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 21: Average Sex Ratios and Survival Rates Resulting From Various Settings of the Predictive Model

Table 21. Average sex ratios and survival rates resulting from various settings of the predictive model for Case I and Case II.
Sex ratio
Survival rate
Average
Response
Male
Female
I
II
I
II
I
II
I
II
Standard
119.2
117.0
-
-
.679
.679
.610
.618
F reduced
104.4
99.2
23.1
28.1
.687
.687
.671
.688
F increased
131.2
131.6
26.3
32.9
.673
.673
.564
.562
PM reduced
128.1
127.8
-14.8
-18.6
.674
.674
.577
.578
PM increased
108.8
104.2
-8.7
-10.9
.684
.684
.651
.667
r5 = 0%, r6 = 0%
158.0
155.4
-32.5a
-32.9a
.806
.806
.663
.668
r5 = 8%, r6 = 5%
135.4
132.8
-26.7a
-26.8a
.743
.743
.638
.644
r5 = 20%, r6 = 10%
107.9
105.6
-14.5a
-14.8a
.648
.648
.616
.624

a Response as measured relative to change in the difference between male and female hunting rates.

Previous Section-- Table 20: Parameters of Distributions Used to Generate Random Variates
Return to Contents

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/table21.htm
Page Contact Information: Webmaster
Page Last Modified: Saturday, 02-Feb-2013 05:56:45 EST
Menlo Park, CA [caww54]