257 
Table I - Comparison of Calculated Total Pairs of Three Common Species of 
Breeding Waterfowl, According to Habitat - Indiana, 1951-1952 
Calculated Percent 
No. Pairs Change 
1951 1952 1952 
RIVERS 
Wood duck 103 124 + 20 
POTHOLES 
Mallard 22 28 4+ 27 
Blue-winged teal 22 21 - 5 

Total 147 173 +18 
Table II - Production Trends on 106 Linear Miles of River Transects and 
13 Pothole Study Areas - Indiana 

No. Broods No. Young Percent Brood 
Species 1951 1952 1951 1952 Change - 1952 
Mallard 5 10 19 53 + 100 
Black duck 0 1 0 8 
Blue-winged teal 4 Z 30 10 - 50 
Wood duck 73 79 452 516 + 8 
Lesser scaup 0 l 0 6 
Total 82 93 501 593 + 13 
Success of the Season 
Comparative brood data were gathered from May 28 to July 1, 1952. In 
total, 93 broods were observed this year, whereas only 82 broods were seen in 
1951 (see Table II). Increases were recorded for wood ducks and mallards, while 
blue -winged teal showed a decrease in brood production. These brood trends 
correlate somewhat with the breeding population discussed earlier in this report. 
However, the correlation by species is more uniform when considered only in 
their major habitat (see Table III). In considering all species throughout the 
State, there was a 14 percent increase in brood production. 
The average size of individual broods, according to age class, shows an 
increase in all species recorded in 1951; the one exception being wood ducks of 
the second age class (see Table IV). 
On all comparable areas, 1951 counts totaled 82 broods or 501 young, and in 
1952, a total of 93 broods involved 593 young. More partial counts were obtained 
in 1952 and the young were somewhat older, yet more young were seen. This 
further substantiates preater rearing success this year. 
