Northern Prairie Wildlife Research Center


Home	About NPWRC	Our Science	Staff	Employment	Contacts	Common Questions	About the Site

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M.C. Hammond (Unpublished data)^a	North Dakota	1-28 April 1939-52	3,320	108:100
M.C. Hammond (Unpublished data)^a	North Dakota	31 March-27 April 1959-64	2,494	129:100
L.M. Kirsch (Unpublished data)	North Dakota	15-28 April 1964-69	551	120:100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.

Previous Section-- Table 15: Average Sex Ratio and Rates of "Other" Mortality
Return to Contents
Next Section-- Table 17: Sex Composition of Mallards Found on Roads in Eastern North Dakota 1969-74

Accessibility FOIA Privacy Policies and Notices

U.S. Department of the Interior | U.S. Geological Survey
URL: http://www.npwrc.usgs.gov/resource/mammals/sexratio/table16.htm
Page Contact Information: Webmaster
Page Last Modified: Saturday, 02-Feb-2013 05:56:39 EST
Menlo Park, CA [caww54]