Long-term Monitoring Study 



In May, 1987, we established permanent belt transects of 12 

 adjacent m^' plots at each site following the methods outlined in 

 Lesica (1987). Individual Arabis fecunda plants were mapped and 

 recorded using the following system: 



S - Seedling 



R - indicates the number of rosettes per plant 



I - indicates the total number of inflorescences (stems) 



per plant 

 F - indicates the total number of fruits produced by the 



plant 



Thus, a plant with two rosettes, three stems and a total of nine 

 fruits would be recorded as R1-I3-F9. Seedlings were recognized 

 by their small size (< 15 mm diameter). Many single cpr multiple 

 rosette plants may also be first-year plants. In addition, we 

 noted the presence of recently disturbed soil and evidence of 

 livestock trampling. We did not record seedling-size plants at 

 the Birch Creek site in 1987. In 1989 we collected 50 randomly 

 selected fruits from different individual at Charleys Gulch, and 

 25 fruits at Birch Creek. Each fruit was hand-dissected, and the 

 number of seeds in each was recorded. We read the transects on 

 May 19-20, 1987 and 1988 and May 24-25, 1989. Population density 

 and fecundity data are presented in Table 1. 



Spotted Knapweed Removal Study 



In May, 1987, we established two permanent belt transects 

 consisting of 10 adjacent m^ plots at each of the study sites 

 following the methods of Lesica (1987). Transects were placed in 

 areas with relatively heavy spotted knapweed infestations. 

 Individual Arabis fecunda plants were mapped and recorded as in 

 the long-term monitoring study. For each transect, we removed 

 the spotted knapweed from five randomly selected plots by 

 carefully cutting the plants below the root crown with a sharp 

 knife. Spotted knapweed was removed from plots 2,4,5,8, and 9 at 

 Birch Creek and from plots 1,4,5,8, and 9 at Charleys Gulch. We 

 did not record seedlings at the Birch Creek site in 1987. Ocular 

 estimates of percent canopy cover of spotted knapweed were made 

 for treatment and control plots each year. We read the transects 

 on May 19-20, 1987 and 1988 and May 24-25, 1989. Data on percent 

 canopy cover of spotted knapweed are presented in Table 2 ; 

 performance parameters for A. fecunda are shown in Table 3. 



Data Analysis 



Population growth rate was calculated for each long-term 

 monitoring study site in 1988 and 1989 by taking the increase in 

 individuals over the previous year and dividing by the number of 



