Figure 3. Proportion of plants dying in three consecutive 1- 

 years intervals for Botrychium hesperiuro , B. paradoxum and B. 

 watertonense populations. For each interval, values annotated by 

 different letters are significantly different by chi-square tests 

 (P<0.05, see Methods). 



c 

 o 



0.7 



0.6 



0.5 



§- 0.4 

 o 



^ 0.3 

 o 



0.2 



0.1 - 



0.0 



89-90 



90-1 

 Yeor 



91-2 



