7 

 From 3 July to 1 August, botanical data surrounding 15 

 nests (active 1992) were recorded with the use of ECODATA 

 methodology (Appendix C, DeVelice 1991). Shannon's index 

 and Hill's numbers as measurements of diversity for plant 

 species present within a 10.9 m radius surrounding each nest 

 were calculated for each ECODATA plot (Ludwig and Reynolds 

 1988) . 



RESULTS 



I found a total of 16 active Ferruginous Hawk nests 

 while performing surveys. I also discovered 24 inactive 

 nests over the course of the field season. Nests ranged in 

 elevation from 1635 to 2286 m (5365 to 7500 feet) (x = 

 1887.8 m, SD = 178.5 m, n = 50). Legal descriptions of each 

 nest with habitat associations are presented in Appendix D. 

 Completed "Raptor Nest Inventory" forms are on file at the 

 Dillon Resource Area office. Additionally, 11 active nests 

 located in the Centennial Valley adjacent to our study area 

 (Marco Restani, pers. comm.) were visited to record 

 productivity and to describe nesting habitat. Locations of 

 other raptor nests observed are listed in Appendix E. 



Density of active territories was quite variable 

 between the areas that were surveyed (Table 1) . The two 

 areas with highest Ferruginous Hawk breeding pair densities 

 were the Frying Pan Basin and Diamond Butte areas, both of 

 which contained a significant amount of private lands. The 



