various habitats was determined. 



Mixed hardwoods were primarily cottonwoods and/or aspen stands. 

 Mature Douglas fir stands consisted of trees generally 18 inches 

 diameter at breast height (DBH). "Nearby" habitat components 

 were within 1/4 miles (440 m) of the survey sites. 



RESULTS 



Habitat Use Surveys 



A total of 20 sites were surveyed for bats on the Deerlodge 

 National Forest between June 3 and September 7, 1992 (Figure 1). 

 Four of these sites were visited twice each. An attempt was made 

 to cover as many of the forested habitats in the forest as 

 possible, and to visit sites not surveyed in 1991, as well as to 

 re-visit sites that had high bat activity in 1991. 



A minimum of one hour was spent on a walking transect, using a 

 bat detector, at each site surveyed. At several sites, two or 

 three hours of transect were run (Table 1). Two or more mist 

 nets were set up at all sites except one. Twenty-two trap nights 

 were expended at 19 sites (Table 1). 



Bat activity was recorded as bat passes per hour of transect. If 

 more than one transect was run at a site, the transect recording 

 the most activity was used for the following analysis. Activity 



