Waterfowl Production on the Woodworth Station
in South-central North Dakota, 1965-1981
Table 43. Estimates of broods per 100 pairs of ducks,
Woodworth Study Area, 1965-81a.
Table 43. Estimates of broods per 100 pairs of ducks, Woodworth Study
Area, 1965-81a.
Species |
1965 |
1966 |
1967 |
1968 |
1969 |
1970 |
1971 |
1972 |
1973 |
1974 |
1975 |
1976 |
1977 |
1978 |
1979 |
1980 |
1981 |
Mean |
Mallard |
18 |
50 |
17 |
3 |
62 |
19 |
57 |
17 |
7 |
30 |
31 |
4 |
54 |
23 |
20 |
16 |
50 |
25 |
Gadwall |
29 |
45 |
25 |
24 |
64 |
15 |
73 |
19 |
8 |
54 |
16 |
19 |
61 |
22 |
21 |
33 |
28 |
30 |
Northern pintail |
38 |
41 |
15 |
36 |
79 |
11 |
8 |
11 |
9 |
34 |
14 |
7 |
20 |
7 |
24 |
6 |
15 |
22 |
Green-winged teal |
33 |
90 |
54 |
57 |
33 |
25 |
64 |
8 |
7 |
75 |
33 |
0 |
0 |
25 |
0 |
10 |
0 |
32 |
Blue-winged teal |
30 |
70 |
36 |
31 |
65 |
28 |
79 |
34 |
29 |
21 |
38 |
4 |
31 |
19 |
23 |
21 |
26 |
33 |
Northern shoveler |
23 |
70 |
45 |
19 |
61 |
23 |
27 |
31 |
13 |
25 |
18 |
3 |
14 |
15 |
11 |
14 |
6 |
25 |
American wigeon |
31 |
42 |
7 |
22 |
44 |
20 |
100 |
24 |
0 |
36 |
14 |
0 |
33 |
33 |
83 |
23 |
88 |
31 |
Redhead |
50 |
11 |
40 |
21 |
19 |
44 |
33 |
29 |
0 |
32 |
11 |
18 |
0 |
6 |
5 |
44 |
23 |
21 |
Canvasback |
9 |
67 |
0 |
0 |
50 |
50 |
0 |
100 |
50 |
250 |
22 |
133 |
0 |
33 |
79 |
28 |
93 |
50 |
Lesser scaup |
26 |
21 |
0 |
23 |
32 |
14 |
41 |
17 |
0 |
3 |
9 |
13 |
0 |
31 |
0 |
26 |
52 |
18 |
Ruddy duck |
23 |
127 |
250 |
22 |
36 |
500 |
200 |
38 |
0 |
26 |
33 |
313 |
0 |
29 |
4 |
33 |
13 |
39 |
Ring-necked duck |
0 |
40 |
50 |
0 |
200 |
0 |
0 |
0 |
0 |
0 |
0 |
100 |
0 |
0 |
0 |
50 |
0 |
32 |
Total |
28 |
58 |
34 |
25 |
60 |
23 |
64 |
27 |
15 |
29 |
29 |
61 |
36 |
22 |
30 |
22 |
33 |
30 |
aNumbers greater than 100 are due
to the difficulty of determining accurate pair estimates or brood immigration
into the area or both.
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