Table I - Adult Wood Duck Population Comparisons, 1956 with 1952, 1953 and 


1955 Preliminary Stream Transect Survey - Indiana. _ Gontinued - 
- OF Change 
Adults Change From, From 
Observed 1955 Average 
Transect Miles Date Floated M  F M F M. F 
Mississinewa 13 5-05-52 WO . oF, 
5-10-53 12 3 
5-16-55 12 ] 
Average | 1] 4 
5-01-56 10, 3. He 2 ~l --l 
Muscatatuck 19 5-02-52 egy "20 ie cae 
—— 5-01-53 AG Ose ie 
Average 28s 16 
4-24-56 (19° Mo 4130042 ~°«~-9~~ 5 
Totals 47 1952 48 33 
1953 85 31 
1955 61. 21 
Average 65 28 
1956 46 15 -15  -6 -19 -13 
Production Indices - 
Brood counts were conducted on nine transects totaling 143 stream 
miles between May 22 and July 3. Sixty-six wood duck broods were observed, 
compared to 56 broods in 1955. Five of these transects showed slight to 
substantial increases, while four showed slight to moderate decreases, The 
1956 figure for wood duck broods per 100 miles of transect, calculated to be. 
46.2, is the first indication of an increase in the population since the peak of 
72.3 broods per 100 miles in 1952. Again we find no correlation, either by 
transect or by totals; between the number of adult wood ducks observed on 
the preliminary survey and the number of broods on the subsequent brood- 
count survey. 
74 
