OT 
Average Doves Heard Calling Per Route (Log Scale) 
30 
28 
26 
24 
22 
20 
18 
16 
14 
12 


Central Unit 
Neen ee EEE EIIEIEIIEIIIIIEINIEENNNEEENSEESieenememenmmenmeenet 
ie 
& 
& 
& 
Fa 
= a eg 
Mma mm t—i—tecd otateS UCU CSS 
———— — TT OT eg! ir es 
Eastern Unit a 
ea 
Eg = 
~~ A 33 oe =p 
Wester Unit 
Horizontal lines indicate 10-year (1961-1970) averages 
1961 1962 19630 1964 1965 1966 1967 1968 1969 1970 1971 
pulation indexes by management unit, 1961-1971 
Figure 7.--Breeding mourning dove p 

