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 Acknowledgements

Our sincere thanks to Prof. N.Sivagnanam, Head,Dept. of Geography, Univ. of Madras, Dr. T. Vasanthakumaran, Dr.V.Madha Suresh, Department of Geography, University of Madras.Dr. S.N. Prasad, Salim Ali Centre for Ornithology and Natural History, Dehradun, Dr.V.Krishnamoorthy- National Institute of Ocean Technology, Dr. Venkatraman, Dr.Raghunathan, Dr.Thirumailai –Zoological Survey of India , Er.Jayaseelan- Tamil Nadu Pollution Control Board ,Mr.M.B.Nirmal & Mr.T.K.Ramkumar- Exnora International for providing help at all junctures. We cannot forget the moral support lent to us by our families. Finally, this study is dedicated this work to the Almighty God and to all the people who dare to do something different.