hms 
a 
cs 
Table 1 summarizes the data gathered. . 
Table 1, -- Summary of Waterfowl Data Obtained in Aerial Survey in North Dakota - 
Spring, 1950 
Note: Strips 14 and 15 covered on one-half mile basis; all others on one quarter-mile 










basis. 
Strip No. Sq. Mile Total Ducks Ducks Per 
Sampled Seen Sq. Mile 
1 69.0 2767 40.1 
2 80.0 2773 34,7 
3 79.5 1970 24.8 
a 79.5 1956 24.6 
5 80.0 a 1788 22.4 
6 80.7 5306 65.7 
7 ~ 83.0 2042 24.6 
8 83.0 1378 16.6 
9 84.0 1835 21.8 
10 85.0 1917 22.6 
ll . 85.0 1257 14.8 
12 85.0 1217 14.3 
13 86.0 1132 13.2 
14 172.5 1975 11.4 
15 5 175.5 "2153 12.3 
(15), (88. 0) (1163) (13.2) 
16 89,0 1727 19.4 
17 90.0 1955 21.7 
Totals 1586.7 35,148 Whe 2 
1 Ranges 71, 72, 73, 74, 75, and 76 not included. 
2 Strip 15 data in parenthesis obtained in quarter-mile 
survey by Fish and Wildlife Service. Not included in 
totals. 
3 Totals from one-half mile survey of strip 16 west of 
Missouri River halved. 
The Ground Survey 
Primarily for the purpose of determining species composition and sex ratios 
of resident waterfowl, ground counts of all waterfowl seen within one-eighth mile on 
either side of the road along selected routes were again made. 
Impassable roads, due to high water, made it impossible to make all counts 
identical with those of previous years. Also, expansion of the ground counts made by 
Federal Aid personnel necessitated a re-numbering of some counts. For these reasons 
the data presented this year are in some cases not absolutely comparable with that | 
previously presented for other years. However, the over-all trend should be reliable. 
