The Effect of Timber Management on Stream Water Quality 



UJ 30- 



^ 20- 





 0.20 



TAXA RICHNESS 



NO to LOW ACTIVITY 

 MODERATE ACTIVITY 

 HIGH ACTIVfTY 



Q 



Z 0.08- 



SIMPSON'S INDEX 



. bi 



•-0 

 0.20 



Figure C-3. Autumn taxa richness and Simpson's index of riffle habitat macroinvertebrates 



at each of ten paired watershed sites. Site pairs appear as directly comparable sites with 



different levels of timber management activity in the watershed. 



Flathead Basin Cooperative Program Final Report 



Page 49 



