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Submitted on: 09 March 2000.
Revised on: 10 June 2000.
Accepted on: 27 July 2000.
___________________FRESHWATER BIOLOGY---WILEY
Submitted on: 14 November 2001.
Revised on: 22 February 2002.
Accepted on: 02 April 2002.
___________________FRESHWATER BIOLOGY---WILEY
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Submitted on: 18 January 2008.
Revised on: 02 March 2008.
Accepted on: 05 April 2008.
___________________FRESHWATER BIOLOGY---WILEY