USGS - science for a changing world

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
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M.C. Hammond (Unpublished data)a North Dakota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
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L.M. Kirsch (Unpublished data) North Dakota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

Take Pride in America logo USA.gov logo 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
Reston, VA [vaww55]