Table 56. Seasonal Changes in Sex Ratios of Adult Mallards in Nine 
States of the Mississippi Flyway 
Sa SLT St ee ee REE See RAE 

-105- 










State Period Males/100 Females Sample Size 
Minnesota 
Oct. 7 67 ‘ 70 
mn 68-13 04 258 
" 14-20 83 64 
Oct. 21-Nov. 3 67 70 
Nov. 4-25 371 33 
Total 91 495 
Wisconsin 
gh DST tat % Oct. (-13 75 49 
" qh-27 | 105 43 
Oet.28-Nov. 25 80 18 
Total 86 110 
Michigan 
Oct. 7-11 120 1l 
mw 12-25 78 16 
"  §26-Nov. £5 129 16 
Total 105 43 
Iowa 
Oct. 20-26 93 54 
Oct. 27-Nov. 2 121 31 
Nov. 3-Dec. 8 278 34 
Total 133 119 . 
Illinois 
Octe 30-Nov. 3 150 140 
Nov. 4-10 222 129 
Nov. 11-17 92 100 
Nov. 18-Dec. 8 212 100 
Total 161 469 
Missouri 
Nov. 6-12 211 140 
" 13-26 241 99 
Nov. 2 7~Dec. 25 182 113 
Total 209 352 
