PhD Theses (SACON)

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

Browse

Author: search.filters.author.Arun, P R

Search Results

Now showing 1 - 4 of 4
  • No Thumbnail Available
    Item
    IMPACT OF THE WIND FARM ON SELECT FAUNAL COMPONENTS OF A DRY DECIDUOUS FOREST AT HARAPANAHALLI, DAVANGERE, KARNATAKA
    (SACON, 2021) V, Anoop; Arun, P R
    A global shift from conventional energy to the more environment-friendly and pollution-free renewable energy sources is increasingly evident in recent years. However, the renewable energy sources too have its own share of impacts on environment and life forms, although to a lesser extent compared to the conventional energy resources. The major future source for energy generation in India is expected to be the wind energy. The wind turbine installation started in India in 1984, however there are very few studies on the negative effect of wind turbines on the environment. The current pace of wind energy development in India poses questions about the extent of potential impacts by the wind farms on the environment. This study focused on the impacts of wind energy production on birds, bats, and black-naped hare (Lepus nigricollis) at Harapanahalli, Karnataka with the following objectives. (1) Study the Impacts of the wind farm on birds and bats of Hyrada reserve forest (2) Study the Impacts of wind farm on Black-naped (Lepus nigricollis) hare at Hyrada reserve forest. (3) Develop GIS-based model maps using distribution range information of select faunal species to evaluate the spatial variation in the impact potential of wind farm development.
  • No Thumbnail Available
    Item
    AVIFAUNAL COMPOSITION AND DISTRIBUTION PATTERNS ALONG ELEVATIONAL GRADIENTS IN THE SUTLEJ AND YAMUNA RIVER BASINS OF HIMACHAL PRADESH AND UTTARAKHAND, WESTERN HIMALAYA, INDIA
    (SACON, 2019) Shantakumar, B; Arun, P R
    Understanding the spatial difference in species diversity is a key challenge in ecology (Gaston, 2000). The well-known spatial pattern is the latitudinal diversity gradient, where species richness peaks at tropics and declines towards the poles (Rosenzweig, 1992). The richness of species along the elevational gradients is just a microcosm of the global latitudinal gradient (Rahbek, 1995). Species richness along the latitudinal gradient is the most striking and perhaps best-documented pattern (Yu et al., 2013). The complex elevational diversity of birds has been investigated on every continent (Cavarzere & Silveira, 2012). These patterns of species distribution along elevational gradients vary across taxonomic groups. Species richness patterns along the elevational gradients generally follow three patterns; 1) the monotonic decline of species richness, 2) the hump-shaped pattern with a peak at mid-elevation and 3) increase in species richness with increasing elevation (Figure 1.1). Among these, the first two patterns are the most common ones. i.e. either decreasing richness with increasing elevation or a hump-shaped pattern, in which diversity peaks at mid-elevations (
  • No Thumbnail Available
    Item
    Reptile Communities of Agasthyamalai Hills with Emphasis on Distribution along Elevation Gradient
    (SACON, 2017) Jins, V J; Arun, P R
    Unravelling the mechanisms behind the spatial distribution of species has been a challenging endeavour for ecologists (Lomolino & Brown, 2004). Many attempts have been made to study the spatial gradients in species richness (Darwin, 1859; Wallace, 1876; Whittaker, 1960; Brown, 1971; Rahbek, 1995) which were carried out mainly to explore the underlying mechanisms of species distributions across different geographical zones. These explorations have indicated the importance of evolutionary, geographical and environmental factors in determining species distributions. Consequently, understanding species distribution patterns became a central theme in community ecology, and a prerequisite for conservation planning (Vetaas & Grytnes, 2002). The latitudinal variations in species richness is a well known distribution pattern where more species tend to occur in the tropics than in temperate zones (Brown, 1995). Comparable patterns have been found along mountain ranges as well, where the species richness tends to decrease with increasing elevations. These patterns were initially explained as a phenomenon that happens in response to the extreme climatic conditions in higher elevations similar to that in temperate zones (Stevens, 1992). In addition, patterns such as mid-elevation peaks in species richness along elevation gradients have also been reported for various taxa.
  • No Thumbnail Available
    Item
    SEASONALITY AND ABUNDANCE OF INSECTS WITH SPECIAL REFERENCE TO BUTTERFLIES (LEPIDOPTERA: RHOPALOCERA) IN A MOIST DECIDUOUS FOREST OF SIRUVANI, NILGIRI BIOSPHERE RESERVE. SOUTH INDIA
    (SACON, 2000) Arun, P R; Vijeyan, V S
    The present study describes the seasonal variations in the abundance of insect groups in a natural moist deciduous forest of Western ghats, South India. The study covers the seasonal abundance patterns of six major insect orders, namely Coleoptera, Lepidoptera, Hemiptera, Diptera, Orthoptera, and Hymenoptera and also the seasonality of 53 species of butterflies (Lepidoptera; Rhopalocera). The relationship of insect abundance with the prevailing abiotic and biotic conditions has been examined. Three major sampling methods, namely sweep sampling, knockdown sampling and light trapping were used for the general insect sampling, while transect counting method was employed for the estimation of butterfly abundance. Other methods involving direct and indirect visual estimation of insect abundance employed in the field in an experimental basis for relatively shorter durations are also described.