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Submitted on: 29 April 1998.
Revised on: 26 June 1998.
Accepted on: 24 July 1998.
___________________ESTUARINE COASTAL AND SHELF SCIENCE
Submitted on: 16 September 2000.
Revised on: 09 December 2000.
Accepted on: 20 January 2001.
___________________ESTUARINE COASTAL AND SHELF SCIENCE