Tall Coulee Shrub 



400 



300- 



o 



o 



— 200 

 in 



< 

 S 



o 



m 



100 



• Silver Sogebrush 



U— Sclrpus Marsh 



A Grassland 



O Coulee Trunk 



D— Scorio 



A. 





A 



(D) 



• A 



iJ 



I 



T 



1977 



1978 1979 



l| Fall trapping only 



Figure 27, 



Year-to-year changes in small mammal biomass for six habitats 

 sampled in the Circle West study area (control and experimental 

 data dre averaged for combined spring-fall data for each habitat) 



▲ — Toll Coulpp t^hrub ^ ^ ' 



400 



300- 



o 



o 



^ 200 



(4 

 M 



< 



s 

 o 



100- 



<9 



z 

 < 



0- 



100 



Toll Coulee Shrub 



• Silver Sagebrush 



■ — • — Scirpus Morsh 

 A Grossland 



y 



&•*, 



y 



N -A 



N 

 \ 

 N 



1978 



I 

 1979 



Figure 2H. 



Year-to-year changes in spring-fall small mammal biomass change 

 for six habitats sampled in the Circle West study area (control 

 and experimental data are averaged for each habitat). 



67 



