included. 



Five Corynorhinus townsendii were observed on the ceiling of the cave, 25 or 30 feet above the floor 

 of the passage. One was at the NW end of the entrance room and the other four were near the eastern extreme 

 of the cave, in a dome area about 28 feet high. Our proximity did not disturb them and although they were 

 aware of our presence they did not become agitated. 



Ambient temperatures in the cave were quite warm. At the bottom of the entrance drop T^ Bulb equalled 

 77°F and T Wel Bulb was 65°F. Toward the east end of the cave, near the floor, the temperature was much warmer 

 and the air seemed stuffy. More of the bats were in this area of the cave and some packrat litter was scattered 

 across the passage floor. Measurements at this end of the cave found T^ Bulb was 83°F and T Wet Bulb was 72°F. 

 Air monitoring for oxygen depletion found no bad air anywhere in the cave. 



Two hot spring pools are located in the floor of the cave about 9 feet apart. Their temperatures were 

 warm and both had thick crusts of calcite raft deposits floating on the water surface. The eastern pool measured 

 7'/2 feet long and up to 3 feet wide, at 94.2°F. The western pool was at about the same water level, measuring 

 about 3'/2 feet long by \ l A feet wide, at 85°F. No bubbling was observed in either pool. 



ANABAT recordings outside the entrance identified four bat species in the vicinity. These included 

 Corynorhinus townsendii, Eptesicus fuscus, Lasionycteris noctivagans, and some undifferentiated Myotis spp. 



Pinion Terrace site : Jeweled Cave and the other large cave here were monitored for bat activity without success. 

 Interior examination of these and the other small caves on Pinion Terrace found a few traces of bat guano but 

 no large colonies. One Myotis spp. bat was observed in the crack-like cave near the edge of the terrace. Due 

 to the vertical nature of this cave, a close examination of the bat could not be made. 



All the caves on this terrace have normal interior temperatures. Thermal activity at this level on Terrace 

 Mountain has been dormant for hundreds of years. Air quality is also excellent. 



Mammoth Hot Spring Reservoir, Joffe and Africa Lakes : The area around these small lakes had more bat activity 

 than any other. These small ponds offer an excellent foraging area and also provide open water free of hot 

 spring discharges. These ponds present the closest large, open stretches of water to the rocky cliffs in Glen 

 Creek canyon and the caves and shelters of the upper Mammoth Hot Springs terraces. Five cr more species of 

 bat were detected here, including Corynorhinus townsendii, Eptesicus fuscus, Lasiurus cinereus, Lasionycteris 

 noctivagans, and one possible Myotis thysanodes. Two of these species, C. townsendii and M. thysanodes, are 

 species needing special management consideration because of intolerance to disturbance and declining population. 

 Myotis thysanodes may also have been recorded at other sites, however, most species of Myotis are difficult to 

 distinguish from their calls. Many of the sites sampled had calls identified as Myotis spp. because a definitive 

 identification could not be made. 



Indian Creek Campground Bridge : Thirty-eight Myotis calls were recorded here on 12 Aug, 1997, along with 

 seven other unidentified calls. Sample sites both up and down stream of the bridge (sites 12 and 14) recorded 

 no calls. 



Willow Flats at Moose Exhibit : A large number of bats were observed feeding over the river here. Eptesicus 

 fuscus were identified, but most were undifferentiated Myotis spp. making multiple passes through the meadow. 



The rest of the sites produced few or no recorded calls, as can be seen from Table 1 . In many cases, 

 site characteristics were similar or the same as those found at the very active sites. Weather conditions on some 

 nights may have suppressed activity. On September 5 in particular, moderate rain and high winds lasting all 

 night filled the recording tape with storm noise and probably prevented bats from leaving their roosts. Additional 

 monitoring would prove valuable in obtaining an accurate assessment of bat use through the summer season. 



