












The analyses of several factors associated with the call-count 
vey revealed that, in each management unit, the 1971 survey was run 
inder conditions that were significantly colder (p<0.01) than in 1970 
table 2). No significant change in date occurred within management 
unit between 1970 and 1971. Survey cooperators encountered signif- 
icantly (p<0.05) more high disturbance on routes run in the Western 
nit in 1971. No significant change in the frequency of high disturb= 
ance was found between routes run in 1970 and 1971 in either the Eastern 
r the Central Management Units. 
A study of the data from physiographic regions obtained from 1970 
nd 1971 within each management unit was also made. As identified in 
figure 1, significant (p<0.05) increases occurred in the Superior 
Uplands (Region 010) of the Eastern Management Unit, and in the West 
joastal Plain (036) of the Central Management Unit. Significant 
decreases occurred in the Floridian Coastal Plain (033), Colorado 
Piedmont (136), and Sonoran-Mojave Desert (222). 
1961 to 1971 long-term population trends.--Statistical analyses 
of the 1961-71 data revealed that significant (p<0.05) downward trends 
in BDI's occurred in all management and submanagement units, except for 
the combined nonhunting States of the Eastern Unit (table 3). A sig- 
nificant upward population trend occurred in the Eastern nonhunting States. 
This report presents the results of long-term BDI data analyzed by 
State and physiographic region (tables 3 and 4). Eight States were deter- 
mined to have significant (p<0.05) upward population trends between 1961 
and 1971, while 17 States had downward trends in population (fig. 10). 
From 1965 to 1971, three of 67 physiographic regions had significant 
upward population trends, whereas nine regions had downward trends in 
population (fig. 11). 
ACKNOWLEDGMENTS 
This report would not be possible without the cooperation of the 
State conservation departments and the many individuals who assisted 
in collecting data. Preparation of this report represents a combined 
effort; special thanks are extended to Mr. Frederick R. Fiehrer for 
computer programming assistance, Mrs. Kathy Judy for preparing several 
of the figures, and Mrs. Katheryn Munson for typing the final manuscript. 
2) 
