Summery 
Roughly 350 square miles were censused by ground-automobile transscts, 
425 miles by cross-country cerial transects, 75 square miles of lakes and 
marshes by aerial surveys, end 75 square miles of rivers by aerial surveys. 
All census work involved a total of 1,025 square miles which was about 1.9 
percent of thse total area of the State of Wisconsin. 
Two methods of computing breeding populations were used and the following 
population densities were calculated: 
a. 
Dd. 
Cc. 
d. 
t= 
~@ 
Ground transects - 0.65 to 0.76 breeding prs. per sq. mi. 
Cross-country aerial transects - 0.43 to 0.98 br. prs. ner sq. mi. 
Lake and marsh survsys - 3.27 to 7.28 br. prs. per sq. mi. 
Hiver surveys - 0.96 to 2.43 breeding prs. per sq. mi. 
The averages of both methods of computation of ground and 
acrial transects indicated a populetion density of 0.705 
breeding pairs per square mile, 
There was an indicated 4 percent increase in the waterfowl breeding popula- 
tion for 1949 as compared with 1948. 
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