Download or read book Distribution and Abundance of Snags in the Sagehen Creek Basin California written by and published by . This book was released on 1986 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: The distribution of snags by tree species in the eastern Sierra Nevada of California generally reflects the associated timber type. Where present, however, lodgepole pine (Pinus conrorta Dougl.) forms a large proportion of the snags present. Few snags of any species were present in the Jeffrey pine (P. jeffrryi Grev. & Balf. in A. Murr.) timber type in a study at Sagehen Creek Basin, in Nevada County. Simple regression analysis showed weak but significant relationships between snag density and canopy height, canopy cover, and slope. Multiple regression analysis were also weak, but revealed that snag density increased as size of natural openings increased. These results indicate that most snags in the study area were formed by the action of water (i.e., meadows, creeks) and fire. Thus, managers could concentrate snag surveys (and protective measures) near water and natural openings. Management of riparian areas is especially important because such areas are usually readily accessible to the public (e.g., fuelwood cutters). Aerial photography should be useful in locating areas of highest snag density; regression analysis appears to be of marginal usefulness.
Download or read book The Environmental Legacy of the UC Natural Reserve System written by Peggy L. Fiedler and published by Univ of California Press. This book was released on 2013-02-04 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book tells the story of how a few forward-thinking UC faculty, who'd had their research plots and teaching spots destroyed by development and habitat degradation, devised a way to save representative examples of many of California's major ecosystems.
Download or read book Stability and Change in Minerotrophic Peatlands Sierra Nevada of California and Nevada written by James W. Bartolome and published by . This book was released on 1990 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Minerotrophic peatlands or fens in California's Sierra Nevada are small wet meadows surrounded by mixed conifer forest. The dynamics of vegetation change at the meadow edge and the ages and development of fens were investigated, in the Sagehen Creek Basin near Truckee, California, through the use of radiocarbon dating of peat, pollen studies, examination of processes of peat development and accumulation, stand age analysis of trees around peatlands, and evaluation of tree-ring variation. These approaches were used to evaluate both short- and long-term changes. Fens varied in age from more than 8000 years toless than 1000years old. Results suggest that overall fen development proceeds rapidly, with peat buildup dependent upon adequate moisture supply. During fen development trees repeatedly invade and retreat from the fen edges. The timing of invasions appears unrelated to events such as human disturbance and climatic change. Instead, changes are most likely to result from alterations in groundwater supply in interaction with tree establishment, longevity, and water uptake. Little evidence was found that accepted successional models which emphasize predictable and gradual vegetational development apply to fens in the Sagehen Basin.
Download or read book Guide to Biological Field Stations written by Organization of Biological Field Stations and published by . This book was released on 1992 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Seed Dissemination in Small Clearcuttings in North central California written by Philip M. McDonald and published by . This book was released on 1980 with total page 796 pages. Available in PDF, EPUB and Kindle. Book excerpt: In a 1964-1967 study on the Challenge Experimental Forest, seedfall was evaluated in 2-, 5-, and 10-acre circular clearcuttings. During the 4 years, 10 seed crops, ranging from light to bumper, were produced by ponderosa pine. white fir, Douglas-fir, and incense cedar. Seedfall ranged from 76 to 40,691 sound seed per acre (188 to 100,547/ha) for a single species in a given year. From 89 to 100 percent of each species' seed fell within an area 1 1/2 times the height of the average dominant tree. Overall, seed distribution was highly variable.
Download or read book Biodiversity written by National Academy of Sciences/Smithsonian Institution and published by National Academies Press. This book was released on 1988-01-01 with total page 535 pages. Available in PDF, EPUB and Kindle. Book excerpt: This important book for scientists and nonscientists alike calls attention to a most urgent global problem: the rapidly accelerating loss of plant and animal species to increasing human population pressure and the demands of economic development. Based on a major conference sponsored by the National Academy of Sciences and the Smithsonian Institution, Biodiversity creates a systematic framework for analyzing the problem and searching for possible solutions.
Download or read book Evolutionary Differentiation in Morphology Vocalizations and Allozymes Among Nomadic Sibling Species in the North American Red Crossbill Loxia Curvirostra Complex written by Jeffrey G. Groth and published by Univ of California Press. This book was released on 1993-08-16 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt: The highly variable North American red crossbill complex has presented one of the most controversial problems in avian systematics. Although crossbills wander nomadically and breed all year, they have not become homogenized in bill and body size. This study suggests that this crossbill complex contains several distinctive sibling species that breed sympatrically and show ecological differences.
Download or read book Tahoe National Forest N F Land and Resource s Management Plan LRMP written by and published by . This book was released on 1990 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book USDA Forest Service Experimental Forests and Ranges written by Deborah C. Hayes and published by Springer. This book was released on 2014-07-22 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt: USDA Forest Service Experimental Forests and Ranges (EFRs) are scientific treasures, providing secure, protected research sites where complex and diverse ecological processes are studied over the long term. This book offers several examples of the dynamic interactions among questions of public concern or policy, EFR research, and natural resource management practices and policies. Often, trends observed – or expected -- in the early years of a research program are contradicted or confounded as the research record extends over decades. The EFRs are among the few areas in the US where such long-term research has been carried out by teams of scientists. Changes in society’s needs and values can also redirect research programs. Each chapter of this book reflects the interplay between the ecological results that emerge from a long-term research project and the social forces that influence questions asked and resources invested in ecological research. While these stories include summaries and syntheses of traditional research results, they offer a distinctly new perspective, a larger and more complete picture than that provided by a more typical 5-year study. They also provide examples of long-term research on EFRs that have provided answers for questions not even imagined at the time the study was installed.
Download or read book Tahoe National Forest N F and Lake Tahoe Management Unit Eight Eastside Rivers Wild and Scenic River s WSR Study written by and published by . This book was released on 1998 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Forest Service Research and Development written by Peter Stine and published by . This book was released on 2016 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Social Biology of the Bushy tailed Woodrat Neotoma Cinerea written by Peter C. Escherich and published by Univ of California Press. This book was released on 1981 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Women in Field Biology written by Martha L. Crump and published by CRC Press. This book was released on 2022-08-23 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: Women are contributing to disciplines once the sole domain of men. Field biology has been no different. The history of women field biologists, embedded in a history largely made and recorded by men, has never been written. Compilations of biographies have been assembled, but the narrative—their story—has never been told. In part, this is because many expressed their passion for nature as writers, artists, collectors, and educators during eras when women were excluded from the male-centric world of natural history and science. The history of women field biologists is intertwined with men’s changing views of female intellect and with increasing educational opportunities available to women. Given the preponderance of today’s professional female ecologists, animal behaviorists, systematists, conservation biologists, wildlife biologists, restoration ecologists, and natural historians, it is time to tell this story—the challenges and hardships they faced and still face, and the prominent role they have played and increasingly play in understanding our natural world. For a broader perspective, we profile selected European women field biologists, but our primary focus is the journey of women field biologists in North America. Each woman highlighted here followed a unique path. For some, personal wealth facilitated their work; some worked alongside their husbands. Many served as invisible assistants to men, receiving little or no recognition. Others were mavericks who carried out pioneering studies and whose published works are still read and valued today. All served as inspiration and proved to the women who would follow that women are as capable as men at studying nature in nature. Their legacy lives on today. The 75 female field biologists interviewed for this book are further testament that women have the intellect, stamina, and passion for fieldwork.
Download or read book Sport Fishery Abstracts written by and published by . This book was released on 1969 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Shaping Biology written by Toby A. Appel and published by JHU Press. This book was released on 2003-04-30 with total page 409 pages. Available in PDF, EPUB and Kindle. Book excerpt: Historians of the postwar transformation of science have focused largely on the physical sciences, especially the relation of science to the military funding agencies. In Shaping Biology, Toby A. Appel brings attention to the National Science Foundation and federal patronage of the biological sciences. Scientists by training, NSF biologists hoped in the 1950s that the new agency would become the federal government's chief patron for basic research in biology, the only agency to fund the entire range of biology—from molecules to natural history museums—for its own sake. Appel traces how this vision emerged and developed over the next two and a half decades, from the activities of NSF's Division of Biological and Medical Sciences, founded in 1952, through the cold war expansion of the 1950s and 1960s and the constraints of the Vietnam War era, to its reorganization out of existence in 1975. This history of NSF highlights fundamental tensions in science policy that remain relevant today: the pull between basic and applied science; funding individuals versus funding departments or institutions; elitism versus distributive policies of funding; issues of red tape and accountability. In this NSF-funded study, Appel explores how the agency developed, how it worked, and what difference it made in shaping modern biology in the United States. Based on formerly untapped archival sources as well as on interviews of participants, and building upon prior historical literature, Shaping Biology covers new ground and raises significant issues for further research on postwar biology and on federal funding of science in general.
Download or read book The Odyssey of a Woman Field Scientist written by JEAN H. LANGENHEIM and published by Xlibris Corporation. This book was released on 2010-02-22 with total page 541 pages. Available in PDF, EPUB and Kindle. Book excerpt: Here, Jean Langenheim presents her odyssey as a woman field scientist, who crossed boundaries of botany, geology, and chemistry in doing ecological studies. The book includes almost two hundred photographs and maps and uses a unique timeline as context for her story in relation to relevant historical events, significant changes in the status of women, and milestones in ecology from the 1920s to the present. Her research spans five continents and ranges from arctic-alpine to tropical environments. It includes many adventures (such as a forced plane landing in Amazonia and working in the midst of a coup dtat in Colombia) and interactions with diverse cultures, from Alaska Eskimo to Ghanain family life. She tells the story of a rich life of learning and discovery, through difficult and good times, which she has shared with her husband and later with her students, colleagues, and many friends many around the world. INITIAL REVIEW STATEMENTS Anyone who reads this rich and wonderfully interesting memoir will be inspired by what Jean Langenheim has accomplished scientifically and personally during her long and distinguished career at the interface of multiple scientific fields. This is more than a personal memoir by a leading scientist. It is a deeply insightful reflection on how major scientific disciplines have developed over the past half century and how the culture of scientific research itself has changed. John Thompson, Distinguished Professor of Ecology and Evolution, University of California, Santa Cruz (quoted in UCSC press release http://press.ucsc.edu/text.asp?pid=3771 ) The title of this good read is truly apropos---it is an odyssey of the mind as well as life of a self-confessed adventurous woman, someone always open to the next chapter in an ever-changing life, lived during a period of significant social and technological changes. Theres a solid dose of real scientific research and discovery, tempered by the authors vivid descriptions of her travels, of the wonders of the natural world, and of the cultures she encounters in some amazing places she finds herself. Provocatively, you may recognize and view elements of your own life in ways you never thought about before. Susan Martin, retired researcher US Department of Agriculture, Colorado State University. I liked very much your life metaphor about weaving threads in your life tapestry. It was delightful to read how those threads were constructed and woven. Your life has been very rich, impacting and inspiring many people with your thoughts and action. Francisco Espinosa-Garcia, Professor, National University of Mexico Center for Ecosystem Research, Morelia, Mexico.
Download or read book Guide to Biological Field Stations Directory of Members written by Organization of Biological Field Stations and published by . This book was released on 1992 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt:
