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Interpreting Evidence of Depredation of Duck Nests in the Prairie Pothole Region

Appendix B, Table 6

Table 6. Distribution of eggshells by distance intervals at duck nests depredated by the principal predators of duck nests in the Prairie Pothole Region, 1972-92.
        Eggshell (%) by distance intervals from nest
Predator Nest typea No. nests No. eggshells ≤20 cmb >20 cm - 1 m >1 - 2 m >2 - 3 m
Coyote Artificial 59 129 23 52 16 9
Red fox Artificial 152 1c 0 0 0 0
  Natural 1 0 0 0 0 0
Raccoon Artificial 28 144 64 32 3 1
Striped skunk Artificiald 30 151 72 25 3 1
American badger Natural 61 173 43 46 9 2
Minke              
Weaselse,f              
Franklin's ground squirrel Artificial 15 35 43 26 29 3
Black-billed magpie Artificial 24 23 65 4 27 4
American crow Artificial 51 61 52 31 10 7
Gullsg Artificial 14 26 81 12 8 0
a All nests had ≥6 eggs when last visited by an investigator before nest was destroyed.
b Includes eggshells in nests.
c Only 1 eggshell was found at the nest and the distance interval was not recorded.
d Excludes eggs from 16 nests depredated by a striped skunk that had a den near the nests and exhibited unusual behavior by taking many eggs from the nest sites toward or to the den.
e No data available.
f Ermine and long-tailed weasel.
g Ring-billed gull and California gull.
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