TABLE B-36. —Waterfowl brood and late-nesting indexes by stratum 
compared with previous year and long-term averages, 
North Dakota, South Dakota, and western Minnesota, 1964 
[Index numbers in thousands] 
Stratum 
Total 
Average 
Percent change 
from— 
Species 
East 
Central 
West 
1963 
1964 
1959-64 
1963 
Average 
Broods: 
Ducks brood index -- 
11.6 
18.1 
2.0 
108.1 
31.7 
62.8 
-70.7 
-49. 5 
Average brood size 1 - 
6.2 
8.0 
5.5 
5.2 
6.0 
4.9 
+15.4 
+22.4 
Coot brood index- 
.0 
2.9 
.0 
4.4 
2.9 
3. 5 
-34.0 
-17.1 
0 
Late-nesting index: 
Dabblers: 
Mallard- 
4.9 
14.0 
4.5 
30.8 
23.4 
29.7 
-24.0 
-21.2 
Gadwall- 
1.2 
8.0 
— 
10.1 
9.2 
7.2 
-8.9 
+27.8 
American widgeon- 
— 
— 
— 
1.3 
— 
.5 
— 
— 
Green-winged teal- 
— 
— 
— 
.4 
— 
.1 
— 
— 
Blue-winged teal- 
8.5 
19.6 
2.0 
17.4 
30.1 
20.9 
+73.0 
+44.0 
Shoveler - 
— 
1.8 
— 
— 
1.8 
.7 
— 
+157.1 
Pintail- 
— 
— 
— 
3.3 
— 
4.6 
-- 
— 
Subtotal-- 1 - 
14, 6 
43.4 
6.5 
63.3 
64.5 
63.7 
+1.9 
+1.3 
Divers: 
Redhead - 
1.2 
1.3 
— 
4.7 
2.5 
2.9 
-46.8 
-13.8 
Canvasback - 
— 
.4 
— 
— 
.4 
.2 
— 
+100.0 
Scaup - 
— 
— 
— 
— 
— 
.4 
— 
— 
Ring-necked duck- 
— 
— 
— 
— 
— 
.8 
— 
— 
Ruddy duck--- - 
1.2 
1.4 
— 
16.4 
2.6 
7.4 
-84.1 
-64.9 
Subtotal - 
2.4 
3.1 
— 
21.1 
5.5 
11.7 
-73.9 
-53.0 
Total- 
17.0 
46.5 
6.5 
84.4 
70.0 
75.4 
-17.0 
-7.2 
1 Class II and HI broods only. 
o 
As indicated by adult pairs and singles. 
74 
