Submitted on: 11 August 2018.
Revised on: 14 September 2018.
Accepted on: 09 October 2018.
___________________Hidrobiologica---UNIV AUTONOMA METROPOLITANA-IZTAPALAPA
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Submitted on: 07 May 2004.
Revised on: 20 June 2004.
Accepted on: 02 August 2004.
___________________Hidrobiologica---UNIV AUTONOMA METROPOLITANA-IZTAPALAPA
Submitted on: 22 April 2002.
Revised on: 07 August 2002.
Accepted on: 06 September 2002.
___________________Hidrobiologica---UNIV AUTONOMA METROPOLITANA-IZTAPALAPA
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