Download or read book Relative Proportion of Prey Species in the Diet of Spotted Owls Strix Occidentalis Occidentalis in the San Gabriel Mountains of Southern California written by Cynthia Dawn Hedlund and published by . This book was released on 1996 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dietary Overlap Between Sympatric Mexican Spotted and Great Horned Owls in Arizona written by Joseph L. Ganey and published by . This book was released on 2005 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: We estimated diet composition of sympatric Mexican spotted (Strix occidentalis lucida, n = 7 pairs of owls) and great horned owls (Bubo virginianus, n = 4 pairs) in ponderosa pine (Pinus ponderosa) - Gambel oak (Quercus gambelii) forest, northern Arizona. Both species preyed on mammals, birds, and insects; great horned owls also ate lizards. Mammals dominated the diet of both species. Mammals comprised 63 and 62% of all prey items identified in diets of spotted and great horned owls, respectively, and 94 and 95% of prey biomass. Both species primarily preyed on a few groups of small mammals. Observed overlap in diet composition between species (0.95) was greater than expected based on null models of diet overlap, and the size range of prey taken overlapped entirely. Mean prey mass was similar for both species (great horned owl, 47.0 ± 7.4 g [SE], n = 94 items; spotted owl, 40.1 ± 1.8 g, n = 1,125 items). Great horned owls consumed larger proportions of diurnally active prey than spotted owls, which primarily consumed nocturnally active mammals. Our results, coupled with a previous analysis showing that these owls foraged in the same general areas (Ganey and others 1997), suggests that they could compete for food resources, which are assumed to be limiting in at least some years. They may minimize the potential for resource competition, however, by concentrating foraging activities in different habitats (Ganey and others 1997) and by foraging at different times, when different suites of prey species are active.
Download or read book Diet and Behavior of the California Spotted Owl Strix Occidentalis Occidentalis in the Southern Sierra Nevada written by Joyce Lisa Kadoch and published by . This book was released on 1997 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spotted Owl Strix Occidentalis written by Mark Zarn and published by . This book was released on 1974 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The California Spotted Owl written by and published by . This book was released on 1992 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Population Dynamics of Spotted Owls in the Sierra Nevada California written by and published by . This book was released on 2010 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Population Dynamics of the California Spotted Owl Strix Occidentalis Occidentalis written by Alan B. Franklin and published by . This book was released on 2004-01-01 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: Study analyzed adult survival, fecundity, and rates of population change.
Download or read book Geographic Distributions of Prey of the Northern Spotted Owl in the Central Western Cascades Oregon 1988 2009 written by Alexis Smoluk and published by . This book was released on 2011 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spatial variation in the diet of the northern spotted owl (Strix occidentalis caurina) influences owl home ranges, and understanding this relationship will aid managers in forest management prescriptions that influence spotted owl recovery. This study describes the spatial variation in owl diet based on 4183 prey collected at 114 owl territories in 1833 km2 area of the Central West Cascades during 1988-2009. The study addressed two questions: (1) What are the spatial patterns of owl territories and prey in owl pellets? (2) What landscape characteristics explain the composition of spotted owl prey? Thirteen prey species/groups were identified as key prey to spotted owl diets because they appeared in 10% of owl territories, comprised 90% of the total abundance and 95% of the total biomass across all pellet samples. Northern flying squirrels (Glaucomys sabrinus) were the most important prey in all areas, comprising 46-64% of prey abundance and 48-75% of prey biomass. The spatial distribution of key prey species, especially red tree voles (Arborimus longicaudus), pocket gophers (Thomomys mazama), and rabbits/hares (Sylvilagus bachmani /Lepus americanus) was significantly related to easting, elevation, and fine-scale relief. Red tree voles were more abundant in owl diets at low elevation, with high fine-scale relief and in the western portions of the study area, whereas pocket gophers and rabbits/hares were more abundant in owl diets at high elevation, with low fine-scale relief and in the eastern portions of the study area. Owl territories exhibited a significantly dispersed spatial pattern in almost all years, but the mean nearest neighbor distance between owl territories was 2090m in the western and 3000m in the eastern portions of the study area. Differences in owl pair densities and nearest neighbor distances were related to spatial patterns in owl diet. Where red tree voles comprised a higher proportion of the diet, owl pair density was higher and owl territories were more closely packed than where pocket gophers predominated. These findings suggest that (1) differences in diet among local areas was due to differences in key prey availability, which in turn are influenced by vegetation zone and topography, (2) at high elevation spotted owl sites with abundant pocket gophers and few woodrats in the diet, owl dietary dependence on flying squirrels over the winter and early in the nesting period may require owls to occupy larger territories than owls require in lower elevations, and (3) the spatial variation in owl diets and associated variation in owl pair densities and nearest neighbor distances suggest that owl habitat requirements vary within the West Cascades physiographic province, raising questions about the use of one-size-fits-all habitat values as a management strategy. These findings may be relevant for regulatory agencies and forest managers as they work to recover the spotted owl.
Download or read book Merriam s Shrew Sorex Merriami in the Diet of a Mexican Spotted Owl Strix Occidentalis Lucida from Grant County New Mexico written by Simon P. Tye and published by . This book was released on 2016 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Eastern Screech Owl written by Frederick R. Gehlbach and published by Texas A&M University Press. This book was released on 2008 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: The eastern screech owl, widespread over the eastern half of North America and noticeably tolerant of human activity, is one of America's most familiar birds. Residing naturally in wooded environs with tree cavities, this owl lives well in suburbia and can be found nesting in mailboxes, porch columns, and purple martin houses. Based on a twenty-five-year study, biologist Frederick R. Gehlbach tells the life story of the eastern screech owl, focusing on case studies of suburban and rural study plots in Central Texas. This is the first thorough study of major life-history, behavioral, and ecological features of the species. Indeed, it is the first concurrent, comparative study of an urban and a rural population of any New World animal. Told in a personal voice, the story of these birds will interest all who have not lost touch with their ancestral world. However, Gehlbach has also included quantitative data and analysis of interest to ecologists, wildlife biologists, and ornithologists. Photographs (including color shots of the gray and rufous phases), figures, and tables provide further detail. Gehlbach's investigations have been those of not only an academic ecologist, but a suburbanite curious about his natural surroundings. The result is a model of research on species population dynamics and adaptation, yielding an emerging picture of what the eastern screech owl needs for successful coexistence with human neighbors.
Download or read book Amphibians of Western North America written by Robert C. Stebbins and published by Univ of California Press. This book was released on 2023-12-22 with total page 633 pages. Available in PDF, EPUB and Kindle. Book excerpt: This title is part of UC Press's Voices Revived program, which commemorates University of California Press’s mission to seek out and cultivate the brightest minds and give them voice, reach, and impact. Drawing on a backlist dating to 1893, Voices Revived makes high-quality, peer-reviewed scholarship accessible once again using print-on-demand technology. This title was originally published in 1951. This title is part of UC Press's Voices Revived program, which commemorates University of California Press’s mission to seek out and cultivate the brightest minds and give them voice, reach, and impact. Drawing on a backlist dating to 1893, Voices Revived
Download or read book Fire Effects Guide written by and published by . This book was released on 1994 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Synopsis of the Amphibia of California written by Tracy Irwin Storer and published by . This book was released on 1925 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Problem Solving in Conservation Biology and Wildlife Management written by James P. Gibbs and published by John Wiley & Sons. This book was released on 2011-08-31 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: This set of exercises has been created expressly for students and teachers of conservation biology and wildlife management who want to have an impact beyond the classroom. The book presents a set of 32 exercises that are primarily new and greatly revised versions from the book's successful first edition. These exercises span a wide range of conservation issues: genetic analysis, population biology and management, taxonomy, ecosystem management, land use planning, the public policy process and more. All exercises discuss how to take what has been learned and apply it to practical, real-world issues. Accompanied by a detailed instructor’s manual and a student website with software and support materials, the book is ideal for use in the field, lab, or classroom. Also available: Fundamentals of Conservation Biology, 3rd edition (2007) by Malcolm L Hunter Jr and James Gibbs, ISBN 9781405135450 Saving the Earth as a Career: Advice on Becoming a Conservation Professional (2007) by Malcolm L Hunter Jr, David B Lindenmayer and Aram JK Calhoun, ISBN 9781405167611
Download or read book Conservation Biology written by Scott P. Carroll and published by Oxford University Press. This book was released on 2008-09-15 with total page 393 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main goal of this book is to encourage and formalize the infusion of evolutionary thinking into mainstream conservation biology. It reviews the evolutionary foundations of conservation issues, and unifies conceptual and empirical advances in evolutionary conservation biology. The book can be used either as a primary textbook or as a supplementary reading in an advanced undergraduate or graduate level course - likely to be called Conservation Biology or in some cases Evolutionary Ecology. The focus of chapters is on current concepts in evolution as they pertain to conservation, and the empirical study of these concepts. The balanced treatment avoids exhaustive reviews and overlapping duplication among the chapters. Little background in genetics is assumed of the reader.
Download or read book The Ornithologist and O logist written by and published by . This book was released on 1890 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Learning Landscape Ecology written by Sarah E. Gergel and published by Springer Science & Business Media. This book was released on 2006-04-18 with total page 323 pages. Available in PDF, EPUB and Kindle. Book excerpt: Filled with numerous exercises this practical guide provides a real hands-on approach to learning the essential concepts and techniques of landscape ecology. The knowledge gained enables students to usefully address landscape- level ecological and management issues. A variety of approaches are presented, including: group discussion, thought problems, written exercises, and modelling. Each exercise is categorised as to whether it is for individual, small group, or whole class study.
