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Submitted on: 10 September 2004.
Revised on: 19 October 2004.
Accepted on: 15 December 2004.
___________________ECOLOGICAL MANAGEMENT & RESTORATION
Submitted on: 08 April 2001.
Revised on: 02 June 2001.
Accepted on: 25 July 2001.
___________________ECOLOGICAL MANAGEMENT & RESTORATION
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