

Biological Survey — Oswego Watershed 



199 



drift food from each type and are calculated from the formula 

 grams x 100 



square feet 



= weight in grams of drift food per 100 square feet. 



Table 4. — Summary of Stream Drift 



No. OF 

 DETERMINATIONS 



Type of stream 

 environment 



Average weight in 



grams of drift food 



from 100 sq. ft. 



of surface 



5 



Arboreal 



.013 



6 



Densely shaded with low brush . . 

 Semi-exposed 



.0095 



9 



.0091 



9 



Exposed 



.0074 







29 



Average over all types of en- 

 vironments 







.0097 









Stream width being considered first, without taking into 

 account types of stream environments, it was found that in general 

 the greatest quantities of drift food were taken in streams having 

 the greatest widths. However it was observed that some narrow 

 streams due to their more favorable surroundings yielded greater 

 amounts of drift food, per 100 square feet of surface, in pro- 



