20 

Fig. 20. Relative frequencies of recovery in Mexico for adult mourn- 
ing doves banded in designated areas of the Central Manage- 
ment Unit. Example: An individual dove banded in Missouri, 
Arkansas, or South Texas is eight times less likely to be recovered 
in Mexico than a dove banded in any of the remaining CMU 
States (8/1 = 8). 
Kansas, New Mexico, Oklahoma, Arkansas, North Texas, 
and South Texas. 
Tendency for adult doves to migrate to Mexico. — Adult 
doves banded in each of two groups of CMU States had 
a different likelihood of being recovered in Mexico. No dif- 
ferences were detected for Missouri, Arkansas, and South 
Texas as a group, nor for the remaining CMU States as a 
group. The combined recovery rate index for Missouri, 
Arkansas, and South Texas was 1.67 (CRF = 1) and 13.68 
(CRF = 8) for the remaining CMU States. The probability 
of being recovered in Mexico was eight times greater for 
an adult dove banded in Montana, North Dakota, Minne- 
sota, South Dakota, Wyoming, Nebraska, Iowa, Kansas, 
Colorado, New Mexico, Oklahoma, and North Texas than 
an adult banded in Missouri, Arkansas, and South Texas 
(Fig. 20), 
Tendency for immature doves to migrate to Mexico. — 
Tests for independence of immature doves being recovered 
in Mexico indicated an alignment of CMU banding States 
similar to that for adults. The only exception was that for 
immatures, Iowa fell into the group with Missouri, 
Arkansas, and South Texas. The combined recovery rate 
index for these States was 10,06 (CRF = 1): for the 
remaining CMU States, it was 32.96 (CRF = 3). There- 
fore, an immature dove banded in Iowa, Missouri, 
Arkansas, and South Texas was one-third as likely to be 
recovered in Mexico as an immature dove banded in the 
remaining CMU States (Fig. 21), 
Fig. 21. Relative frequencies of recovery in Mexico for immature 
mourning doves banded in designated areas of the Central 
Management Unit. Example: An individual dove banded in 
Iowa, Missouri, Arkansas, or South Texas is three times less likely 
to be recovered in Mexico than a dove banded in any of the 
remaining CMU States (3/1 = 3). 
Age and Sex Differences 
The migrational corridors of adult vs. immature and 
male vs. female doves from their respective States of band- 
ing appear to be similar in that all doves, regardless of age 
or sex, follow the same routes from specific areas of origin 
(Tables A-14 to A-23), However, differences among age and 
sex cohorts in proportions of recoveries obtained from spe- 
cific harvest areas appear to vary along these corridors, This 
fact suggests either that migrational timing is different or 
that the relative proportions of migratory to non-migratory 
segments are different among age and sex classes. 
Distributional differences within age and sex cohorts were 
examined by comparing the numbers of direct recoveries 
inside State of banding with those outside State of band- 
ing (adults vs. immatures and adult males vs. adult 
females). Data from each hunting State (all years pooled) 
were subjected to the Z-test, Z = P—Ps/,/PO(1/n, + I/ng) 
(Snedecor and Cochran 1967:221). The composite test sta- 
tistic was derived by summing the Z-values and dividing 
by the square root of the number of States used. The null 
hypothesis was that the proportion of direct recoveries of 
adult doves occurring inside State of banding was the same 
as that of immature doves. A similar hypothesis was tested 
for adult males vs. adult females, 
Adults vs. immatures.—The percentage of direct re- 
coveries occurring in State of banding was higher for adults 
than immatures in seven of the eight areas examined 
