16 



Table 2. Contingency tables and their associated probabilities for three Arabis fecunda life stage classes 

 (see Methods) and two rooting substrates for four transects at the three study sites. The null hypothesis 

 is that the distribution of classes is independent of substrate. 



Birch Creek 



Bare Soi I Total 



13 (2r/) 17 



29 (60%) 86 



6 (13%) 28 



48 (100%) 131 



X^=14.72, p=0.001 



Charley's Gulch 

 Bare Soi I Total 

 8 (21%) 24 

 13 (34%) 68 

 17 (45%) 70 

 38 (100%) 162 



X''=2.04, p=0.360 



Lime Gulch North 



Bare Soi I Total 



22 (24%) 82 



50 (54%) 149 



21 (22%) 70 



93 (100%) 301 



X^=1.16, p=0.561 



Lime Gulch South 



Bare Soi I Total 



31 (27%) 54 



65 (57%) 182 



18 (16%) 40 



114 (100%) 276 



X''=8.35, p=0.015 



