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Submitted on: 02 April 2004.
Revised on: 16 June 2004.
Accepted on: 27 July 2004.
___________________HYDROBIOLOGIA---SPRINGER
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Submitted on: 26 July 2009.
Revised on: 09 November 2009.
Accepted on: 26 December 2009.
___________________HYDROBIOLOGIA---SPRINGER
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Submitted on: 22 May 2002.
Revised on: 10 July 2002.
Accepted on: 22 August 2002.
___________________HYDROBIOLOGIA---SPRINGER
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