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Description: |
iv, 40 pages : illustrations, maps ; 26 cm |
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Bibliography Note: |
Includes bibliographical references (pages 26-27). |
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Summary, Etc. Note: |
Abstract: U.S. mourning dove population indexes declined from 1970 to 1971 by 5% in the Eastern Management Unit, 4% in the Central Management Unit and by 2% in the Western Management Unit. The 1971 indexes were below the 10-year means, 1961-70, by 7% in the Eastern Unit, 15% in the Central, and 25% in the Western. Regression analyses of the call-count data for 1961-71 indicate a statistically significant downward trend in dove breeding populations in all management units; mean rates of decline were 1% a year in the Eastern Unit, 2.5% a year in the Central, and 4.4% in the Western. |