Minnesota, Wisconsin, and Michigan into samples representing 
different periods during the season (Table 39)- In Minnesota and 
Michigan, there was a sharp drop in the age ratio as the season 
progressed, while in Wisconsin there was only a slight drop, if 
any. It seems likely that the higher age ratios in the earlier 
samples resulted from the young birds being relatively more 
vulnerable than adults early in the season. 
American Widgeon 
There were marked regional differences among age ratios of 
American widgeon (Table 40). There was a tendency for samples 
from the western States to have a higher age ratio than samples 
from the eastern States. This trend was evident in the northern 
tier of States, where samples from Minnesota and Wisconsin showed 
a higher age ratio than did the sample from Michigan. The tendency 
was even more pronounced throughout the remainder of the Flyway. 
In samples from Iowa, Illinois, Missouri, Arkansas, and Louisiana, 
combined, the age ratio was 3.04 immatures per aduit. In contrast, 
the combined samples from Indiana, Ohio, Tennessee, Mississippi, and 
Alabama (the easternmost States in the lower portion of the Mississippi 
Flyway) had an age ratio of only 0.72 immature per adult. Because 
of the small sample sizes, true differences in age ratios may not 
have been as great as indicated. Bag checks in Louisiana showed only 
0.18 immature per adult among 154 birds; this suggests that there. 
was a low age ratio among birds in the entire southern end of the 
Flyway. The wing-collection sample from Louisiana contained only 
4 birds, so no data are available for comparison.e Samples from 
Minnesota were divided into two periods to see if there was a 
seasonal change in the age ratio. During the first week in the 
season, October 7 through 13, the age ratio was 1.38 immatures per 
adult in a sample of 138 wingse During the remainder of the 
season there was an age ratio of 0.95 immature per adult, ina 
sample of 39 wings. | 
Green-winged Teal 
The age ratio in the sample from the northern tier of States 
was higher than in the samples from the remainder of the Flyway 
(Table 41). Age ratios were no higher in the second tier of States 
than in the remainder of the Flyway to the south. Data from 
Minnesota and Wisconsin indicate that there was little change in 
age ratios between the first week and the remainder of the season 
(Table 42). Sample sizes, however, were very small. As discussed 
earlier, there is also a possibility that green-winged teal were 
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