PhD Theses (SACON)

Permanent URI for this collectionhttp://192.168.202.180:4000/handle/123456789/138

Browse

Filters

2011 - 20182

Settings

Author: search.filters.author.Azeez, P ASubject: search.filters.subject.India

Search Results

Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Study of the Bird Community in Agasthyamalai hills, Western Ghats, Kerala, India
    (SACON, 2018) Panigrahi, Madhumita; Azeez, P A
    patterns of occurrence or distribution and generality of the pattern (Weins 1989, Vellend 2010). A community is structured by wide array of factors, competition, niche availability, spatial heterogeneity, predation, climatic stability, productivity, dispersal, speciation and many more (Hutchinson 1959, Pianka 1966, Vellend 2010). On the other hand, distribution of species may be influenced by species composition, abundance, behaviour, morphology and their association with the environment (Weins 1989). Owing to the complexity of the systems and interactions among them, the study of community ecology is rightly stated by Schoener (1986) as the ‘most tumultuous and alluring of ecology’s subdisciplines’. Studies on avifauna have been playing a pivotal role in addressing intricate questions and testing varied hypotheses relating to community ecology. As widely noted, methodological advances, well-studied taxonomy and natural history, mostly diurnal behaviour and conspicuousness make birds an easy species to study
  • No Thumbnail Available
    Item
    Status and Ecology of House Sparrow Passer domesticus along an urban to rural gradient in Coimbatore, India
    (SACON, 2011) Dhanya, R; Azeez, P A
    In due course of the evolution of human civilisation, from their nomadic to the resident lifestyle, they were industrious agents of change. Their behaviours changed ecological processes in agglomerates of residences and trades, in cities and as well as in other areas (Vitousek et al. 1997). As the human population rise, infrastructure grows up; urbanisation spreads and increasingly affects biodiversity (Blair 2004). Human activities in the form of land use changes, urbanisation and infrastructure developments are considered major threats to biodiversity (Gontier 2008). This in turn results in the loss and fragmentation of natural habitats, thereby threatening populations of local species and ultimately biodiversity (Saunders et al. 1991). Urban development produces the greatest local extinction rates and eliminates the majority of the species (Vale and Vale 1976, Marzluff 2001, Czech et al. 2000). This replacement brings in the process of biotic Homogenisation that threatens to reduce the biological uniqueness of local ecosystems (Blair 2001). The loss and fragmentation of valuable habitats influences the long-term viability of species populations, which may ultimately become extinct at the local or regional scale