PhD Theses (SACON)

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End date: 2019Subject: search.filters.subject.Tamilnadu

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    Organochlorine pesticides, population and reproductive success of fish-eating birds in select heronries in Tamil Nadu
    (SACON, 2013) Jayakumar, S.; Murlidharan, S.
    Colonial water birds are one of the major vital components of a wetland ecosystem. They serve as an excellent indicator of wetland health. In India. destruction of fresh water wetlands and entry of contaminants pose significant threats to the long-term stability of the population of colonial water birds and their habitats. Enormous quantities of man-made chemicals are used in modern agriculture. Despite obvious benefits, their indiscriminately has resulted in accumulation of residues in food and animal tissues causing environmental and ecological impact. Presence of pesticide residues, particularly persistent organochlorines in different biological and non-biological components has raised concern about their long-term accumulation and effects. Birds occupy different trophic levels in different food chains and hence are exposed to different concentrations of contaminants through their food. III effects of pesticides on wildlife. especially raptors, waterfowl and fish-eating birds have been extensively studied around the world. But, in India such information on birds particularly fish-eating birds (colonial birds) is limited. Although. some information is available on the residue levels of pesticides present in eggs of fish-eating and insectivorous birds in lndia, they fail to bring out the exact scenario of pesticide usage in agricultural areas and residue levels in eggs, and the consequent impact on breeding outcome. Further. there are 110 studies which have repol1ed the residue levels in eggs and simultaneously monitored the population of birds over a period of time in India. The present work was conducted in select heronries in Tamil Nadu with the following objectives; identify the heronries in Tamil Nadu, monitor the population and study breeding ecology of colonial nesting birds in select locations. document the residue levels of organochlorine pesticides in fishes, eggs and tissues of colonial nesting birds and asses the impacts.
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    Breeding Biology of Olive Ridley Sea Turtle, Lepidochelys olivacea (eschcholtz, 1829) along the Poompuhar Coast, Tamilnadu, South India
    (SACON, 2011) Gokulakrishnan, J.; Bhupathy, S.
    The Olive Ridleys is the most common marine turtle found in Indian waters, and is distributed on both east and west coasts including the offshore island s. Most of the ecological works on the Olive Ridleys in India have been carried out in mass nesting beaches of Orissa. This species nests sporadically all over India, but barring a anecdotal notes, information on the ecology of this species is scanty in sporadic nesting areas. Hence, the present study was carried out to, (1) Understand the nesting habitats of Olive Ridleys along the (Poompuhar) Tranquebar- Pazhaiyar coast (2) Study the breeding biology of Olive Ridleys including offshore activities along the southeast coast. Bay of Bengal (3) Study the mortality and other anthropogenic pressure on marine turtles along the Tranquebar- Pazhaiyar coast, and (4) Conservation of Olive Ridleys along the southeast coast, Bay of Bengal. The present study was conducted along the Poompuhar coast (51 km), Bay of Bengal, Tamil Nadu from November 2004 to May 2010. Fishing and agriculture are major occupations of the local inhabitants.
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    Distribution Pattern of Amphibians in Megamalai Landscape, Western Ghats, Tamil Nadu
    (SACON, 2011) Srinivas, G.; Bhupathy, S.
    Amphibians. in particular anurans, contribute a significant proportion or the vertebrate biomass in all the terrestrial and freshwater ecosystems. They function as important predator and prey species. However, studies focusing on ecology of these taxa in Indian subcontinent arc scanty. The present study had the following objectives: (1) understand the population of amphibians in the Megamalai landsc;lpe. (2) study the distribution pattern of amphibians with respect to elevation categories and vegetation types and (3) suggest conservation measures. The present study was carried out in Megamalai Hills of Theni Forest Division. From December 2006 November 2008. In the present study. three belt transects Mavadi,. Suruli and Vellimalai were laid from hilltop to the bottom stratified at 200m interval
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    Levels of organic contaminates and select biomarkers in the birds of Gujarat and Tamil Nadu, India
    (SACON, 2009) Dhananjayan, V.; Murlidharan, S.
    There has been an ongoing concern about the presence of different types of contaminants in the environment and their ill effects on wildlife, particularly birds. While substantial information is available on such in effects on birds elsewhere in the world , very limited data exist in India, A study was initiated to document the environmental residue levels of certain persistent organic contaminants, chemicals responsible for incidences of mortality of birds and, generate information on the levels of cholinesterase in brain and blood plasma of birds. The major objectives were to understand tissue specific accumulation of contaminants, namely organochlorine pesticides (OCPs), polychlorinated biphenyls (PCBs) and polycyclic a romatic hydrocarbons (PAHs) in birds, examine the variation in accumulation pattern between sexes and feeding habits, identify normal or reference levels of biomarkers, namely acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) to explain mortality of birds. Two representative cities, namely Ahmedabad, Gujarat in the west and Coimbatore, Tamil Nadu in the south were selected as study locations
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    Studies on Taxonomy, Ecology, Distribution and Conservation values of Sthalavrikshas (Temple Plants) in Tamil Nadu, South India
    (SACON, 2007) Gunasekaran, K.; Balasubramanian, P.
    A review of previous studies in this field reveals that the information is found scattered. Only a handful of scholars have conducted research in Ulis field and that too based on medicinal, religious and mythological literature. Hence, a systematic study is felt as the need of the hour with the following objectives.1. To conduct taxonomic survey of s tha1avrikshas and bring out an authentic list of sthala vrikshas of Tamil Nadu. 2. To assess the ecological importance and conservation values of sthalavrikshas. 3. To document the role of traditional customs and beliefs of sthalavriksha worship in conserving the botanical resources. Tamil Nadu s tale along with union territory of Puducherry comprises the study area. Tamil Nadu (8" 5' and 13° 35' N Latitude and 76° 15' and BOO 20' E Longitude) is situated in the southern part of peninsular India. Tamil Nadu has wide range of land forms such as Coast, Plains and Ghats and is often known as the land of temples. There arc about 25,000 temples in the state.
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    Habitat utilization by Malabar Grey Hornbill at Mudumalai Wildlife Sanctuary, Western Ghats. (TH12)
    (SACON, 2002) Maheswaran, B.; Balasubramanian, P.
    Utilization of habitat resources, particularly fruit and nest trees, by an endemic bird species, Malabar Grey Hornbill (Ocyceros griseus) was studied in a tropical semi-evergreen forest and the adjoining tea/coffee plantations at Mudumalai Wildlife Sanctuary, Western Ghats. This bird species is mainly distributed in the moist forests of southern Western Ghats. Though some aspects of Malabar Grey Hornbill in an evergreen forest at Anamalai Hills have been studied during the breeding season, fruit utilization during the non-breeding season is not known. Also, the preference of this endemic hornbill for food and nest tree species is unknown. This study aimed to assess the food preferences of Malabar Grey Hornbill during breeding and non-breeding seasons, nest-tree preferences and to identify the keystone resources for the Malabar Grey Hornbill in the semi-evergreen forest.
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    IMPACT OF ENVIRONMENTAL EDUCATION AMONG THE HIGHER EDUCATION STUDENTS OF COIMBATORE DISTRICT
    (SACON, 2017) Chandran, R; Azeez, P A
    In the last couple of decades world over there is serious deliberations on the need for pro-active participation of the public, various social segments, and persons from various walks of life in conservation of the Environment and on identifying effective strategy to accomplish that. It is well recognized that conviction, at the grass root level, on the cruciality of environmental conservation is essential for wide and involved participation of public. Environmental education (EE), especially among the youngsters, to a great extent fulfills that need and facilitates educated decision-making among the public on issues related to environment. Thus, the main goal of EE is developing a world population that is aware of and concerned about the environment and its associated problems and which has the knowledge, skills, attitudes, motivation and commitment to work individually and collectively toward solutions of current problems and prevention of new ones.