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Author:
Publisher:
ISBN:
Category : Animals
Languages : en
Pages : 270
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Author: United States. Bureau of Sport Fisheries and Wildlife
Publisher:
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Category : Fisheries
Languages : en
Pages : 96
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"In the calendar year 1964, the main efforts of the Division of Wildlife Research were directed toward consolidation of recently expanded programs on pesticide-wildlife relations and nuisance-animal control. A modest increase in activities associated with the captive propagation of rare and endangered birds was accommodated, and a great deal of planning laid groundwork for future work with threatened species. There was no change in purpose and function of the Division"--Page 1
Author: United States. Bureau of Sport Fisheries and Wildlife
Publisher:
ISBN:
Category : Birds
Languages : en
Pages : 66
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Author:
Publisher:
ISBN:
Category : Animals
Languages : en
Pages : 270
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Author:
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ISBN:
Category : Wildlife conservation
Languages : en
Pages : 58
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Author:
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ISBN:
Category : Government publications
Languages : en
Pages : 1284
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Author: United States. Superintendent of Documents
Publisher:
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Category : United States
Languages : en
Pages : 1284
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Author:
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Category : Agriculture
Languages : en
Pages : 1542
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Author: James L. Ruos
Publisher:
ISBN:
Category : Bird populations
Languages : en
Pages : 638
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U.S. mourning dove population indexes increased by 4% from 1969 to 1970 in the Eastern Management Unit, but declined 2% in the Central Management Unit and 11% in the Western Management Unit. The changes were below the 10-year means, 1960-69, by 3% in the Eastern Unit, 15% in the Central, and 27% in the Western. Regression analyses of the call-count data for 1960-70 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, 3% a year in the Central, and 4% in the Western
Author: Gary A. Wobeser
Publisher: Springer Science & Business Media
ISBN: 1461559510
Category : Science
Languages : en
Pages : 318
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Management of wild waterfowl has become increasingly intensive. Many birds now hatch in managed nesting cover or in artificial nesting structures, use man-made wetlands, and winter on crowded refuges while consuming a grain diet The water they use is often limited in supply and may contain residues from its many prior users. Unfortunately, intensified management often results in new problems, among which disease is important There are many similarities between the current form of management used for some waterfowl and that used in domestic animals. In both, the objective is to maintain a healthy, productive population. Dealing with health problems in waterfowl will benefit from combining the skills of veterinary medicine and wildlife ecology. Revisiting this book after 15 years allowed me to consider changes at the interface between the two disciplines. Veterinary medicine traditionally has been concerned with the individual and with treating sick animals, while the ecologist is concerned with populations and the manager has limited interest in treating sick birds. During this period there has been a marked increase in awareness among veterinarians that they have a responsibility in wildlife and conservation biology. Curricula of many veterinary colleges now include material on non-domestic animals and attempt to put disease in an ecological context. Also during this time, waterfowl managers have become more aware of disease as a factor in population biology and there are early attempts to put numbers to "disease" in models of continental waterfowl populations.
Author:
Publisher:
ISBN:
Category : Animals
Languages : en
Pages : 260
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