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Author:
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Category : Bird populations
Languages : en
Pages : 44
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Book Description
Mourning dove population indices, as determined from the nationwide Call-Count Survey, decreased from 1972 to 1973 by 7% in the Eastern Management Unit, by 8% in the Central Management Unit, but increased by 8% in the Western Management Unit. The 1973 indices were below the 10-year means, 1963-1972, by 9% in the Eastern Unit, 6% in the Central Unit, and 4% in the Western Unit. Regression analyses of the call-count data for 1963-73 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.
Author:
Publisher:
ISBN:
Category : Bird populations
Languages : en
Pages : 44
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Book Description
Mourning dove population indices, as determined from the nationwide Call-Count Survey, decreased from 1972 to 1973 by 7% in the Eastern Management Unit, by 8% in the Central Management Unit, but increased by 8% in the Western Management Unit. The 1973 indices were below the 10-year means, 1963-1972, by 9% in the Eastern Unit, 6% in the Central Unit, and 4% in the Western Unit. Regression analyses of the call-count data for 1963-73 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.
Author:
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ISBN:
Category : Birds
Languages : en
Pages : 36
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Book Description
Author: United States. Superintendent of Documents
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Category : Government publications
Languages : en
Pages : 1228
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Book Description
February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index
Author:
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ISBN:
Category : Wildlife conservation
Languages : en
Pages : 580
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Book Description
Author: U.S. Fish and Wildlife Service
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Category : Fishery management
Languages : en
Pages : 24
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Book Description
Author:
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ISBN:
Category : Government publications
Languages : en
Pages : 1626
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Book Description
Author: U.S. Fish and Wildlife Service
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ISBN:
Category : Animals
Languages : en
Pages : 732
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Author:
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ISBN:
Category : Wildlife conservation
Languages : en
Pages : 174
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Book Description
A bibliography comprising annotated citations of 2037 scientific and technical publications from ten series issued by the U.S. Fish and Wildlife Service. Includes a six-page introduction containing a history of the Service and a description of the research and development series.
Author: Richard C. Banks
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ISBN:
Category : Birds
Languages : en
Pages : 24
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Book Description
A relatively few species account for most of this mortality but continue to maintain large, harvestable populations, suggesting that the numbers of most bird species are essentially unaffected by the human activities discussed. Other activities of man that do not necessarily result in the death of birds but rather reduce reproductive potential are more likely to have long-term effects on avian populations.
Author:
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ISBN:
Category : Fisheries
Languages : en
Pages : 238
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Book Description
