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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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