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

Table 24. Summary of causes of duck nest losses,
Woodworth Study Area, 1966-81.

Table 24. Summary of causes of duck nest losses, Woodworth Study Area, 1966-81.
Species Losses (n) Mammal Bird Unknown predators Human-machine Weather Fire Unknown causes
Mallard 262 225 8 8 1 4 12 4
Gadwall 384 341 6 17 11 1 1 7
American wigeon 35 33 1 0 0 0 0 1
Green-winged teal 33 30 1 1 1 0 0 0
Blue-winged teal 1,409 1,237 28 58 36 0 28 22
Northern shoveler 119 95 2 9 7 0 5 1
Northern pintail 120 101 4 8 5 0 1 1
Lesser scaup 33 29 1 1 1 0 0 1
Total 2,395 2,091
(87%)		 51
(2%)		 106
(4%)		 69
(3%)		 2
(<1%)		 39
(2%)		 37
(2%)
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