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

Appendix B, Table 4

Table 4. Frequency of eggshells of duck eggs depredated by predators of duck nests in the Prairie Pothole Region during 1972-92 with opening located in an end, side, or both (side-end).

			Location of openings (%)
Predator	Data type	No. eggshells^a	End	Side	Side-end
Coyote	Artificial Nest	75	0	97	3
Red fox	Artificial Nest	42	2	88	10
Raccoon	Artificial Nest	226	59	12	29
Striped skunk	Artificial Nest	136^b	14	50	36
	Natural Nest	48	4	48	48
American badger	Natural Nest	79	9	30	61
Mink	Loose egg	27	7	63	30
Weasels^c	Loose egg	13	38	23	38
Franklin's ground squirrel	Artificial Nest	31	13	23	65
Black-billed magpie	Artificial Nest	12	8	58	33
American crow	Artificial Nest	42	10	60	31
Gulls^d	Artificial Nest	26	0	96	4
	Loose egg	49	0	86	14

^a	Number of eggshells examined whose connected parts made up ≥50% of the intact shell of an egg.
^b	Excludes 70 eggs eaten by a captive striped skunk that opening 50% of eggs on an end, 16% on the side, and 34% on a side-end.
^c	Ermine and long-tailed weasel.
^d	Ring-billed gull and California gull.

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