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We thank the USIC facility, Karnatak University, Dharwad for their help with infra-red spectroscopy .

T.V. Ramachandra*

Energy and Wetlands Research Group,
Centre for Ecological Sciences,
Indian Institute of Science,
Bangalore 560 012, India.
Tel: 91 080 22933099/23600985/22932506/22932786
Fax: 91 080 23601428/23600085/23500683
E-mail: cestvr@ces.iisc.ernet.in
*Corresponding author

N. Ahalya Energy and Wetlands Research Group,
Centre for Ecological Sciences,
Indian Institute of Science,
Bangalore 560 012, India.
Tel: 91 080 23600985/22932506
Fax: 91-08023601428
E-mail: Ahalya@ces.iisc.ernet.in
R.D. Kanamadi Department of Zoology,
Karnataka University, Dharwad, India.
Tel: 91 836 2215225 /2215355
Fax 91-836-2747884 / 2741928
E-mail: ravishankar_kanamadi@yahoo.com