Figure 2. Depletion curve for 1989 sample populations of 

 Botrvchium hesperium . B. paradoxum and B^ vatertonense . 



if) 



i_ 



O 

 > 



> 



C 



O 



i_ 



100 



80 - 



60 



40 



20 







• hesperium 

 V paradoxum 

 ▼ watertonense 



89 90 91 



Year 



92 



