Submitted on: 02 October 2002.
Revised on: 11 November 2002.
Accepted on: 26 November 2002.
___________________Ecological Questions---WYDAWNICTWO UNIWERSYTETU MIKOLAJA KOPERNIKA
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Submitted on: 07 July 2008.
Revised on: 27 August 2008.
Accepted on: 20 October 2008.
___________________Ecological Questions---WYDAWNICTWO UNIWERSYTETU MIKOLAJA KOPERNIKA
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