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

Appendix B, Table 5


Table 5. Frequency of depredated duck nests by classes of percentage of nest material displacement for principal predators of duck nests in the Prairie Pothole Region, 1972-92.
      Frequency (%) of depredated nests by classes of percent of nest material displaced
Predator Nest typea No. nests 0 1-10 11-30 31-50 51-70 71-90 91-100
Coyote Artificial 59 8 12 12 2 3 14 49
Red fox Artificialb 14 50 7 14 21 0 7 0
Raccoon Artificial 28 64 18 11 7 0 0 0
Striped skunk Artificial 46 9 7 7 28 20 20 11
American badger Natural 61 13 11 23 13 2 13 25
Mink Natural 31 65 23 10 3 0 0 0
Weaselsc Natural 38 100 0 0 0 0 0 0
Franklin's ground squirrel Artificial 15 0 20 13 33 0 20 13
Black-billed magpie Artificial 24 0 13 8 8 13 46 13
American crow Artificial 51 10 14 14 12 6 27 18
Gullsd Artificial 14 71 21 7 0 0 0 0
a All nests were in uplands or dry wetlands and were known or thought to have ≥6 eggs when last visited by an investigator before nest was destroyed.
b Includes 1 natural nest with 5% of nest material deplaced.
c Ermine and long-tailed weasel; data from Fleskes (1988).
d Ring-billed gull and California gull.

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