CO 



> 



3 

 (/) 



C 

 CO 



Autumn 

 Early Winter 

 Spring 



J 



Prey index 



Microtines 



1976 1978 1980 1982 



Year 



1984 



1986 



Figure 5.13 



Relationships among fawn survival to autumn, 

 early winter, and spring; an index to alternate 

 prey numbers; and microtine numbers. 



Although microtine populations had reached lows in 1980 

 and 1981, fawn survival did not decline to the degree of 

 previous and subsequent declines (Fig. 5.13). Increasing 

 numbers of deer mice and jackrabbits during 1980 and 1981 

 (Figs. 5.10 and 5.11) may have helped lessen 

 decline in fawn survival during those years 



the degree of 

 though fawn 



mortality 

 1981-82. 



was relatively high during the severe winter of 



145 



