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Author : Tom J. Cade
Publisher : Unknown
Page : 124 pages
File Size : 53,8 Mb
Release : 1960
Category : Animal populations
ISBN : OCLC:1301349
Author : William A. Burnham,William G. Mattox
Publisher : Museum Tusculanum Press
Page : 32 pages
File Size : 42,5 Mb
Release : 1984
Category : Science
ISBN : 8763511622
A ten year study began in 1972 in West Greenland to investigate the breeding biology of the peregrine falcon. Data on nesting gyrfalcons were also collected. Thirty-four peregrine nesting sites were examined in the 6050 km2 inland study area near Søndre Strømfjord. Limited research also centered in Disko Bugt and Frederikshåb. Peregrines were found nesting predominantly on high, south-facing cliffs, which overlooked large areas. The mean minimum distance between peregrine eyries was 7.7 km for the inland area (1972 and 1973) and 55 km for the coast (1974). Approximately 60 percent of the inland nesting sites were occupied each year. A ten-year average production of 1.90 young per occupied site and 2.78 young per successful site was determined. Lapland longspurs, snow buntings, wheatears, and redpolls comprised 90 percent of the peregrines diet. Raven nests and prey availability may be the most significant factor affecting falcon density. Addled peregrine eggs, eggshell fragments, and peregrine prey species were collected. Whole eggs averaged 14.3 ppm wet weight (305 ppm lipid weight ) DDE, while eggshell measurements showed a 16 percent thinning compared with pre-1940 eggs from Greenland. Prey species carried low levels of DDE. The peregrine population appears to be at a near critical contamination level, and a small increase in DDE level could contribute to a population decline. No indication of a decline has been observed during the study, and the population appears stable. The project banded 185 peregrines, from which 8 recoveries occurred. The recoveries suggest peregrines migrate south to winter in South America.
Author : Ian Newton
Publisher : A&C Black
Page : 432 pages
File Size : 41,7 Mb
Release : 2010-11-30
Category : Nature
ISBN : 9781408138557
Dr Newton's book is concerned with all aspects of population regulation in diurnal birds of prey, their social behaviour, dispersion, numbers, movements, breeding and mortality. He has drawn on his own studies in Scotland and on material and investigations worldwide to produce an authoritative and stimulating synthesis of current thinking and research on the ecological problems of the Falconiformes. He also deals in detail with the effects of pesticides and other pollutants on these birds, and with their scientific management and conservation. The author's lucid style will ensure a wide readership among research workers and the more general audience with an interest in birds of prey. There is a full bibliography and an extensive appendix of tables.
Author : Norman Barichello
Publisher : FriesenPress
Page : 183 pages
File Size : 47,9 Mb
Release : 2020-03-13
Category : Nature
ISBN : 9781525551048
Gyrfalcons and humans have shared a remarkable relationship since prehistoric times. These extraordinary arctic falcons have been revered, coveted as an item of commerce, persecuted, and enjoyed as a spectacle of sport for at least ten thousand years. Today, climate change has brought new challenges, with habitat in the far north changing rapidly as natural cycles begin to break down. Drawn from over thirty years of study and observation, this in-depth study provides a comprehensive view of the gyrfalcon’s place in the arctic ecosystem, including their inextricable link to their primary pray, the ptarmigan, and their antagonistic relationship with golden eagles. It explores the connection the bird has had with humanity in both legend and practice, and the challenges it faces as its habitat continues to change. This definitive look at the gyrfalcon shows us both sides of the majestic bird: the master of its domain and a threatened species facing an uncertain future.
Author : Eugene Potapov,Richard Sale
Publisher : Bloomsbury Publishing
Page : 304 pages
File Size : 50,9 Mb
Release : 2010-06-30
Category : Nature
ISBN : 9781408133095
WINNER OF THE WILDLIFE SOCIETY'S 'BEST SCIENCE BOOK 2006' AWARD This book is the first monograph on one of the most beautiful and admired birds in the world. The Gyrfalcon is the world's largest and most powerful falcon - a truly awe-inspiring bird which inhabits the ferociously inhospitable Arctic taiga, from Greenland and Iceland right across Siberia and northern Canada. Its plumage varies from a dark mottled grey to pure white - the white birds in particular are coveted by birders and falconers. Like other titles in the series, it covers all aspects of the species' biology, taxonomy, distribution, status and historical associations with mankind. The result is an exhaustively researched and enthrallingly readable biography of a spectacular bird, illustrated throughout with photographs and line drawings.
Author : United States. Congress. House. Committee on Merchant Marine and Fisheries
Publisher : Unknown
Page : 1954 pages
File Size : 46,6 Mb
Release : 1971
Category : Electronic
ISBN : UOM:39015018401839
Author : U.S. Tundra Biome Program
Publisher : Unknown
Page : 294 pages
File Size : 51,6 Mb
Release : 1971
Category : Mountain ecology
ISBN : OSU:32435063467781
Author : U.S. Fish and Wildlife Service
Publisher : Unknown
Page : 204 pages
File Size : 54,6 Mb
Release : 1986
Category : Arctic National Wildlife Refuge (Alaska)
ISBN : STANFORD:36105043959373
Author : Mark R. Fuller
Publisher : Unknown
Page : 30 pages
File Size : 49,6 Mb
Release : 1987
Category : Birds of prey
ISBN : IND:30000065720660
Author : Anonim
Publisher : Unknown
Page : 408 pages
File Size : 49,7 Mb
Release : 1982
Category : Government publications
ISBN : UOM:39015022262003
Author : Anonim
Publisher : Unknown
Page : 408 pages
File Size : 53,8 Mb
Release : 1983
Category : Electronic
ISBN : NWU:35556030600464
Author : Carol Snow
Publisher : Unknown
Page : 46 pages
File Size : 43,9 Mb
Release : 1972
Category : Endangered species
ISBN : UOM:39015018210461
The objective of this report is to provide BLM [Bureau of Land Management] personnel with the latest and most up-to-date information on rare or endangered species occurring on the public domain.
Author : Anonim
Publisher : Unknown
Page : 632 pages
File Size : 50,6 Mb
Release : 1998
Category : Electronic
ISBN : NWU:35556031211949
Author : United States. Bureau of Land Management
Publisher : Unknown
Page : 874 pages
File Size : 52,8 Mb
Release : 1976
Category : Natural gas
ISBN : UCR:31210025961341
Author : United States. EIS Task Force
Publisher : Unknown
Page : 884 pages
File Size : 48,9 Mb
Release : 1976
Category : Environmental impact statements
ISBN : STANFORD:36105002889280
