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Waterfowl Production on the Woodworth Station
in South-central North Dakota, 1965-1981

Table 42. Reduction of brood size of 12 duck species between
age classes for July and August counts,
Woodworth Study Area, 1965-81.

Table 42. Reduction of brood size of 12 duck species between age classes for July and August counts, Woodworth Study Area, 1965-81.

	Reduction of brood size from average age Class I to Class III ducklings
Species	Number	Percent
Dabbling ducks
Mallard	0.5	8
Gadwall	0.3^a	4^a
American wigeon	1.3	18
Green-winged teal	1.5	27
Blue-winged teal	1.0	14
Northern shoveler	0.8	14
Northern pintail	2.8	42
Total dabbling ducks	1.2	17
Diving ducks
Redhead	2.9	44
Canvasback	2.0	37
Lesser scaup	0.9^b	13^b
Ring-necked duck	2.0^b	33^b
Ruddy duck	0.6^b	12^b
Total diving ducks	1.5	25
All broods	1.1	16

^aBased on Class II brood size because of no sample of Class III broods.
^bAverage brood size increased between Classes I and II; no sample of Class III broods.

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Waterfowl Production on the Woodworth Station in South-central North Dakota, 1965-1981

Table 42. Reduction of brood size of 12 duck species between age classes for July and August counts, Woodworth Study Area, 1965-81.

Waterfowl Production on the Woodworth Station
in South-central North Dakota, 1965-1981

Table 42. Reduction of brood size of 12 duck species between
age classes for July and August counts,
Woodworth Study Area, 1965-81.