
199 
Table II. - Aerial Count Trends. 
Ducks Per Sq. Mi. Ducks Per Sq. Mi. Percent Change 
Area 1954 1955 1954. to 1955 
Eastern 13.51 | 2.25 - 83.3 
Central 9, 00% 7.03 - 21.9 
Western 
Over-all 10. 30 5.68 - 44.9 

* The 1954 aerial count did not separate the central and western 
area; this count was made one month later than the 
eastern count. The figures given here have been 
adjusted to a mid-May count by ground count data which 
showed a loss of 31 percent in observed ducks for the 
corresponding period. 
Table Ill. - Summary of Species Indices. * 



Species Eastern Central Western Over-all 
Mallard 4,259 11, 360 16,379 31,998 
Gadwall 300 2,182 8, 261 10,743 
Baldpate 310 431 992 1,733 
Pintail 1,213 3, 345 6, 308 10, 866 
Green-winged Teal 310 292 316 918 
Blue- winged Teal 7,001 13,035 12,953 32,989 
Shoveler 600 1,307 3,503 5,410 7 
Redhead 155 1, 302 3, 384 4,841 
Canvasback - - 526 526 
Scaup - 602 421 1,023 
Bufflehead - - 316 316 
Goldeneye - 59 = if 59 
Ruddy Duck - 144 298 442 
Total Breeding Ducks 14, 148 34,059 53,657 101, 864 
Non-Breeders - 3, 148 9,679 12,827 
Total, All Ducks 14, 148 37, 207 63, 336 114, 691 

* Species composition determined from ground counts made immediately 
following aerial counts. Species indices for each area corrected 
for non-breeding ducks and for hens nesting represented by lone 
males, 
