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Submitted on: 09 March 2005.
Revised on: 30 April 2005.
Accepted on: 30 May 2005.
___________________BIOLOGY AND ENVIRONMENT-PROCEEDINGS OF THE ROYAL IRISH ACADEMY
Submitted on: 24 August 2006.
Revised on: 05 October 2006.
Accepted on: 27 November 2006.
___________________BIOLOGY AND ENVIRONMENT-PROCEEDINGS OF THE ROYAL IRISH ACADEMY
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