7<dlw 



1. Discharges of the Yellowstone River at Miles City and Sidney 



during sampling periods 19 



2. Checklist of aquatic macroinvertebrates of the Tongue River 



and the Yellowstone River 32 



3. Macroinvertebrate fauna of the Tongue River 46 



4. Percentage composition of benthos from the Yellowstone River 



using Water's samples, August 1975 58 



5. Percentage composition of benthos from the Yellowstone River 



using Water's samples, September 1975 58 



6. Percentage composition of benthos from the Yellowstone River 



using Water's samples, October 1975 58 



7. Percentage composition of benthos from the Yellowstone River 



using Water's samples, Novenber 1975 59 



8. Mean percentage composition of benthos from the Yellowstone 



River using Water's samples, August-November 1975 59 



9. Species diversity, range of six Water's samples all six pooled, 

 August 1975 65 



10. Species diversity, range of six Water's samples and all six 



pooled, September 1975 65 



11. Species diversity, range of six Water's samples and all six 



pooled, October 1975 66 



12. Species diversity, range of six Water's samples and all six 



pooled, November 1975 66 



13. Yellowstone River aquatic invertebrate distribution based on 

 feeding mechanism 69 



14. Mean and standard deviation for four variables measured in the 

 invertebrate/current investigation in the Yellowstone River ... ?0 



15. Population estimates from the August 6 and 7, 1975, invert- 

 abrate/current samples (24 pooled samples from each station). . . 71 



16. Population estimates from the September 9, 1975 invertebrate/ 

 current samples (24 pooled samples from each station) 72 



17. Population estimates from the October 9 and 15, 1975 

 invertebrate/current samples (24 pooled samples from each 



station) 73 



vni 



