Submitted on: 14 February 2006.
Revised on: 01 May 2006.
Accepted on: 19 May 2006.
___________________BIOLOGICAL CONSERVATION---ELSEVIER SCI LTD
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Submitted on: 27 July 2008.
Revised on: 14 October 2008.
Accepted on: 02 November 2008.
___________________BIOLOGICAL CONSERVATION---ELSEVIER SCI LTD
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