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Submitted on: 14 July 2001.
Revised on: 03 August 2001.
Accepted on: 22 September 2001.
___________________AQUATIC ECOLOGY---SPRINGER
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Submitted on: 30 December 2005.
Revised on: 06 April 2006.
Accepted on: 16 May 2006.
___________________AQUATIC ECOLOGY---SPRINGER
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