brood rearing habitat. 



4. availability of food base. 



5. disturbance risk or potential threats to area. 



6. stream gradient. 



7 . stream temperature . 



8. stream width and flow volume. 



Our methods for describing the 8 components follow: 

 stream channel - Using USFS definitions (D. Perkinson pers. 

 comm. 1990) we classified portions of streams we surveyed as 

 braided, meandered, channeled, or canyoned. 



stream side vegetation - We determined stream side 

 vegetation by periodically recording type and density or cover of 

 prominent vegetation or substrate as we walked the stream. We 

 determined density of general vegetation types and substrate 

 types by stopping approximately every 10 minutes and ocularly 

 estimating percent cover of types along approximately 50 ft 

 stretch of stream. We grouped coverages into 3 classes: Low (1- 

 30%), Moderate (31-70%) and High (71-100%). We defined 

 vegetation types as the most prominent species or group of 

 species observed. For example, some types of vegetation groups 

 we encountered were: "riparian shrub composed of willow ( salix 

 spp ) , alder (alnus spp ) , and black twin-berry ( Lonicera 

 involucrata ) " and "willow (salix spp ) flats interspersed with 

 gravel bars". We also determined coverages of prominent non- 

 vegetated areas such as gravel bars, bed rock, and mud flats. 



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