source was 13. Species captured varied considerably with site. 

 At both Mystery Cave and Little Ice Cave, where the most bats 

 were captured, only species of the genus Myotis were captured, 

 while at Gyp Spring and Sage Creek campground, species diversity 

 was greater.. Capture success rates were much higher at caves 

 than at water sources. In all cases, the majority of bats 

 captured were netted within the first three hours of darkness, 

 and very few additional bats were captured when nets were left 

 open beyond this time. 



WATER SOURCES 



Gyp Spring (T. 9 S., R. 27 E., Sec. 33, Carbon Co., MT; 

 elevation: 1400 m) was netted on nine occasions on the following 

 dates: 17 and 21 June, 24 and 29 July, 6, 15, and 21 August, and 

 1 and 2 September. Generally, two 5.5 m nets and two 9 m nets 

 were deployed at this site. The spring originates just north of 

 the Wyoming border on BLM land; the resultant stream flows south 



TABLE 4. — Bats captured at Gyp Spring 



Total 



25 



28 



53 



into Wyoming approximately .80 km before entering private land. 

 The area surrounding the spring is characterized by 10 m high 

 red-sandstone outcrops. The vegetation surrounding the spring is 

 representative of the Utah juniper-blacksage ecosystem. Bat 

 species diversity was greatest at this site, and Antrozous 

 pallidus was observed only at this site. Netting was done at the 

 head of the spring, and 53 bats were captured (Table 4) . 



Bats were netted at Sage Creek campground (T. 7 S., R. 26 E., 

 Sec. 20, Carbon Co., MT; elevation: 1676 m) on the following 

 dates: 1, 2, 8, 19 July; 7, 9, 13, 20, 28 August; 3, 9, 10 

 September. Bats were netted just east of the Sage Creek 

 campground road on USPS land along a slow moving section of 

 stream. The width of the stream at this site ranged from 

 approximately 5 m to 10 m. Bats could probably drink from Sage 

 Creek along its entire length in this area, but this site 

 represents the only slow moving and open portion of the stream in 



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