Download or read book Breeding Biology and Ecology of the Peregrine Falcon Falco Peregrinus in West Greenland written by William A. Burnham and published by . This book was released on 1975 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biology of the Peregrine and Gyrfalcon in Greenland written by William A. Burnham and published by Museum Tusculanum Press. This book was released on 1984 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book The History and Range Expansion of Peregrine Falcons in the Thule Area Northwest Greenland written by Andrew G. Gosler and published by Museum Tusculanum Press. This book was released on 2012-07-01 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Inter and Intraspecific Variation of Breeding Biology Movements and Genotype in Peregrine Falcon Falco Peregrinus and Gyrfalcon F Rusticolus Populations in Greenland written by Kurt K. Burnham and published by . This book was released on 2007 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Special Scientific Report written by and published by . This book was released on 1981 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Status Report on the Peregrine Falcon Falco Peregrinus in Canada written by Marilyn Martin and published by . This book was released on 1990 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Special Scientific Report wildlife written by and published by . This book was released on 1982 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Special Scientific Report wildlife written by U.S. Fish and Wildlife Service and published by . This book was released on 1982 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Gyrfalcon written by Eugene Potapov and published by A&C Black. This book was released on 2010-01-29 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Peregrine Falcon Populations written by Joseph James Hickey and published by . This book was released on 1969 with total page 660 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book The Peregrine Falcon in Greenland written by James T. Harris and published by . This book was released on 1981 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Status Reports on Twelve Raptors written by David Lawrence Evans and published by . This book was released on 1982 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: Depletion of fisheries due to acid rain may pose a future threat to bald eagle and osprey populations in some regions. Loss of essential habitat has affected declines in the caracara and western burrowing owl and the disappearance of the norther aplomado falcon from the southern United States. Most populations of the ferruginous hawk, marsh hawk, and prairie falcon appear stable; habitat loss is the most critical factor in population changes.
Download or read book Behavioural Ecology of Western Palearctic Falcons written by Giovanni Leonardi and published by Springer Nature. This book was released on 2020-12-07 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph is the result of eight years of bibliographical and field research concerning several behavioural ecology aspects of the Palaearctic falcons. For a while, this book grew along with “The Lanner falcon” published in 2015 and revised in 2017. In both books the main aim was to provide a clear overview of the biology and ecology of these species. In fact in the last 20 years, the number of publications on falcons has grown tremendously and, in parallel, also those belonging to the so-called "grey literature". The number of people involved is also increased by including both academics and nature lovers. Many previously published books emphasized identification, and offered little insights on the behavioural and ecological aspects of the species. Very often, the research on behavioural ecology remains closed within the confines of academic community. By contrast, a multitude of basic data is scattered in countless articles published in local magazines. Many falcon species are easy to observe and study (such as kestrels) but others are more rare and localized. In order to understand the survival strategies adopted by this group of avian predators, it is necessary not to lose sight of the overall picture. This book tries to explain the different survival strategies by examining, through a few essential chapters, some crucial aspects for all species. The first chapter provides information on the genus Falco, its genetics, evolution and morphological peculiarities. The other chapters deal with reproductive strategies, competition, exploitation of resources, dispersal patterns, communication and sociality. One of the main objectives of this book is to produce an accessible but scholarly curated source of reference. By understanding the most common species, it is possible to provide a working framework for rarer, and especially threatened, falcon species.
Download or read book Foraging Ecology of the Arctic Peregrine Falcon Falco Peregrinus Tundrius written by Barry Glen Robinson and published by . This book was released on 2015 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: Specialist predators with a limited diet may be less adaptable to environmental change than generalists, which consume a diversity of prey. As the climate changes, ecological homogenization is occurring, where generalist species outcompete specialists, reducing ecosystem complexity. In Arctic ecosystems, temperatures are rising at almost twice the rate of the rest of the planet and summer rainfall has increased significantly over the last century. Arctic peregrine falcons (Falco peregrinus. tundrius) breeding throughout the circumpolar regions of Canada, the USA, and Greenland have a diversity of prey species to choose from, but little is known about how they select for these resources as prey populations fluctuate. To fully appreciate the potential implication of climate change on Arctic peregrine falcon populations, research investigating prey selection and the potential for peregrines to switch to alternative prey is needed. In this dissertation I studied an Arctic tundra ecosystem around Igloolik, Nunavut, and related spatiotemporal variations in all prey species consumed by peregrines to annual variation in weather, while simultaneously monitoring peregrine diet and reproductive output. First, I investigated the relationship between annual variation in weather and spatiotemporal variation in the abundance of multiple avian guilds: songbirds (Passeriformes), shorebirds (Scolopacidae and Charadriidae), gulls (Laridae and Sternidae), loons (Gaviiformes), geese and ducks (Anatidae), and black guillemots (Cepphus grylle). I spatially stratified my study area and conducted distance sampling to estimate strata-specific densities of each guild during the summers of 2010-2012 while also monitoring temperature and rainfall. Shorebirds, songbirds and gulls were less abundant in 2012, which was a cool and wet summer, relative to 2010 and 2011. I monitored annual variation in lemming abundance using snap trapping and assumed spatial variation in lemming density was proportional to spatial variation in the density of lemming burrows observed while surveying distance sampling transects. Lemming density was at least 25 times higher in 2011 than in 2010 and 2012. I quantified peregrine nestling diet using a combination of two methods: direct observations from motion-sensitive cameras at nest sites and stable isotope analysis. I developed a novel method of incorporating unidentified food items from nest camera images into diet estimates and quantifying error around these estimates for individual nests, which were used as informative prior hypotheses in Bayesian mixing models predicting nestling diets. I used stable isotope signatures of falcon nestling plasma and prey tissues samples as inputs for Bayesian mixing models. When informative priors were included, the resulting diet estimates from mixing models had narrow credible intervals and generally reflected the prior hypotheses. Nestling diets were dominated by songbirds and shorebirds (insectivorous birds), which generally contributed > 80% of total diet. The use of ducks and marine prey (gulls and black guillemots) was somewhat limited, but these prey contributed up to 50% of nestlings' diet in nests with more access to marine habitat. Lemmings were generally not used while they were scarce in 2010 and 2012, but they contributed 20-50% of nestlings' diet during the lemming peak in 2012. Next, I investigated whether peregrines switched to alternative prey when their primary prey of insectivorous birds declined by examining the functional response of falcons to changes in prey density. I also compared peregrine nestling survival across all years of the study to determine if reproductive output was influenced by prey density and prey intake rates. Peregrine falcons exhibited a functional response to lemmings, ducks and total prey density: intake rates decreased when prey densities declined in 2012. The number of fledglings produced per nest also declined in 2012, indicating there was a fitness consequence of declining prey densities and intake rates. Finally, I compared the proportional availability of each prey type to its proportional contribution to peregrine falcon diets and calculated selection ratios for each prey type. Peregrine falcons selected for insectivorous birds and avoided lemmings. There was no evidence that peregrines switched to alternative prey when insectivorous birds declined. Results from my research indicated that Arctic peregrine falcons specialize on insectivorous birds and use alternative prey only opportunistically to supplement their diet.
Download or read book The Allotetraploid Saxifraga Nathorsti and Its Probable Progenitors S Aizoides and S Oppositifolia written by Tyge Böcher and published by . This book was released on 1983 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Working Bibliography of the Peregrine Falcon written by Richard D. Porter and published by . This book was released on 1987 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Seasonal Home Range Variation and Spatial Ecology of Peregrine Falcons Falco Peregrinus in Coastal Humboldt County CA written by Elizabeth-Noelle F. Morata and published by . This book was released on 2018 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
