Waterfowl Production on the Woodworth Station
in South-central North Dakota, 1965-1981
Table 4. Wetland class: average number and area during four survey periods,
Woodworth Study Area, 1965-75.
Table 4. Wetland class: average number and area during four survey
periods, Woodworth Study Area, 1965-75.
Wetland class |
Mid-May |
Early June |
Early July |
Early August |
|
n |
ha |
n |
ha |
n |
ha |
n |
ha |
I-ephemeral |
12 |
1 |
7 |
1 |
3 |
1 |
1 |
<1 |
It-ephemeral
tillage |
2 |
1 |
1 |
1 |
1 |
1 |
0 |
0 |
II-temporary |
43 |
8 |
31 |
6 |
15 |
3 |
6 |
2 |
IIt-temporary
tillage |
2 |
1 |
1 |
<1 |
<1 |
1 |
<1 |
<1 |
III-seasonal |
229 |
170 |
213 |
163 |
139 |
135 |
92 |
111 |
IIIt-seasonal
tillage |
4 |
3 |
3 |
4 |
2 |
4 |
1 |
3 |
T-2-standing stubble |
1 |
1 |
1 |
1 |
<1 |
1 |
0 |
0 |
T-3-mulched stubble |
<1 |
<1 |
0 |
0 |
<1 |
1 |
0 |
0 |
T-4-summer fallow |
2 |
1 |
1 |
1 |
<1 |
<1 |
<1 |
<1 |
IV-semipermanent |
43 |
250 |
43 |
248 |
40 |
245 |
34 |
230 |
V-permanent |
1 |
53 |
1 |
53 |
1 |
53 |
1 |
53 |
Dugout |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
Dam or stock dam |
7 |
45 |
7 |
45 |
7 |
49 |
6 |
44 |
Total |
347 |
535 |
310 |
524 |
209 |
495 |
142 |
444 |
tSuperscript t indicates tillage.
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