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Submitted on: 20 April 2010.
Revised on: 29 July 2010.
Accepted on: 19 September 2010.
___________________BIOLOGICAL CONSERVATION---ELSEVIER SCI LTD
Submitted on: 31 August 2010.
Revised on: 07 October 2010.
Accepted on: 19 November 2010.
___________________BIOLOGICAL CONSERVATION---ELSEVIER SCI LTD
Submitted on: 11 June 2012.
Revised on: 01 October 2012.
Accepted on: 28 October 2012.
___________________BIOLOGICAL CONSERVATION---ELSEVIER SCI LTD
Submitted on: 15 November 2013.
Revised on: 14 March 2014.
Accepted on: 31 March 2014.
___________________BIOLOGICAL CONSERVATION---ELSEVIER SCI LTD
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