154 COVICH, SHEPARD, BERGEY, AND CARPENTER 



CONCLUSION 



Fluctuations in water level and water flow resulting from 

 reservoir discharge were found to influence the chironomid popula- 

 tions in both the discharge-receiving river and its tributaries (at least 

 as far upstream as water backed up from a second reservoir pool). 

 The greater the degree of fluctuations, the greater the effects 

 appeared to be, so that decreasing density, biomass, and numbers of 

 genera characterized the most intensely fluctuating sites. 



A single chironomid genus, Glyptotendipes, clearly dominated all 

 seven stations. In our study, however, we were unable to identify 

 specific mechanisms responsible for this dominance. With the 

 establishment of adequate base-line data, we should be able to follow 

 community development in selected habitats and to learn a great deal 

 about relationships between dominance and habitat stability. 



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