PhD Theses (SACON)
Permanent URI for this collectionhttp://192.168.202.180:4000/handle/123456789/138
Browse
2 results
Search Results
Item Levels of metal contamination in various species of birds in select states in India.(SACON, 2019) Kirubhanandhini, V.; Murlidharan, S.In India, studies on metal contamination on birds are a few. There is a growing concern to examine metal contamination in birds and interpret their levels; thereby appropriate measures may be taken to conserve the species. Metal levels in tissues can serve as an indication of the potential effects for alerting managers and the public to mitigating ecological problems. The presence of metal contaminants in tissues of birds is a problem that has not been fully resolved, given the ethical and legal impediments associated with the hunting and killing of bird species. The use of body feathers for studying metal contamination is another possible solution to this problem, as removal of these feathers does not injure the birds. In reference of seabirds, breast feathers are especially useful for establishing spatio and temporal patterns in bird populations and for evaluating metal contamination in species that are threatened or in danger of extinction. The present study was conducted with objective to document the levels of accumulalion of metals such as Cd, Pb, Cr, Ni , Cu and Zn in different species of birds in select states of India.Item 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.