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Summary, Etc. Note: |
Abstract: Mourning dove population indices, as determined from the nationwide Call-Count Survey, increased from 1971 to 1972 by 2% in the Eastern Management Unit, by 17% in the Central Management Unit, and by 12% in the Western Management Unit. The 1972 indices were below the 10-year means, 1962-1971, by 3% in the Eastern Unit and 13% in the Western Unit, but were 2% above the 10-year mean in the Central Unit. Regression analyses of the call-count data for 1962-72 indicate a statistically significant downward trend in dove breeding populations in all management units; mean rates of decline per year were 1% in the Eastern, 2% in the Central and 4% in the Western Unit. |