Submitted on: 21 January 2000.
Revised on: 11 February 2000.
Accepted on: 26 March 2000.
___________________Ciencia Amazonica---UNIV CIENTIFICA PERU
Submitted on: 14 March 2008.
Revised on: 22 June 2008.
Accepted on: 22 July 2008.
___________________Ciencia Amazonica---UNIV CIENTIFICA PERU
Submitted on: 25 March 2003.
Revised on: 05 May 2003.
Accepted on: 20 May 2003.
___________________Ciencia Amazonica---UNIV CIENTIFICA PERU
Submitted on: 09 January 2015.
Revised on: 10 March 2015.
Accepted on: 01 May 2015.
___________________Ciencia Amazonica---UNIV CIENTIFICA PERU
Submitted on: 13 October 2024.
Revised on: 16 November 2024.
Accepted on: 27 December 2024.
___________________Ciencia Amazonica---UNIV CIENTIFICA PERU
Submitted on: 13 August 2005.
Revised on: 04 October 2005.
Accepted on: 12 November 2005.
___________________Ciencia Amazonica---UNIV CIENTIFICA PERU