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Oct Nov Dec Jan Feb 



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Figure 7.6 



Age of males associated with radio-collared 2- 

 year-old and older females during September 

 through February. 



Factors Influencing Group Size and Composition 



The increase in group size from June-July through 

 March despite a decline in total deer density through the 

 period indicated that seasonal change in group size resulted 

 from changing sociability and habitat use rather than changes 

 in deer density during the year. 



To determine whether seasonal group size changed 

 from year-to-year as density of deer changed, correlations 

 between annual deer numbers on the study area (density) and 

 group size during autumn and early winter each year 1976-1985 

 were computed. The null hypothesis that group size did not 

 increase as deer density increased was not rejected in any 

 case. Correlation coefficients between deer numbers during 

 autumn and group size were: total group size, r=-0.242, n=10; 

 adult group size, r=-0.067, n=10; and female group size, r = 

 -0.102, n=10 (all P's > 0.05). Coefficients between deer 

 numbers during early winter and group size were: total group 

 size, r=-0.263, n=9; adult group size, r=-0.121, n=9; and 



190 



