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to velocity during drawdown. Modeling will be a 

 valuable tool for understanding how changes in 

 resident fish communities (Objectives 2 and 3) might 

 influence predation and, ultimately, juvenile salmon 

 survival . 



Methods: Various modeling approaches will be 

 reviewed and considered (GIS -based approaches, 

 trophic models, bioenergetic models, "individual - 

 based models, etc.) . • ■ , 



Products: A report including: a literature review of 

 existing fish ecology and predation data for JDR, a 

 determination of the adequacy of existing littoral 

 fish community data (1983-1986) for use in 

 documenting drawdown effcts, model simulation 

 results indicating magnitude of im.pacts of drawdown 

 on predation levels on juvenile salmonids, and 

 recommendations for studies of critical processes or 

 assumptions. 



Schedule: April 1995 - March 199S (draft report due 

 01-19-96) . 



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