126 William C. McComb and Robert L. Rumsey 



Table 3. Number of small mammals captured, January to June 1980, from 

 plots with south, north and ridgetop exposures in Robinson Forest, 

 Knott County, Kentucky. (TN = trap-nights; values within each row 

 with different letters vary significantly (P<0.05); Duncan's New Multi- 

 ple Range Test). 



Species 



Ridge 



South 



North 



Total 



(N= 1,080 TN) 

 103a 



(N= 1,080 TN) 

 92a 



(N= 1,090 TN) 

 99a 



(N=3,240TN) 



Peromyscus leucopus 



294 



Blarina brevicauda 



6a 



9a 



11a 



26 



Sorex fumeus 



3b 



8a 



14a 



25 



Microtus pinetorum 



Ob 



lb 



14a 



15 



Ochrotomys nuttalli 



5a 



la 



8a 



14 



Tamias striatus 



3a 



5a 



3a 



11 



TOTAL 



120ab 



116b 



149a 



385 



Sorex fumeus was more abundant on north slopes than on ridges, and 

 M. pinetorum was more abundant on north slopes than on ridges or 

 south slopes (/<0.05) (Table 3). 



Blarina brevicauda (TI=5.24) and P. leucopus (TI=5. 12) were least 

 sensitive to habitat disturbances due to herbicides or cutting. Sorex 

 fumeus (TI=4.03) and T. striatus (TI=3.90) were moderately tolerant of 

 habitat disturbances due to herbicides or cutting, and M. pinetorum 

 (TI=2.03) and O. nuttalli (TI=1.00) were the most sensitive to habitat 

 differences. Peromyscus leucopus (TI=2.99), T. striatus (TI=2.8 1) and B. 

 brevicauda (TI=2.75) were tolerant of different aspects, followed by S. 

 fumeus (TI=2.38), O. nuttalli (TI=2.18), and M. pinetorum (TI=1.14). 

 Geier and Best (1980) reported T. striatus tolerant (TI=4.48) and B. bre- 

 vicauda moderately tolerant (TI=2.73) of habitat change in Iowa 

 (TI m ax-6.00). The relative tolerance of each species depends upon the 

 small mammal community composition and/ or geographic location. 



Proximity of trapping station to plot edge was important to the 

 capture of B. brevicauda, T. striatus, and P. leucopus (/K0.05). These 

 species benefitted more from edge presence than did S. fumeus, O. nut- 

 talli, or M. pinetorum. 



Habitat Selection 



Results of habitat selection analyses are constrained by the number 

 of microsite characteristics quantified and by the range of values for 

 each characteristic. The results are useful for determining which habitat 

 characteristic within these constraints were important to small mammal 

 captures. 



