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also a higher mortality rate. Simple population growth was much 

 higher in treatment plots the first year, but lower than controls 

 the following two years. Nonetheless, simple population growth 

 for the three years combined was greater for treatment plots 

 (1.16) than controls (0.39). 



At Charley's Gulch there were also fewer A-. fecunda plants 

 in the treatment plots compared to control plots at the beginning 

 of the experiment, but more than in the control plots after one 

 year. Treatment plots had more fruiting plants than controls at 

 both the beginning and end of the experiment. Treatment plots 

 had higher recruitment rates, and lower mortality, and higher 

 fc simple population growth than controls. Over the two-year 



period, simple population growth for A^. fecunda was greater for 

 treatment plots (0.56) than controls (-0.03). 



Fecundity, as measured by number of fruits per plant, was 

 higher in treatment plots throughout the study period at both 

 sites. Results of ANOVA indicate that treatment had a 

 significant effect on the fecundity of Arabis fecunda (Table 4). 

 However, a near-significant difference was present before the 

 beginning of the experiment (ANOVA; N=135, F=3.16, p=0.078). 



Recruitment rates at both sites were significantly higher in 

 treatment plots than controls (Table 5). Otherwise, there were 

 P no significant differences between the performance of any life- 



