82 M. D. Adam, M. J. Lacki, and L. G. Shoemaker 



Three environmental variables were related to NDF (Table 1); 

 NDF was positively associated with percent relative humidity, and negatively 

 related to both wind speed and moon phase. Stepwise regression demonstrated 

 a significant (F = 5.93, P = 0.0073, R 2 = 0.30) relationship of NDF 

 with relative humidity and moon phase, eliminating wind speed from 



Table 1. Regression analyses of mean nightly detection frequency (NDF) 

 with environmental variables for P. t. virginianus, Lee County, Ken- 

 tucky, summers 1990 and 1991. 



Regression 



Environmental 











variable 



Coefficient 



SE 



P 



Simple 



Relative humidity 



0.23 



0.085 



0.01 





Moon phase 



-0.06 



0.026 



0.03 





Wind speed 



-0.01 



0.004 



0.04 



Multiple 



Relative humidity 



0.20 



0.083 



0.02 





Moon phase 



-0.05 



0.025 



0.06 



Table 2. Values for nightly detection frequency (NDF) and environmental 

 variables for P. t. virginianus, Lee County, Kentucky, summers 1990 and 

 1991. 



Range 



Variable Mean CV High Low 



NDF 0.08 88.5 0.30 0.01 



Relative humidity (%) 



Moon phase (%) 



Wind speed (km/hr) 



Barometric pressure (mb) 



Maximum temperature (C) 



Minimum temperature (C) 



Precipitation (cm) 



Prior precipitation 1 (cm) 



' Represents rainfall during the day prior to sampling. 



0.77 



11.0 



0.97 



0.64 



0.44 



85.2 



0.99 



0.00 



10.80 



32.0 



20.50 



6.40 



1,017.00 



0.4 



1,024.00 



1,011.00 



28.40 



12.3 



33.30 



18.90 



16.00 



19.8 



21.10 



11.10 



0.61 



221.0 



5.84 



0.00 



0.67 



204.0 



5.84 



().()() 



