Muskrat Body Mass Trend 



41 



1.8 



1.6 



1.2 



0.8 



0.6- 



0.4 



•500 -450 -400 



-350 -300 -250 -200 -150 

 Time YBP (Thousands) 



Fig. 1. Mean body mass trend of Ondatra zibethicus. Solid triangles: 

 sample means for non-cave faunas reported by Martin (1993). Plus 

 symbols: sample means for cave faunas reported by Martin (1993). 

 Open squares: sample means for non-cave faunas (from Table 1). Overlapping 

 samples are denoted by two location numbers. Numbers and letters 

 indicate location of the samples (from Table 2). 



■500 



-400 



-350 -300 -250 -200 -150 

 Time YBP (Thousands) 



Fig. 2. Comparison of raw versus mean data points for Ondatra zibethicus. 

 Solid triangles and plus symbols are Martins' (1993) sample means. 

 Open squares are Bentley and Knight's raw data (from Table 1). 



