long-term solutions, it clearly demonstrates that NTFP collection, particularly of Buchanania lanzan, Emblica officinalis and Madhuca indica in dry deciduous forests of central India does have a significant impact on the forests in general and these species in particular.