Department of Zoology.

This is to certify that this is an authentic record of the research work carried out by Mrs.Thanuja A. Mathew, M.Sc., M.Phil., from September 2004 to September 2008 as a full-time student in partial fulfilment of the requirements for the Degree of DOCTOR OF PHILOSOPHY in the Faculty of Science of the University of Calicut under my supervision and guidance. No part of this thesis has been presented before for any other degree. I also certify that she has passed the M.Phil Degree examination of the University of Kerala in 1997 and has registered for Ph.D under M.Phil./Ph.D Integrated course of Calicut University in 2004.

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