Impact of Red Fox Predation on the Sex Ratio of Prairie Mallards

Table 16: Sex Ratios of Prenesting Mallards in the Northern Prairie Region

Table 16. Sex ratios of prenesting mallards in the northern prairie region.

Source	Location	Date	Total Birds	Males:Females
Bellrose et al. (1961	Manitoba	15-30 April 1947	162	110:100
Bellrose et al. (1961	Manitoba	21-25 April 1949	829	117:100
Dzubin	Saskatchewan	(prenesting) 1956-59	1,032	112:100
M.C. Hammond (Unpublished data)^a	North Dakota	1-28 April 1939-52	3,320	108:100
M.C. Hammond (Unpublished data)^a	North Dakota	31 March-27 April 1959-64	2,494	129:100
L.M. Kirsch (Unpublished data)	North Dakota	15-28 April 1964-69	551	120:100

^a Data intermittent for years indicated.

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Next Section-- Table 17: Sex Composition of Mallards Found on Roads in Eastern North Dakota 1969-74