11 



per inflorescence, were higher at Canyon 

 Creek. The number of seeds per fruit 

 was quite similar for each site 

 (Appendix B, p. 17) . 



Although the differences in fecundity 

 are interesting, no conclusions can be 

 drawn yet. The Lime Gulch (012) 

 population is approximately 1,000 feet 

 lower in elevation than Canyon Creek 

 (Oil) , and is located on the lower 

 eastern flanks of the Pioneer Mountains 

 in the rain shadow of some of the 

 highest peaks of the range. Thus, it is 

 likely to receive substantially less 

 precipitation and have warmer 

 temperatures than the Canyon Creek 

 population. These site differences 

 influence the phenology of the 

 populations. The data indicates that 

 there needs to be at least a one to two 

 week delay in reading the Canyon Creek 

 transects, in order to obtain data 

 comparable to Lime Gulch (Appendix B, p. 

 17). 



I.8.C.2. b. Interspecific: Density and fecundity of 

 Arabis fecunda populations may be 

 influenced by the presence and abundance 

 of Centaurea maculosa (spotted 

 knapweed) . Reports from an ongoing 

 study of the interactions between these 

 two species from sites in Ravalli County 

 is contained in Appendix B of 

 Schassberger (1988) , and in Appendix A 

 of this report (p. 16) . See also 

 Hamilton and Mitchell-Olds (1989). 



I. 9. A. General nature of ownership: The Cattle 



Gulch (013) site is on U.S. Forest Service 

 lands. 



I.9.B. Specific landowners: 



1. USDA Forest Service 



Beaverhead National Forest 

 610 N. Montana Street 

 Dillon, MT 59725 



I.ll.A.l. Present or threatened destruction, 



modification, or curtailment of habitat or 

 range: The A. fecunda population at Cattle 



