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

Table 15: Average Sex Ratio and Rates of "Other" Mortality


Table 15. Average sex ratio and rates of "other" mortality resulting from small changess in the input parameters. The "response" value, a measure of the influence of in input parameter on the output variable, is defined in the text (page 15).a
Sex ratio
Male "other" (r9)
Female "other" (r10)
Average
Response
Average
Response
Average
Response
Standard
125.9
-
.1193
-
.1270
-
F
-10%
125.9
0%
.1230
-31.0%
.1353
-65.4%
+10%
125.9
0
.1156
-31.0
.1199
-55.9
PM
-10%
125.9
0
.1152
34.4
.1192
61.4
+10%
125.9
0
.1227
28.5
.1345
59.1
Surface mallards
-10%
125.9
0
.1230
-31.0
.1353
-65.4
+10%
125.9
0
.1156
-31.0
.1199
-55.9
Percent detectable
-10%
125.9
0
.1152
34.4
.1192
61.4
+10%
125.9
0
.1227
28.5
.1345
59.1
Percent to dens
-10%
125.9
0
.1152
34.4
.1192
61.4
+10%
125.9
0
.1227
28.5
.1345
59.1
Number of dens
-10%
125.9
0
.1230
-31.0
.1353
-65.4
+10%
125.9
0
.1156
-31.0
.1199
-55.9
Sex ratio at dens (% female)
-10%
125.9
0
.1056
114.8
.1357
-68.5
+10%
125.9
0
.1334
118.2
.1203
-52.8
Survival rate
male -10%
99.3
18.3
.1887
-50.3
.1390
-8.2
male +10%
172.5
33.0
.0524
-50.0
.1149
-8.5
female -10%
154.5
22.0
.1193
0
.1883
47.1
female +10%
101.4
19.0
.1193
0
.0717
42.5
both -10%
119.6
37.9
.1887
-440.0
.1984
-425.3
both +10%
134.9
70.9
.0524
-556.3
.0574
-574.9
Recovery rate
male -10%
125.9
0
.1320
-106.5
male +10%
125.9
0
.1063
-109.0
female -10%
125.9
0
.1349
-62.2
female +10%
125.9
0
.1190
-63.0
Crippling loss
-10%
125.9
0
.1212
-15.9
.1282
-9.4
+10%
125.9
0
.1174
-15.9
.1259
-8.7
Reporting rate
-10%
125.9
0
.1065
107.3
.1194
59.8
+10%
125.9
0
.1297
87.2
.1332
48.8
BOUND
-10%
125.9
0
.1193
0
.1352
-64.6
+10%
125.9
0
.1193
0
.1196
-58.3
Alpha = 1.0
125.9
0
.0808
-
.0872
-
Recruitment sex ratio
90:100
113.4
99.3
.1193
0
.1332
48.8
110:100
138.4
99.3
.1193
0
.1215
43.3

a Response values for survival rates are measured with respect to the difference in male and female rates.


Previous Section-- Table 14: Average Rates of Mortality From Various Causes
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Next Section-- Table 16: Sex Ratios of Prenesting Mallards in the Northern Prairie Region

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