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Submitted on: 26 November 2003.
Revised on: 11 February 2004.
Accepted on: 29 February 2004.
___________________Journal of Plant Ecology---OXFORD UNIV PRESS
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Submitted on: 13 May 2010.
Revised on: 16 July 2010.
Accepted on: 02 August 2010.
___________________Journal of Plant Ecology---OXFORD UNIV PRESS
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Submitted on: 09 October 1998.
Revised on: 19 January 1999.
Accepted on: 14 March 1999.
___________________Journal of Plant Ecology---OXFORD UNIV PRESS
Submitted on: 10 August 2007.
Revised on: 22 November 2007.
Accepted on: 03 December 2007.
___________________Journal of Plant Ecology---OXFORD UNIV PRESS
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