MISSISSIPPI FLYWAY 
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: 
Wood Duck Breeding Pair Surveys (Float-Trips 

Lineal Miles | -” Potential Breeders 
Year __ Censused _- ‘Per Lineal Mile 
1950 81 ae | 
1951 120 ~32 
1952 82 a 
1953 95.5 » 85 
1954 93.5 58 
1955 111.2 70 
1956 110.5 28 
1957 135.4 «46 
The percentage of occupied wood duck nest boxes in the past 
nine years follows: 
Swan Creek Wildlife Experiment Station = Allegan County 
Boxes Occupied by Percent of 
Year Examined -- Wood Ducks -- Nest Boxes Used 
1949 40 9 2245 
1950 35 . 10 28.6 
1951 33 11 33.3 
1952 32 . 4 12.5 
1953 26 9 34.6 
1954 24 8. 23,3 
1955 20* 5 25.0 
1956 41% 5 12.2 
7 L703 
1957 40* 

* Metal predator-proof boxes used. 
In 1956 and 1957, nest boxes were examined also on the Rose 
Lake, Grass Lake, and Seney Refuge areas. The results of these exam- 
inations are as follows: 
ad. = Boxes Occupied by Percent of 
Year | Examined = _ - Wood Ducks —-- Nest Boxes: Used 
1956 37 10 27% 
1957 AY 13 26% 

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