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Wildlife Monographs

Red Fox Predation on Breeding Ducks
in Midcontinent North America

Tables

Table 9. Vulnerability indicesa for dabbling ducks in Barnes, Kidder, and Stutsman counties, North Dakota, 1969-73b.

1969 1970 1971 1972 1973 Avg.
Total dens 102 81 94 98 126  
All dabbling ducksc
Population (x 103) 878 666 629 651 423 649
Predation rate 2.76 1.83 1.16 1.60 0.96 1.66
Vulnerability index 3.14 2.75 1.84 2.46 2.27 2.27
Mallard
Population (x 103) 114 129 111 94 103 110
Predation rate 0.33 0.36 0.22 0.30 0.22 0.29
Vulnerability index 2.89 2.79 1.98 3.19 2.13 2.60
Northern pintail
Population (x 103) 195 145 81 145 61 125
Predation rate 0.69 0.42 0.29 0.37 0.18 0.39
Vulnerability index 4.61 2.90 3.58 2.55 2.95 3.32
Northern shoveler
Population (x 103) 73 77 39 74 31 59
Predation rate 0.35 0.21 0.09 0.11 0.05 0.16
Vulnerability index 4.79 2.73 2.31 1.49 1.61 2.59
Blue-winged teal
Population (x 103) 333 174 281 199 149 227
Predation rate 0.65 0.28 0.29 0.33 0.19 0.35
Vulnerability index 1.95 1.61 1.03 1.66 1.26 1.50
Gadwall
Population (x 103) 117 111 104 104 71 101
Predation rate 0.20 0.19 0.14 0.26 0.14 0.19
Vulnerability index 1.71 1.71 1.35 2.50 1.97 1.85

aFox predation rate index/duck population index X 103
bDabbling duck population estimates from USFWS Breeding Pair Surveys for Stratum 46.
cAll species listed plus American wigeon, green-winged teal, wood duck, and all unidentified dabbling ducks.

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