220 
Table I. - Production Trends on 143 Linear Miles of River Transects and 14 
Pothole Study Areas -- Indiana 
_ Species 
Mallard 
Black Duck 
B-w. Teal. 
Wood Duck 
Lesser Scaup 
Ringneck 
H. Merganser 
Coot 
Fla. Gallinule 
Total 
No. Broods by Age Class 
1952 1953 
T. elk Wty Lo th bit 
3 8 2 rn 3 3 
1 . l - 3 
1 1 Sue ee Z 
57 39 33 49°11 
ry l ., " . z 
~ a : E - ] 
Z 2 “ l 
2 - a 1 a A 
62 51 11 37 53 19 
Total Broods 
1952 1953 
13. 6 
2 3 
2 2 
104 93 
] a 
“ ] 
2 2 
- l 
. l 
124 109 
Percent 
Change > 
- 46 
Table II. - Comparison of Number of Young Per Brood*, by Species and Age Class, 
All Observations -- Indiana, 1952-1953 

Average No. Young Per Brood 
No. Broods 

1952 1953 in Sample Total Average 
Species I Il III I II III 1952 1953 1952 1953 
Mallard 8.2 6.4 5.3 12.5 8.7 8.3 19 22 6.7 8.8 
Black Duck - 6.0 7.0 - - 8.5 5 2 6.8 8.5 
B-w. Teal 10.0 11.0 7.0 7.3 8.2 - 7 8 8.9 7.9 
Wood Duck 7.6 6.4 6.6 9.5 8.5 6.3 114 77 Tel 8.8 
Ringneck - - - - - 13.0 - i - 13.0 
H. Merganser - 11.0 - - - 5.0 Fa ] 11,0 5.0 
Fla, Gallinule - - - 4,0 - - - 1 - 4.0 
Canada Geese As 7 5.0 - - - - 7 - 4.7 - 
Total 154 ll2 rony 8.7 
* Only whole counts are used in computing average number of young per 
brood and these figures are not to be compared with brood production 
data in Table I. 
