" Survivorship 



Survivorship of the 1990 Arabis fecunda cohort over 1990-93 was 

 significantly lower at Vipond Park than at either Lime Gulch (LR=9.22, P<0.01) 

 or Charleys Gulch (LR=3.96, P=0.05; Fig. 3). Survivorship at Lime Gulch and 

 Charley's Gulch was not different (LR=0.01, P=0.91; Fig. 3). Analysis of the 

 depletion curve for the 1989 uneven-age populations gave similar results. 

 Arabis fecunda populations at Charleys Gulch and Lime Gulch have type II 

 survivorship curves where number of deaths is a constant with time, while the 

 Vipond Park population's survivorship fits more closely a type III curve, 

 where probability of death is a constant (Deevey 1947). 



From 1991 through 1993, the proportion of new recruits that survived was 

 67% at Charleys Gulch, 74% at Lime Gulch and 57% at Vipond Park. The ratio of 

 survivors to deaths of new recruits at Vipond Park was significantly lower 

 than either Lime Gulch (x"=35.3, P<0.01) or Charleys Gulch {x"=4.14, P=0.04), 

 A while Lime Gulch and Charleys Gulch were not different (x"=1.90, P=0.17). 



Growth 



In two out of four years, significantly more Arabis fecunda plants moved 

 into larger size classes at Vipond Park compared to Charleys Gulch, and in 

 three out of four years growth was significantly greater at Lime Gulch 

 compared to Charleys Gulch (Fig. 4). When summed over all four years, there 

 were significantly fewer plants moving into larger size classes at Charleys 

 Gulch (x^=24.761, df=2, P<0.001), but there was no difference between Lime 

 Gulch and Vipond Park (x-=l-281, P=0.26). 



Fecundity 



Over the course of the study the ratio of the number of Arabis fecunda 

 plants that bloomed at an early age (<2 yr) to later (>2 yr) was 1.1 at 

 Charleys Gulch, 1.75 at Lime Gulch and 4.0 at Vipond Park. Vipond park was 

 ^ significantly greater than both Lime Gulch (x^=17.05, P=0.001) and Charleys 



