threatened by livestock grazing and encroachment by an aggressive exotic weed, spotted 

 knapweed ( Centaurea maculosa ) (Lesica 1985, Schassberger 1988). In Silver Bow and 

 Beaverhead counties, populations may be threatened by mining activity and livestock grazing. 

 Arabis fecunda is a candidate for listing as a threatened or endangered species by the U.S. 

 Fish and Wildlife Service (USDI-FWS 1990) and is considered threatened in Montana (Lesica 

 and Shelly 1991a). 



Here I report the results of the first three years of a long-term demographic 

 monitoring study at two sites in the Pioneer Range on Beaverhead National Forest. 



Lime Gulch 



Location: 



Vipond Park 



Location: 



Study Sites 



Five miles west of Interstate Highway 15 on the north side of Birch 

 Creek Road, approximately 1/4 mile up Lime Gulch from the road; T5S 

 RlOW Secl4; approximately 6,200 ft elevation. 



Approximately 12.5 miles west of Melrose on the Canyon Creek Road, 

 at the comer of the road overlooking the kilns; T2S RlOW Sec 8; 7,200 

 ft elevation. 



Further information on the study sites and location of the transects can be found in 

 Lesica and Shelly (1989). 



