Download or read book Topics in Forest Pathology and Ecology in the Sierra Nevada and the Sierra San Pedro Martir Baja written by Patricia Ellen Maloney and published by . This book was released on 2000 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Logging and fire exclusion policies in the Lake Tahoe Basin have increased tree densities over the past 150 years. Current tree densities range up to 450 trees/ha. Cumulative tree mortality in logged (mean = 25%) and unlogged (mean = 21%) stand types were significantly and positively correlated with tree density. The synergistic effect of bark beetles, pathogens, and stand density linked with drought events largely explain mortality in these forests. Unlogged, mixed-conifer forests with the historical fire regime still intact were studied in the Sierra San Pedro Martir, Baja, Mexico. Average tree density was low at 160 trees/ha. Cumulative mortality was 12.7%, with the greatest amount of mortality occurring to larger trees. Most tree mortality (78%) was due to pathogens and bark beetles. Mistletoe and a bark beetle species were widespread on Abies concolor. Mistletoe severity was negatively correlated to A. concolor regeneration. White pine blister rust (WPBR) is a heteroecious rust fungus that alternates between 5-needle pines, and Ribes to complete its life-cycle. In mixed-conifer forests, WPBR prevalence on Pinus lambertiana was correlated with the nearness of Ribes and influenced by environmental conditions favorable for rust infection. Disease was spatially aggregated with new infections occurring annually. In subalpine forests, disease was not correlated with the presence of Ribes. In this exposed location, disease may be episodic rather than chronic. When conditions are favorable, wind allows for widespread dispersal of spores. Demographic effects of this disease on its pine hosts include juvenile mortality and reduced cone production. In two locations in the Sierra Nevada, we found the prevalence and severity of dwarf mistletoe (DWM) on A. concolor was not or weakly correlated to host density, but severity was positively correlated to host size. On Pinus jeffreyi, DWM prevalence and severity were positively correlated with host density. Individuals of all sizes were susceptible to DWM, with less than expected becoming infected in the seedling-10 cm diameter class. Both aggregated and random spatial patterns were found for DWM, suggesting that the degree of infection and logging history are important in the spatial dynamics of DWM species."--Abstract
Download or read book Role of Urban Forests in Plant Conservation in the Lake Tahoe Basin written by Kirsten Elizabeth Heckmann and published by . This book was released on 2005 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2001 with total page 818 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Canadian Journal of Forest Research written by and published by . This book was released on 2008 with total page 876 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book American Doctoral Dissertations written by and published by . This book was released on 2000 with total page 816 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Conifers of California written by Ronald M. Lanner and published by . This book was released on 1999 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Manual of California Vegetation written by John Orvel Sawyer and published by California Native Plant Society. This book was released on 2009 with total page 1316 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Status of the Sierra Nevada written by Sierra Nevada Ecosystem Project and published by . This book was released on 1996 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The California Condor written by Carl B. Koford and published by . This book was released on 1966 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ecophysiology of Economic Plants in Arid and Semi Arid Lands written by Gerald E. Wickens and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with arid and semi-arid environments and their classification, and the physiological restraints and adaptations of plants to the environment. Further, it discusses economic botany and the needs and methods of conserving economic plants. A broad view is taken regarding the definition of economic plants, taking into account their value to the environment as well as to man and to livestock. The individual deserts and associated semi-arid regions are described in separate chapters, providing background information on the regional environments in terms of climate and major plant formations. The economic plants within these formations, their usages, geographical distribution together with their morphological and physiological adaptations are treated in detail.
Download or read book Abbey s Road written by Edward Abbey and published by Penguin. This book was released on 1991-01-30 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt: “The natural world, as we call it, has already become remote, out of reach, mysterious, in the minds of urban and suburban Americans. They see the wilderness disappearing, slipping away, receding into an inaccessible past. But they are mistaken. That world can still be rescued… that is my main excuse for this book.”—Edward Abbey You are about to visit some of the most exciting places on earth. Not the sort of excitement that makes morning headlines or the nightly news. Instead it is the excitement that comes from experiencing the natural world as it always has been and should be, and seeing human beings living in tune with its subtlest rhythms. In Australian cattle country and in the primitive outback. On a desert island off Mexico and in the Sierra Madres. On the Rio Grande and in the great Southwest. On Lake Powell in Utah and in the living American desert. It is adventure. It is enlightenment. It is vintage Abbey. “I have been along a few of Mr. Abbey’s roads. He sees much more than I did. Indeed, reading him is often better than being there was.”—John Leonard, author of Reading for My Life
Download or read book The California Condor 1966 76 A Look at Its Past and Future U S Fish and Wildlife Service written by Sanford R. Wilbur and published by Legare Street Press. This book was released on 2022-10-27 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Download or read book Mountain Kings written by Brian Hubbs and published by . This book was released on 2004 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Red List of US Oaks written by Diana Jerome and published by . This book was released on 2017-08 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Red List of US Oaks is a summary of the IUCN Red List of Threatened Species assessments for all 91 species of Quercus in the United States.
Download or read book Health and Welfare of Captive Reptiles written by Clifford Warwick and published by Springer Nature. This book was released on 2023-01-24 with total page 637 pages. Available in PDF, EPUB and Kindle. Book excerpt: This extensively revised and expanded new edition offers concepts, principles and applied information that relates to the wellbeing of reptiles. As a manual on health and welfare in a similar vein to volumes addressing the sciences of anatomy, behaviour or psychology, this book thoroughly examines the biology of reptile welfare and is about meeting biological needs. The editors, acknowledged experts in their own right, have once again drawn together an extremely impressive international group of contributors. Positive and negative implications of general husbandry and research programs are discussed. In addition to greatly revised original content are nine new chapters offering readers novel insight into: • sensory systems • social behaviour • brain and cognition • controlled deprivation and enrichment • effects of captivity-imposed noise and light disturbance on welfare • spatial and thermal factors• evidential thresholds for species suitability in captivity • record keeping as an aid to captive care • arbitrary husbandry practices and misconceptions The authors have adopted a user-friendly writing style to accommodate a broad readership. Although primarily aimed at academic professionals, this comprehensive volume is fundamentally a biology book that will also inform all involved in captive reptile husbandry. Among others, zoo personnel, herpetologists, veterinarians, lab animal scientists, and expert readers in animal welfare and behavioural studies will benefit from this updated work.
Download or read book Managing Sierra Nevada Forests written by Malcolm North and published by Createspace Independent Publishing Platform. This book was released on 2013-01-20 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: There has been widespread interest in applying new forest practices based on concepts presented in U.S. Forest Service General Technical Report PSW-GTR-220, "An Ecosystem Management Strategy for Sierran Mixed-Conifer Forests." This collection of papers (PSW-GTR-237) summarizes the state of the science in some topics relevant to this forest management approach, presents case studies of collaborative planning efforts and field implementation of these new practices, and clarifies some of the concepts presented in GTR 220. It also describes a method for assessing forest heterogeneity at the stand level using the Forest Vegetation Simulator and a new geographic information system tool for project-level planning that classifies a landscape into different topographic categories. While this collection of papers presents information and applications relevant to implementation, it does not offer standards and prescriptions. Forest management should be flexible to adapt to local forest conditions and stakeholder interests. This report does, however, strive to clarify concepts and present examples that may improve communication with stakeholders and help build common ground for collaborative forest management.
Download or read book Fire Ecology and Management Past Present and Future of US Forested Ecosystems written by Cathryn H. Greenberg and published by Springer Nature. This book was released on 2021-10-01 with total page 513 pages. Available in PDF, EPUB and Kindle. Book excerpt: This edited volume presents original scientific research and knowledge synthesis covering the past, present, and potential future fire ecology of major US forest types, with implications for forest management in a changing climate. The editors and authors highlight broad patterns among ecoregions and forest types, as well as detailed information for individual ecoregions, for fire frequencies and severities, fire effects on tree mortality and regeneration, and levels of fire-dependency by plant and animal communities. The foreword addresses emerging ecological and fire management challenges for forests, in relation to sustainable development goals as highlighted in recent government reports. An introductory chapter highlights patterns of variation in frequencies, severities, scales, and spatial patterns of fire across ecoregions and among forested ecosystems across the US in relation to climate, fuels, topography and soils, ignition sources (lightning or anthropogenic), and vegetation. Separate chapters by respected experts delve into the fire ecology of major forest types within US ecoregions, with a focus on the level of plant and animal fire-dependency, and the role of fire in maintaining forest composition and structure. The regional chapters also include discussion of historic natural (lightning-ignited) and anthropogenic (Native American; settlers) fire regimes, current fire regimes as influenced by recent decades of fire suppression and land use history, and fire management in relation to ecosystem integrity and restoration, wildfire threat, and climate change. The summary chapter combines the major points of each chapter, in a synthesis of US-wide fire ecology and forest management into the future. This book provides current, organized, readily accessible information for the conservation community, land managers, scientists, students and educators, and others interested in how fire behavior and effects on structure and composition differ among ecoregions and forest types, and what that means for forest management today and in the future.
