MICHIGAN - Continued 
Wood Duck Surveys 
Breeding population changes for wood duck were determined by float- 
trip censuses and by percent occupancy of nest boxes. ‘The data collected are 
as follows: 
Float Trips 
Lineal Miles Potential Breeders 
Year Censused Per Lineal Mile 
1950 81 o17 
1951 120 232 
1952 82° 221 
1953 95.5 285 
1954 93.3 58 
1955 14.1.2 efO 
1956 110.5 28 
1957 135.4 o4G 
1958 121.0 033 
Nest Box Occt c 
Swan Creek Wildlife Experime nt Station 
Allegan County | 
ee: Boxes Occupied by Percent of 
Year Examined. | Wood Ducks Nest Boxes Used 
1949 ho 9 22.5 
1950 35 10 28.6 . 
1951 33 J1 333 
1952 32 \ 12.5 
1953 26 9 34.6. 
1954 ak 8 33.3 
1955 20* 5 25.0 
1956 41% 5 12.2 
1957 hox T 175 
1958 | 36% 5 11.8 
* Metal predator-proof boxes used, 
From this information we can see here little change in the number of 
wood ducks in Michigan. 
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