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native predator that accounts for -a large percentage of the 

 juvenile salmonids lost to predation (Rieman et al. 1991). 

 Shallow, low-velocity shoreline areas are important rearing 

 habitats for northern squawfish (Olney 1975; Beamesderfer 1992). 

 Monitoring changes in the relative abundance of northern squawfish 

 and other fishes in nearshore habitats of John Day Reservoir nay 

 help us further understand comaunity-level interactions following 

 abiotic changes in the raaervoir environment. 



Goals and Objectives 



During phase 1 of this study, in 1995, we propose to evaluate 

 and monitor the nearshore fish community in John Day Reservoir, 

 concentrating on collecting and synthesizing predrawdown 

 information. Efforts will focus on fishes < 250 mm fork length 

 (fl) using beach seines. We are targeting "prey-sized" fishes 

 because this may allow for comparisons with a previous study of the 

 nearshore fish community in the John Day Pool (Palmer et al. 1986) . 

 We will also review and analyze existing predator-prey data, which 

 dates back to 1982, and use existing predator-prey models to better 

 predict potential impacts of a John Day Reservoir drawdown. 

 Modeling approaches for studying drawdown impacts will be reviewed 

 and simulations will be conducted to identify critical processes 

 and future data needs. The benefits of this study are multiple and 

 will result in a better understanding of the abundance and 

 distribution of nearshore fishes in the John Day Pool as well as 



