Submitted on: 04 August 2011.
Revised on: 23 November 2011.
Accepted on: 09 January 2012.
___________________Fundamental and Applied Limnology
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Submitted on: 06 June 1999.
Revised on: 05 September 1999.
Accepted on: 25 September 1999.
___________________Fundamental and Applied Limnology
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Submitted on: 25 February 2006.
Revised on: 02 May 2006.
Accepted on: 27 May 2006.
___________________Fundamental and Applied Limnology
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