Wildlife Monographs
Red Fox Predation on Breeding Ducks
in Midcontinent North America
Tables
Table 2. Percentage species compositions of dabbling ducks identified at red fox rearing dens and in duck populations east and west of the Missouri River in North Dakota and South Dakota, 1968-73.
| East Rivera | West Rivera | ||||
| Dens | Populationb | Dens | Populationb | ||
| Identified ducks at dens (N) | 1452 | 113 | |||
| Species composition (%) | |||||
| Mallard | 20.3 | 17.0 | 67.3 | 40.4 | |
| Northern pintail | 23.1 | 19.7 | 20.4 | 10.1 | |
| Northern shoveler | 10.7 | 9.7 | 1.8 | 7.8 | |
| Blue-winged teal | 31.8 | 33.8 | 4.4 | 19.0 | |
| Gadwall | 9.2 | 15.6 | 2.7 | 8.8 | |
| American wigeon | 1.9 | 1.8 | 0 | 10.5 | |
| Green-winged teal | 3.0 | 2.3 | 3.5 | 3.5 | |
aEast river data are for 1968-73 (North Dakota) and 1968-70 (South Dakota); west river data are for 1968-70.
bAverage of annual USFWS Breeding Pair Surveys for Strata 46 and 48 (east river) and Strata 43 and 44 (west river) weighted by the percentage of total number of species-identified dabbling ducks found at dens in each area each year.
