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Author: Lisa Anne Henderson Publisher: ISBN: Category : Burrowing owl Languages : en Pages : 70
Book Description
Western burrowing owls are found in ground squirrel burrows throughout the urbanized landscape of the South San Francisco bay area, where they are threatened by habitat loss and degradation, prey limitation and predation. Previous research has characterized effects of habitat loss and prey-base limitations on owls, but the interplay between ground squirrels, owls and their predators has not yet been studied. The objective of this study was to assess the rate and types of predation interactions faced by Western burrowing owls and the extent to which California ground squirrels help burrowing owls reduce risk through alarm calling at Moffett Federal Airfield in northern Santa Clara County, California. From June through August 2012 and April through June 2013, over 100 hours of direct observations and 14,540 hours of camera trapping observations yielded seven owl takes by species including red-tailed hawk, red fox, striped skunk, common raven, and snake species. Although the ratio of squirrels to owls was 74:26, ground squirrels were observed responding to predator approaches before owls 58.8% of the time, while burrowing owls responded first 28.4% of the time. Burrowing owls reacted to 65.5% of squirrel alarm calls, while squirrels responded to only 25.8% of owl alarms. This research suggests healthy ground squirrel populations may provide important predator-avoidance services in burrowing owl habitat, and that predation should be of greater concern to burrowing owl conservation. And ground squirrels are needed to determine the extent of predation protection via alarm calls.
Author: Lisa Anne Henderson Publisher: ISBN: Category : Burrowing owl Languages : en Pages : 70
Book Description
Western burrowing owls are found in ground squirrel burrows throughout the urbanized landscape of the South San Francisco bay area, where they are threatened by habitat loss and degradation, prey limitation and predation. Previous research has characterized effects of habitat loss and prey-base limitations on owls, but the interplay between ground squirrels, owls and their predators has not yet been studied. The objective of this study was to assess the rate and types of predation interactions faced by Western burrowing owls and the extent to which California ground squirrels help burrowing owls reduce risk through alarm calling at Moffett Federal Airfield in northern Santa Clara County, California. From June through August 2012 and April through June 2013, over 100 hours of direct observations and 14,540 hours of camera trapping observations yielded seven owl takes by species including red-tailed hawk, red fox, striped skunk, common raven, and snake species. Although the ratio of squirrels to owls was 74:26, ground squirrels were observed responding to predator approaches before owls 58.8% of the time, while burrowing owls responded first 28.4% of the time. Burrowing owls reacted to 65.5% of squirrel alarm calls, while squirrels responded to only 25.8% of owl alarms. This research suggests healthy ground squirrel populations may provide important predator-avoidance services in burrowing owl habitat, and that predation should be of greater concern to burrowing owl conservation. And ground squirrels are needed to determine the extent of predation protection via alarm calls.
Author: Clint W. Boal Publisher: Island Press ISBN: 9781610918404 Category : Nature Languages : en Pages : 336
Book Description
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.
Author: David M. Bird Publisher: Elsevier ISBN: 0080547540 Category : Science Languages : en Pages : 417
Book Description
This book is a collection of papers highlighting ways in which Raptors have successfully adapted to man-made landscapes and structures. The coverage of Raptors in Human Landscapes is broad, ranging from the impact of human activity on country-wide scales to the particular conditions associated with urban, cultivated, and industrial landscapes, as well as to the various schemes specifically directed towards the provision of artificial nest sites and platforms. The cases described hail from a wide geographic range including North and South America, Europe, Africa and elsewhere, and from a broad spectrum of species groups such as the falcons, accipiters, eagles, kites, and many others.This is a book of immense value not only to ornithologists and conservation biologists, but also to engineers and managers involved in all kinds of building and environmental work in cities, power and water works, agriculture, and forestry. - Serves as a good introduction to all aspects of the subject - Focuses on successful adaptations of Raptors to environmental change
Author: Hans J. Peeters Publisher: Univ of California Press ISBN: 0520941160 Category : Science Languages : en Pages : 392
Book Description
Most owls are almost perfectly adapted to life in the dark. Their vaguely humanoid faces reflect the spectacular evolution of their hearing and vision, which has made flight, romance, and predation possible in the near absence of light. This accessible guide, full of intriguing anecdotes, covers all 19 species of owls occurring in North America. More than an identification guide, Field Guide to Owls of California and the West describes the biology and behavior of owls to make finding and identifying them easier and watching them more enjoyable. The guide also explores the conservation challenges that owls face and tells how owls provide insights to scientists working in fields from technology to health. * Color plates illustrate each species * Range maps show the western distribution of North America's owls, 14 of which occur in California * Offers tips for finding and watching owls * Gives information on how to design, place, and maintain nest boxes * Describes human attitudes toward owls through history, including in Native American cultures of the West
Author: Kenn Kaufman Publisher: Houghton Mifflin Harcourt ISBN: 9780618159888 Category : Nature Languages : en Pages : 708
Book Description
The bestselling natural history of birds, lavishly illustrated with 600 colorphotos, is now available for the first time in flexi binding.
Author: Lisa Anne Henderson
Author: Lisa Anne Henderson
Author: Clint W. Boal
Author: David M. Bird
Author: 
Author: Geoffrey L. Holroyd
Author: Hans J. Peeters
Author: Mike Unwin
Author: Kenn Kaufman
Author: 
Author: Karl E. Karalus