Submitted on: 07 July 2006.
Revised on: 14 September 2006.
Accepted on: 12 November 2006.
___________________JOURNAL OF ANIMAL ECOLOGY---WILEY
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Submitted on: 22 May 2005.
Revised on: 12 July 2005.
Accepted on: 01 August 2005.
___________________JOURNAL OF ANIMAL ECOLOGY---WILEY
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Submitted on: 29 September 2009.
Revised on: 13 December 2009.
Accepted on: 02 January 2010.
___________________JOURNAL OF ANIMAL ECOLOGY---WILEY
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Submitted on: 08 January 2005.
Revised on: 08 April 2005.
Accepted on: 07 May 2005.
___________________JOURNAL OF ANIMAL ECOLOGY---WILEY