Changes in Vegetation Structure in Seeded Nesting Cover in the Prairie Pothole Region PDF Download
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Author: Kenneth F. Higgins
Publisher:
ISBN:
Category : Grasses
Languages : en
Pages : 32
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Book Description
A sample of 365 stands of seeded nesting cover (mixtures of cool-season grasses and legumes) was studied in the glaciated prairie pothole region during 1977-79. Measurements of species composition, canopy cover, plant height, and visual obstruction values differed with stand age but only in a general way when results from over the entire region were pooled. Maximum values for plant height and visual obstruction occurred once per stand during the first 10 growing seasons. Although the year of maximum growth was variable and unpredictable, stands showed trends of degeneration in height and visual obstruction after the year of maximum growth.
Author: Kenneth F. Higgins
Publisher:
ISBN:
Category : Grasses
Languages : en
Pages : 32
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Book Description
A sample of 365 stands of seeded nesting cover (mixtures of cool-season grasses and legumes) was studied in the glaciated prairie pothole region during 1977-79. Measurements of species composition, canopy cover, plant height, and visual obstruction values differed with stand age but only in a general way when results from over the entire region were pooled. Maximum values for plant height and visual obstruction occurred once per stand during the first 10 growing seasons. Although the year of maximum growth was variable and unpredictable, stands showed trends of degeneration in height and visual obstruction after the year of maximum growth.
Author: Northern Prairie Wildlife Research Center
Publisher:
ISBN:
Category :
Languages : en
Pages : 32
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Book Description
Author: Northern Prairie Wildlife Research Center
Publisher:
ISBN:
Category : Prairies
Languages : en
Pages : 56
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Book Description
Author:
Publisher:
ISBN:
Category : Forest management
Languages : en
Pages : 318
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Book Description
Author:
Publisher:
ISBN:
Category : Forest management
Languages : en
Pages : 704
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Book Description
Author:
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 558
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Book Description
Author: Jerome H. Stoudt
Publisher:
ISBN:
Category : Bird populations
Languages : en
Pages : 40
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Book Description
A study of canvasback (Aythya valisineria) breeding populations, nest success, productivity, and habitat requirements was conducted from 1961 to 1972 on a 181.3 square kilometer area south of Minnedosa, Manitoba.
Author: Sonoma S. Wilson
Publisher:
ISBN:
Category : Avian botulism
Languages : en
Pages : 16
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Book Description
This bibliography, first compiled in 1970 and published in response to many requests for information on avian botulism, has been updated to include the literature published through 1980. In general only, articles dealing primarily with the avian disease are included, as opposed to those concerned with the various aspects of the biology of Clostridium botulinum, either type C or type E.A few exceptions, such as Bengtson's report of the first isolation and description of the type C organism, are included for their historical interest. Progress reports and other administrative documents not available for distribution on request are excluded, as are textbook accounts, which are generally summaries of work published elsewhere. This bibliography was a cooperative effort by the National Wildlife Laboratory, U.S. Fish and Wildlife Service, and the U.S. National Park Service, which provided partial funding for the work. Although there was an attempt to list every important reference, no claim to complete coverage of the published literature is made and the authors will be grateful to users of the bibliography who call attention to errors or omissions.
Author: Curtice R. Griffin
Publisher:
ISBN:
Category : Bald eagle
Languages : en
Pages : 20
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Book Description
Bald eagles (Haliaeetus leucocephalus) associate with wintering waterfowl concentrations throughout the United States, but little detailed information is available on eagle-waterfowl relations. This report concerns the ecology of bald eagles wintering in the vicinity of Swan Lake National Wildlife Referenc in north-central Missouri and, more specifically, examines the association of the eagles with waterfowl during the winters of 1975-76, 1976-77, and 1977-78
Author: Leigh M. Couling
Publisher:
ISBN:
Category : Hunting surveys
Languages : en
Pages : 298
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Book Description
A mail questionnaire survey of waterfowl hunters is conducted each year in the United States to provide information on waterfowl kill and hunter activity. We carried out a study using data from the 1971-73 and 1972-73 hunting seasons to determine the effectiveness of the present U.S. sampling and estimation techniques, and a number of modifications in both sampling and analysis is recommended.
