1. The Social Use of Space 



35 



Table VII 

 Mean Catch per Trapline om Dr. Moore's Alberta Study Area 



rather than the rule. Even where the numbers taken per day do initially 

 decline, a secondary increase usually ensues by the fifteenth day of trapping. 

 Furthermore, many species actually exhibit an increase in catch per day 

 as their associates are removed. Any trend of increase in catch after previ- 

 ous removal of associates can only mean that the survivors have in some 

 way altered their behavior so as to increase their exposure to traps. Further- 

 more, we must conclude that those caught earlier in time must, while still 

 alive, have suppressed this change of behavior. We shall now consider how 

 these results make possible a conceptualization of spatial, temporal, and 

 social organizations of the small mammal community. 



A. SPRING 



m • Clfthrionomys 



▲ A Peromyscus 



ALBERTA I, I-n-B NACSM LINES 1949-1957 



.7 



DAY 



B. FALL 

 i ^ • • Clethrionomys 



N A— — -A Peromyscus 



Y- N 



\ 

 \ 

 \ 

 \ 

 \ 



DAY 



Fig. 15. Seasonal capture rates for two species. With the increase in density from 

 spring to fall (see Table VII) Peromyscus apparently becomes dominant to Clethrionomys. 



