259 
Summary 
Water levels in the pothole area of northern Indiana have been favorable for 
both nesting and rearing of young, 
Calculated breeding pairs and brood trends, according to habitat preference, 
appeared to be correlated as increases were recorded for wood ducks and mallards, 
while blue-winged teal showed a decrease. The average for all species indicate a 
14 percent increase in brood production this year. This increase amounted to 
11 more broods and 92 more young ducks. 
The average brood size for all species and all age classes increased from 
.6.8 in 1951 to 7.0 in 1952. 
Trapping and banding was not initiated until September. 
