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1. Yellowstone river sampling stations 6 



2. Longitudinal profile of the Yellowstone River, showing 

 invertebrate sampling stations and probable fish distribution 



zones ' 9 



3. Tongue River sampling stations 10 



4. Longitudinal profile of the Tongue River in Montana, showing 

 invertebrate sampling stations 11 



5. Sampling station 1, Corwin Springs 12 



6. Yankee Jim Canyon between sampling stations 1 and 2 12 



7. Near station 3 above Livingston 13 



8. Station 4 at Livingston 13 



9. Station 5 at Grey Bear fishing access 14 



10. Aerial view of Yellowstone River above Miles City 14 



11. The Yellowstone River about 10 miles upstream from Miles City. . . 15 



12. Yellowstone River at Glendive during early winter 15 



13. Aerial view of the Intake diversion, sampling station 18 16 



14. Yellowstone River at Intake diversion 16 



15. Kick net and other data collecting gear 18 



16. Water's round bottom sampler 18 



17. Relationships between detritus, producers, and consumers in 

 different order streams - stream continuum 28 



18. Relationship between detritus and stream consumers 29 



19. Ephemeroptera of the Yellowstone River 37 



20. Number of species of the three major orders found 



at each sampling station in the Yellowstone River 



21 . Mature nymph of the mayfly (Heptagenia elegantula) 



22. Plecoptera of the Yellowstone River 40 



23. Trichoptera of the Yellowstone River 41 



