OT ES Se Se ee a 
; CENTRAL FLYWAY 
Table 2 - 1957 Breeding Population Index - North Dakota 

r Strata 
Species West Central East Total 
Pintail 11,368 89,626 2,790 103, 784 
Mallard 24,360 240, 668 3,720 168, 748 
Baldpate = 2,010 ” 2,010 
Shoveler “ 10,450 “ 10, 450 
Gadwall ~ 33,359 - 33,358 
Blue-winged Tea! 4,466 93,243 1,860 99,569 
Scaup ~ 12,459 ~ 12,459 
Canvasback ws 6,029 Ly 6.029 
Redhead ~ 11,253 - 11,253 
Ruddy Duck o 2,010 - 2,010 
Total | 40,194 401,106 8,370 449, 670 

Lone Drake Index ~ 65 percent 
Table 3 - Summary of Waterfowl! Breeding Population Trends in North Dakota 
1950 ~ 1957 





Percent 
Average Index. 1956 1957. Change 
Species 1950 ~ 1955 index Index | from 1956 
Pintail 425,080 306,553 103, 784 ~ 66 
Mallard 189,536 163.043 168, 748 - § 
Baldpate ; 30,558 27,542 2,010 - 93 
Shoveler 124,375 113,326 10,450 ~ 9) 
Gadwall 82,007 109, 166 33,358 - 70 
Blue-~winged Teal 449,219 520,007 99,569 - 81 
Scaup 41,257 45,187 12,459 ~ 72 
Canvasback . 35,016 55.228 (2,029 &9 
Redhead 41.667 49.921 11,253 78 
Ruddy Duck 20,078 20,370 2,010 - 90 
Other &,585 - 4,160 -— - 
Total - 1,345,378 1,434,503 449,670 ~ 69% 
Coot 958 1,352 10,908 +706% 
In view of the fact that the method of survey and the survey 
crew members changed between 1956 and 1957, the comparability of the 
data in Table 3 are questionable. Ground surveys in both 1956 and 1957 of 
53 
