Inter- and Intraspecific Variation of Breeding Biology, Movements, and Genotype in Peregrine Falcon Falco Peregrinus and Gyrfalcon F. Rusticolus Populations in Greenland PDF Download
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Author: Kurt K. Burnham
Publisher:
ISBN:
Category : Gyrfalcon
Languages : en
Pages : 498
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Book Description
Author: Kurt K. Burnham
Publisher:
ISBN:
Category : Gyrfalcon
Languages : en
Pages : 498
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Book Description
Author: William A. Burnham
Publisher: Museum Tusculanum Press
ISBN: 9788763511629
Category : Science
Languages : en
Pages : 32
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Book Description
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: William A. Burnham
Publisher:
ISBN:
Category : Birds of prey
Languages : en
Pages : 118
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Author: Joseph James Hickey
Publisher:
ISBN:
Category : Nature
Languages : en
Pages : 660
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Proceedings of an international conference sponsored by the University of Wisconsin, 1965, with the support of The National Institutes of Health, Public Health Service, US Department of Health, Education and Welfare, The Rachel Carson Fund of The National Audubon Society, The Frank M. Chapman Fund of The American Museum of Natural History, The Harry Steenbock Fund of the Wisconsin Society for Ornithology.
Author:
Publisher:
ISBN:
Category : Birds of prey
Languages : en
Pages : 42
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Author: Andrew G. Gosler
Publisher: Museum Tusculanum Press
ISBN: 8763539004
Category : Science
Languages : en
Pages : 114
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This book covers the discovery and history of the most northern breeding population of Peregrine Falcons in the world, near Thule Air Base in northwest Greenland (75.9–77.6° N). Although the region was explored by scientific expeditions as early as 1818, Peregrines were not documented in the area until the 1930s. By the early 1990s the population had become well established, with a warming climate enabling Peregrines from further south to expand their breeding range northward. Here Burnham and his co-authors present their comprehensive findings on the biology and ecology of this population based on thirteen years of research from 1993 to 2005.
Author: Elizabeth-Noelle F. Morata
Publisher:
ISBN:
Category : Peregrine falcon
Languages : en
Pages : 81
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Book Description
Peregrine falcons (Falco peregrinus) are renowned for their migratory habits, with 'peregrinus' often translated as 'wanderer' or 'pilgrim'. However, their migratory habits may differ by population and some peregrine may falcons forgo migration when climate and resources remain stable. To examine peregrine falcon home range and space use, I fitted GPS-satellite transmitters to nine breeding adults in coastal northern California, an area with a mild climate and abundant waterbird populations. I used kernel density estimates and time-local convex hulls to examine seasonal home ranges and within-home range habitat use. All nine peregrine falcons remained resident in their territories year-round, and home ranges continued to center around the location of the nesting structure (i.e. bridge or cliff face) even during winter. Home range sizes were larger in the breeding season than in winter, indicating that peregrines did not need to travel farther to find food during the winter and that local conditions were conducive to year-round occupancy. Intensity of space use within the home range was influenced by several environmental covariates, including distance to water, distance to nest site, elevation, prey density, terrain ruggedness and habitat type. Peregrine falcons preferred habitat types associated with nest sites, where they remained year-round, and with open areas such as mud flats, beaches, some agricultural lands, and inland standing water. Intensity of use decreased with distance from bodies of water, distance from nest sites, and terrain ruggedness. Intensity of use was positively associated with elevation and an index of prey density. Our results demonstrate non-random space use within the home range and provide new information about previously unstudied non-migratory behaviors of coastal breeding peregrines in Humboldt County, California.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Tom J. Cade
Publisher:
ISBN:
Category : Nature
Languages : en
Pages : 1030
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Author:
Publisher:
ISBN:
Category : Peregrine falcon
Languages : en
Pages : 2
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