Download or read book American Kestrel Nestlings written by James R. Klucsarits and published by . This book was released on 2007-01-01 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ectoparasites of American Kestrel Nestlings in Northern New Jersey and Their Relationship to Nestling Growth and Breeding Success written by Mark Joseph Lesko and published by . This book was released on 2011 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Trends in Nestling Body Size in a Declining Population of American Kestrels written by Kristina M. Ollo and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: American Kestrels (Falco sparverius) are small falcons that feed primarily on large insects but also small mammals and birds. During recent decades kestrel populations have been declining in North America, for reasons still unknown. One plausible explanation is that nestlings are becoming malnourished over the years from lack of food resources and are fledging at smaller sizes. Fledging at a smaller size puts kestrel nestlings at greater risk of post-fledging mortality due to starvation or predation. Here we examined long-term trends in the morphological development of American Kestrel nestlings to see if there have been any significant changes over time. We used about thirty years of measurement data from New Jersey and Pennsylvania nest box programs to explore this possibility. In New Jersey, wing length for females increased and wing length for males decreased. Body weight and body condition (wing length/body weight) did not change significantly over time in New Jersey. However, in Pennsylvania nestlings decreased in size, both in wing length and body weight. Moreover, body weight in Pennsylvania decreased disproportionately such that there also was a significant decrease in body condition. Decrease in body weight and body condition possibly could be caused by malnutrition from declines in insect populations, such as grasshoppers. The decrease also may be from exposure to contaminates such as pesticides. Evidence of American Kestrel nestlings decreasing in size could bring us closer to finding out why populations have been declining. Further research will need to be conducted to determine the reason for this change in size.
Download or read book The American Kestrel written by Roland H. Wauer and published by Big Earth Publishing. This book was released on 2005 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: Using scientific research and easily understood interpretations, Roland H. Wauer covers many topics, such as the falcon's keen eye sight; its amazing migration patterns; its eating habits; and its hunting styles. At the heart of the book is a complete natural history including courtship routines. Foreword by William S. Clark.
Download or read book Metal Exposure and Effects in American Kestrel F a l c o S p a r v e r i u s Nestlings Raised on a Smelter impacted Superfund Site written by Tobias John McBride and published by . This book was released on 2002 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nestling American kestrels (Falco sparverius) inhabiting nest boxes placed throughout the Anaconda Smelter Superfund Site, Montana, were monitored for reproductive success and growth over two successive breeding seasons. A gradient of decreasing soil contaminant concentrations occurred with increasing distance away from the smelter stack. The contaminants of concern (COCs; arsenic, cadmium, lead, copper, and zinc) were determined in food items, pellets, fecal/urate, blood, kidney and liver tissues. Hepatic and renal porphyrin profiles were characterized, and erythrocyte ALAD inhibition assessed, for use as indicators of health effects. Site wide in 1999,43 chicks hatched (81%) with 41 surviving to fledging age (95.3% fledging efficiency). In 2000, 34 chicks hatched (59%) with 32 surviving to fledging age (94% fledging efficiency). Nestling growth and demographics did not appear related to tissue contaminant levels. Active boxes were grouped into two site types (Smelter HiU and Opportunity Ponds) based on their proximity to the smelter site. In 1999, Smelter HiU birds had higher blood lead, liver cadmium, lead, and copper, and kidney cadmium. In 2000, only blood samples were collected, with notably increased lead and cadmium from Smelter Hill birds. Inhibition of erythrocyte ALAD activity at the highest blood lead concentrations indicated lead concentrations reached a threshold level sufficient to initiate biochemical effects. An increase in liver 4-carboxyl porphyrin at the highest liver lead levels likewise suggested sufficient exposure to initiate disruption of heme synthesis. Food items were collected from each active nest. COC concentrations were higher in samples from Smelter Hill boxes, with notable increases seen in arsenic and lead. Contaminant levels in food items were sufficiently high for accumulation in nestling tissues, with elevated levels occurring in nestlings closer in proximity to the smelter.
Download or read book Apparent Absence of Corticosterone Hormonal Stress Response in American Kestrel Falco Sparvenius Nestlings in Response to Adult Alarm Calls written by Meredeth Britten Crandall and published by . This book was released on 2004 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nest Box Use Reproductive Success and Nestling Growth of American Kestrels Falco Sparverius Nesting Along the Coastal Plain of Georgia written by Walter Roy Shuford and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lives of North American Birds written by Kenn Kaufman and published by Houghton Mifflin Harcourt. This book was released on 1996 with total page 708 pages. Available in PDF, EPUB and Kindle. Book excerpt: The bestselling natural history of birds, lavishly illustrated with 600 colorphotos, is now available for the first time in flexi binding.
Download or read book Factors Affecting Biparental Care in the American Kestrel Falco Sparverius written by Stacy Ann Lindemann and published by . This book was released on 1998 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Establishing a Nest Box Program for American Kestrels Along an Interstate Highway written by and published by . This book was released on 1992 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Yolk Androgens and Development in American Kestrel Nestlings written by Melanie Dawn Berg and published by . This book was released on 2009 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book American Kestrel Falco Sparverius Breeding Productivity and Diet in a Vernal Pools and Grassland Habitat written by and published by . This book was released on 2016 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: American Kestrel populations have declined since the 1960s, and the cause has yet to be identified. To further comprehend the decline of the American Kestrel, my study examined kestrel breeding productivity including occupancy, hatching success, and fledging success in nest boxes in conjunction with the identification of dietary resources. In this thesis, I monitored and documented the breeding success of the American Kestrel from nest boxes on the UC Merced's Vernal Pools and Grassland Reserve from 2014-2016. I also analyzed food resources of the population and of individuals to quantify intraspecific and temporal dietary variation. I employed a multi-faceted approach to fully examine diet composition, breadth, and variation within a population. I used pellet and prey remain analysis as well as stable isotope analysis of carbon, nitrogen, and hydrogen in feathers and prey items. Nest box occupancy increased over the three-year study period from 60% to 80%. In 2016, the hatching and fledging success decreased drastically from 68% to 44% and 100% to 69%, respectively. Predation and nest failures occurred more frequently in 2016 compared to 2015 and 2014. Based on examination of prey and pellet remains diet composition was similar in 2015 and 2016, kestrels consumed mostly spiders, orthopterans, and small birds. In 2016, late nesting kestrels (May and June) consumed a greater number of orthopterans compared to kestrels that nested earlier in the season who ate spiders. Stable isotope analyses revealed that adults may feed at a higher trophic level than nestlings. Stable isotope mixing models indicated that adult diets in 2015 and 2016 were composed principally of orthopterans (2015 = 25-59%, 2016 = 18-60%) and birds (2015 = 28-58%, 2016 = 15-60%). In 2015, nestling diets were similar to adult diet with slightly different proportions of orthopterans (18-72%) and birds (17-47%). In 2016 nestlings, diets were comprised of orthopterans (15-58%) and mammals (9-56%). Overall, American Kestrels colonized the nest boxes rapidly, however, reducing predation of eggs and nestlings by mitigating predator access to nest boxes is crucial to increasing hatching and fledging success on the Merced Vernal Pools and Grassland Reserve. In terms of dietary resources, invertebrates are the largest proportion of the kestrel diet. Vertebrate consumption could also be an important factor in kestrel diet due to the higher amount of biomass in vertebrate prey. Preservation of key prey items is crucial to the conservation of the American Kestrel population. Changes in dietary resource abundance could be a predominant factor influencing the decline of the species.
Download or read book Blood Analysis of American Kestrel and Golden Eagle Nestlings Exposed to Malathion Or Carbaryl written by Tomoko Taira and published by . This book was released on 1994 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Kestrel in the Town written by Mike Birkhead and published by Pavilion Children's Books. This book was released on 1988 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Text and photographs depict kestrels feeding, breeding, and defending themselves in their natural habitats.
Download or read book Hawk Ridge written by Laura Erickson and published by U of Minnesota Press. This book was released on 2012 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: Was Caesar like the eagle because of his aquiline (from aquila, for “eagle” in Latin) nose, or does the eagle seem imperial because of his Caesar-like beak? Does the sharp vision of a “hawk-eyed” observer have any basis in nature? And what the heck is “kettling” to a bird-watcher, or, for that matter, a bird? Raptors have captured the imagination from time immemorial and have an especially rich history in Minnesota. The ancient peoples whose pictographs adorn the rock faces of Lake Superior's North Shore may well have witnessed the first hawk movements along Lake Superior—the same annual migration that today draws as many as twenty thousand people to Duluth's Hawk Ridge. These birds, passing through in astounding numbers, are among the hawks and accipiters, buteos and harriers, eagles and ospreys pictured and profiled in detail in this book. Written by one of Minnesota's best-known bird authorities, with images by one of the state's favorite illustrators, Hawk Ridge is as fun as it is informative. It introduces the state's raptors, from the rare visitor to the most familiar hawk, noting each species' signature traits—osprey wings, for instance, are crooked to help them catch fish; vultures urinate on their legs to cool themselves—and their nesting, breeding, and migrating habits. Did you know that Sharp-shinned Hawks banded at Hawk Ridge have been found throughout Central America and even into South America, and also, in midwinter, in Wisconsin? Laura Erickson offers a broad perspective (a bird's-eye view!), making sense of the raptor's role in the larger ornithological scheme. With descriptions of various species—and helpful distinctions between species, families, and orders—the book gives readers a clear idea of which raptors might be seen in Minnesota, when, where, and how often. It also includes a hawk migration primer that explains the movements that bring these birds in such awe-inspiring numbers to places like Hawk Ridge. Filled with curious facts and practical information for expert and amateur bird-watcher alike, the book is at once a guide to the hawks of Minnesota and a beautifully illustrated album of the most regal members of the avian kingdom.
Download or read book Urban Raptors written by Clint W. Boal and published by Island Press. This book was released on 2018-06-12 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: Raptors are an unusual success story of wildness thriving in the heart of our cities—they have developed substantial populations around the world in recent decades. But there are deeper issues around how these birds make their urban homes. New research provides insight into the role of raptors as vital members of the urban ecosystem and future opportunities for protection, management, and environmental education. A cutting-edge synthesis of over two decades of scientific research, Urban Raptors is the first book to offer a complete overview of urban ecosystems in the context of bird-of-prey ecology and conservation. This comprehensive volume examines urban environments, explains why some species adapt to urban areas but others do not, and introduces modern research tools to help in the study of urban raptors. It also delves into climate change adaptation, human-wildlife conflict, and the unique risks birds of prey face in urban areas before concluding with real-world wildlife management case studies and suggestions for future research and conservation efforts. Boal and Dykstra have compiled the go-to single source of information on urban birds of prey. Among researchers, urban green space planners, wildlife management agencies, birders, and informed citizens alike, Urban Raptors will foster a greater understanding of birds of prey and an increased willingness to accommodate them as important members, not intruders, of our cities.
Download or read book The Kestrel written by David Costantini and published by Cambridge University Press. This book was released on 2020-08-27 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt: Widespread across open lands and cities of Europe, Africa, and Asia, the common kestrel (Falco tinnunculus) is one of the most abundant and studied birds of prey. This book brings together and synthesises the results of research on kestrels for professional ornithologists and scientists that seek to consolidate a vast body of literature. It is also a reference for those readers who may not have the depth of scientific knowledge to navigate new fields of scientific enquiry. It examines many aspects of the species' biology, from the reproductive strategies to the behavioural and demographic adaptations to changes of environmental conditions. It also discusses the roles of physiology and immunology in mediating the adaptability of kestrels to the ongoing environmental changes with a particular focus on contaminants. This volume presents new and exciting avenues of research on the ecology and behaviour of the common kestrel.
