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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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