Author: William John Richardson
Publisher:
ISBN:
Category : Birds
Languages : en
Pages : 148
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Book Description
Report analyzing data collected during 1972 and 1974 on the movements and distributions of seabirds in the southeastern portion of the Beaufort Sea.
Author: Eberhard Gwinner
Publisher: Springer Science & Business Media
ISBN: 3642745423
Category : Science
Languages : en
Pages : 436
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Book Description
E. GWINNER! The phenomenon of bird migration with its large scale dimensions has attracted the attention of naturalists for centuries. Worldwide billions of birds leave their breeding grounds every autumn to migrate to areas with seasonally more favor able conditions. Many of these migrants travel only over a few hundred kilo meters but others cover distances equivalent to the circumference of the earth. Among these long-distance migrants are several billion birds that invade Africa every autumn from their West and Central Palaearctic breeding areas. In the Americas and in Asia the scope of bird migration is of a similar magnitude. Just as impressive as the numbers of birds are their achievements. They have to cope with the enormous energetic costs of long-distance flying. particularly while crossing oceans and deserts that do not allow replenishment of depleted fat reserves. They have to appropriately time the onset and end of migrations. both on a daily and annual basis. And finally. they have to orient their migratory movements in space to reach their species- or population-specific wintering and breeding grounds, irrespective of the variable climatic conditions along their migratory routes.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 556
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Book Description
Author:
Publisher:
ISBN:
Category : Oil and gas leases
Languages : en
Pages : 582
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Book Description
Author:
Publisher:
ISBN:
Category : Continental shelf
Languages : en
Pages : 504
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 356
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Book Description
Author: Paul R. Becker
Publisher:
ISBN:
Category : Environmental impact analysis
Languages : en
Pages : 314
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 744
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Book Description
Author: Jonathan Robert Bart
Publisher: Univ of California Press
ISBN: 0520273109
Category : Medical
Languages : en
Pages : 320
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Book Description
"/i/Arctic Shorebirds in North America//i/ represents a study that is one of the remarkable achievements of wildlife fieldcraft, like those done by Aldo Leopold in the 1930s and by the Craighead Brothers in the 1960s. To conduct a study of this scientific caliber in the great expanse and harsh climate of the Arctic makes it one of the great wildlife investigations whose value will only grow with time."--Larry Niles, Conserve Wildlife Foundation of New Jersey "It is most timely that Jonathan Bart and Victoria Johnston have gathered information on shorebirds that breed in the Arctic regions of North America. Data on these birds is generated at a wide range of locations by many different individuals and teams, and this book puts it into perspective. It is particularly valuable to have this treatise when so many shorebird species worldwide are in marked decline."--Clive Minton, Australasian Wader Studies Group "When the PRISM program for pan-Arctic shorebird monitoring was introduced, everyone agreed with its laudable aims, but it seemed impractical. How could shorebird biologists with limited time and resources acquire robust data on the size and trend of shorebird populations across the American Arctic? Now, the credibility gap has been bridged. /i/Arctic Shorebirds in North America//i/ presents the rigorous, practical methods that will be the foundation of Arctic shorebird monitoring for years to come. I look forward to Arctic PRISM becoming the keystone of shorebird conservation in the Western Hemisphere."--Humphrey Sitters, editor of /i/Wader Study Group Bulletin//i/
Author: Pamela H. Sinclair
Publisher: UBC Press
ISBN: 0774844345
Category : Nature
Languages : en
Pages : 597
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Book Description
The Yukon is a land of remarkable wilderness, diverse ecosystems, and profound beauty. It is also home to a unique assemblage of birds. As of 2002, 288 bird species have been documented in the Yukon, with 223 occurring regularly. They occupy an amazing range of habitats, from the most barren mountain peaks to lush valley bottom forests, and are an integral part of the cultural heritage of Yukon First Nations people. The vast areas of natural habitat with limited road access can make the study of birds challenging, but are key in defining the nature of birding in the Yukon. Birds of the Yukon Territory is the result of a decade-long project initiated to gather and share what is known about the Yukon's birdlife. Lavishly illustrated with 600 colour photographs and 223 hand-drawn bird illustrations, the book presents a wealth of information on bird distribution, migration and breeding chronology, nesting behaviour, and habitat use, and on conservation concerns. Two hundred and eighty-eight species of birds are documented, including 223 regular species, and 65 casual and accidental species. In compiling this meticulously researched volume, the authors consulted over 166,000 records in a database created by the Canadian Wildlife Service, with information dating back to 1861. S ections on birds in Aboriginal culture and history, and bird names in the Yukon First Nations and Inuvialuit languages, enhance the book, as do the numerous easily interpreted charts and graphs. Destined to become a basic reference work on the avifauna of the North, Birds of the Yukon Territory is a must-have for bird enthusiasts and anyone interested in the natural history of the Yukon and the North.
