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Holocene Vegetation Fire Climate Linkages In Northern Yellowstone National Park Usa
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Book Synopsis Holocene Vegetation-fire-climate Linkages in Northern Yellowstone National Park, USA by : Mariana A. Huerta
Download or read book Holocene Vegetation-fire-climate Linkages in Northern Yellowstone National Park, USA written by Mariana A. Huerta and published by . This book was released on 2009 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Yellowstone National Park has been an important location for paleoecologic studies that focus on the use of charcoal data to reconstruct past fire activity and on the role of climate variations in shaping past vegetation and fire regimes. One hypothesis, which has been explored in other parts of the western U.S., is the idea that present-day summer-dry and summer-wet precipitation regimes were intensified during the early Holocene as a result of greater-than-present summer insolation and its effect on atmospheric circulation patterns. In Yellowstone, this hypothesis was previously examined at two sites, one in summer-wet and one in summer-dry precipitation regions. The records showed variation in both fire and vegetation history that supported the hypothesis. We present a fire and vegetation history from Blacktail Pond, located in Pseudotsuga parkland in the transitional region. The Blacktail Pond data indicate the following ecological history: prior to 12,000 cal yr BP, the site supported tundra vegetation and fire episodes were infrequent. Between 12,000 and 11,000 cal yr BP, Picea-Pinus parkland was established and fire activity increased; these changes are consistent with increasing temperature, as a result of rising summer insolation. From 11,000 to 7600 cal yr BP, the presence of a closed forest of Pinus and some Picea is attributed to high levels of winter moisture, but high fire activity indicates that summers were drier than at present. After 7600 cal yr BP, the presence of forest and steppe vegetation in combination with high fire activity suggest that middle-Holocene conditions were warm and dry. The decrease in Picea and Betula in the last 4000 cal yr indicates continued drying in the late Holocene, although fire-episode frequency was relatively high until 2000 cal yr BP. The pollen data at Blacktail Pond and other low-elevation sites in the northern Rocky Mountains suggest a widespread vegetation response in summer-wet regions to effectively wetter conditions in the early Holocene and decreased moisture in the middle and late Holocene. In contrast, the more-variable fire history among the three sites implies either that (1) summer moisture stress and fire conditions are related to year-round moisture balance and not well predicted by the hypothesis, (2) the transitional area between summer-wet and summer-dry precipitation regimes experienced complicated shifts in effective moisture through time, and/or (3) fire-episode data have a limited source area that makes it difficult to separate local influences from regional climate changes in understanding long-term variations in fire-episode frequency.
Book Synopsis Yellowstone in the Afterglow by : Mary Ann Franke
Download or read book Yellowstone in the Afterglow written by Mary Ann Franke and published by . This book was released on 2000 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ecological Dynamics on Yellowstone's Northern Range by : National Research Council
Download or read book Ecological Dynamics on Yellowstone's Northern Range written by National Research Council and published by National Academies Press. This book was released on 2002-02-01 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ecological Dynamics on Yellowstone's Northern Range discusses the complex management challenges in Yellowstone National Park. Controversy over the National Park Service's approach of "natural regulation" has heightened in recent years because of changes in vegetation and other ecosystem components in Yellowstone's northern range. Natural regulation minimizes human impacts, including management intervention by the National Park Service, on the park ecosystem. Many have attributed these changes to increased size of elk and other ungulate herds. This report examines the evidence that increased ungulate populations are responsible for the changes in vegetation and that the changes represent a major and serious change in the Yellowstone ecosystem. According to the authors, any human intervention to protect species such as the aspen and those that depend on them should be prudently localized rather than ecosystem-wide. An ecosystem-wide approach, such as reducing ungulate populations, could be more disruptive. The report concludes that although dramatic ecological change does not appear to be imminent, approaches to dealing with potential human-caused changes in the ecosystem, including those related to climate change, should be considered now. The need for research and public education is also compelling.
Book Synopsis Recent and Holocene Fire, Climate, and Vegetation Linkages in the Northern Rocky Mountains, USA by : Mitchell J. Power
Download or read book Recent and Holocene Fire, Climate, and Vegetation Linkages in the Northern Rocky Mountains, USA written by Mitchell J. Power and published by . This book was released on 2006 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Exploring the Northern Rocky Mountains by : Colin Arthur Shaw
Download or read book Exploring the Northern Rocky Mountains written by Colin Arthur Shaw and published by Geological Society of America. This book was released on 2014-05-01 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The field trips in this guidebook are associated with the GSA Rocky Mountain-Cordilleran Joint Section Meeting, which will take place in Bozeman, Montana, in May 2014"--
Book Synopsis Late-glacial and Holocene Variations in Fire Frequency in the Central Plateau and Yellowstone-Lamar Provinces of Yellowstone National Park by : Sarah Hooper Millspaugh
Download or read book Late-glacial and Holocene Variations in Fire Frequency in the Central Plateau and Yellowstone-Lamar Provinces of Yellowstone National Park written by Sarah Hooper Millspaugh and published by . This book was released on 1997 with total page 524 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis After the Fires by : Linda L. Wallace
Download or read book After the Fires written by Linda L. Wallace and published by Yale University Press. This book was released on 2004-01-01 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: Americans currently choose their president through the electoral college, an extraordinarily complex mechanism that may elect a candidate who does not receive the most votes. In this provocative book, George Edwards III argues that, contrary to what supporters of the electoral college claim, there is no real justification for a system that might violate majority rule. Drawing on systematic data, Edwards finds that the electoral college does not protect the interests of small states or racial minorities, does not provide presidents with effective coalitions for governing, and does little to protect the American polity from the alleged harms of direct election of the president. In fact, the electoral college distorts the presidential campaign so that candidates ignore most small states and some large ones and pay little attention to minorities, and it encourages third parties to run presidential candidates and discourages party competition in many states. Edwards demonstrates effectively that direct election of the president without a runoff maximizes political equality and eliminates the distortions in the political system caused by the electoral college.
Book Synopsis Yellowstone's Wildlife in Transition by : P. J. White
Download or read book Yellowstone's Wildlife in Transition written by P. J. White and published by Harvard University Press. This book was released on 2013-04-01 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt: The world's first national park is constantly changing. How we understand and respond to recent events putting species under stress will determine the future of ecosystems millions of years in the making. Marshaling expertise from over 30 contributors, Yellowstone's Wildlife in Transition examines three primary challenges to the park's ecology.
Book Synopsis Algemeen belang. Democratische Partij by :
Download or read book Algemeen belang. Democratische Partij written by and published by . This book was released on with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Climate and Vegetation Change During the Late-glacial/early-Holocene Transition Inferred from Multiple Proxy Records from Blacktail Pond, Yellowstone National Park, USA by : Teresa R. Krause
Download or read book Climate and Vegetation Change During the Late-glacial/early-Holocene Transition Inferred from Multiple Proxy Records from Blacktail Pond, Yellowstone National Park, USA written by Teresa R. Krause and published by . This book was released on 2013 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of environmental changes from late-glacial ice recession through the early Holocene are revealed in a 7000-yr-long record of pollen, charcoal, geochemistry, and stable isotopes from Blacktail Pond, a closed-basin lake in Yellowstone National Park. Prior to 11,500 cal yr BP, cool conditions dominated, fire activity was low, and alpine tundra and Picea parkland grew on the landscape. A step-like climate change to warm summer conditions occurred at 11,500 cal yr BP. In response, fire activity increased facilitating a transition from Picea parkland to closed Pinus forest. From 11,500 to 8280 cal yr BP, warm summers and abundant moisture mostly likely from high winter snowfall supported closed Pinus contorta forests. Cooler drier summer conditions prevailed beginning 8280 cal yr BP due to decreased summer insolation and winter snowpack, and lower parkland developed. The timing of vegetation change in the Blacktail Pond record is similar to other low- and middle-elevation sites in the northern Rocky Mountains during the late-glacial period, suggesting local plant communities responded to regional-scale climate change; however, the timing of vegetation changes was spatially variable during the early and middle Holocene due to the varying influences of strengthened summer monsoons and subtropical high on regional precipitation patterns.
Book Synopsis Post-fire Vegetation and Climate Dynamics in Low-elevation Forests Over the Last Three Millennia in Yellowstone National Park by : M. Allison Stegner
Download or read book Post-fire Vegetation and Climate Dynamics in Low-elevation Forests Over the Last Three Millennia in Yellowstone National Park written by M. Allison Stegner and published by . This book was released on 2019 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Conifer forests of the western US are historically well adapted to wildfires, but current warming is creating novel disturbance regimes that may fundamentally change future forest dynamics. Stand-replacing fires can catalyze forest reorganization by providing periodic opportunities for establishment of new tree cohorts that set the stage for stand development for centuries to come. Extensive research on modern and past fires in the Northern Rockies reveals how variations in climate and fire have led to large changes in forest distribution and composition. Unclear, however, is the importance of individual fire episodes in catalyzing change. We used high-resolution paleoecologic and paleoclimatic data from Crevice Lake (Yellowstone National Park, Wyoming, USA), to explore the role of fire in driving low-elevation forest dynamics over the last 2820 yr. We addressed two questions: 1) did low-elevation forests at Crevice Lake experience abrupt community-level vegetation changes in response to past fire events? 2) Did the interaction of short-term disturbance events (fire) and long-term climate change catalyze past shifts in forest composition? Over the last 2820 yr, we found no evidence for abrupt community-level vegetation transitions at Crevice Lake, and no evidence that an interaction of climate and fire produced changes in the relative abundance of dominant plant taxa. In part, this result reflects limitations of the datasets to detect past event-specific responses and their causes. Nonetheless, the relative stability of the vegetation to fires over the last 2820 yr provides a local baseline for assessing current and future ecological change. Observations of climate?fire?vegetation dynamics in recent decades suggest that this multi-millennial-scale baseline may soon be exceeded.
Book Synopsis Ecological Impacts of Climate Change by : National Research Council
Download or read book Ecological Impacts of Climate Change written by National Research Council and published by National Academies Press. This book was released on 2008-12-07 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: The world's climate is changing, and it will continue to change throughout the 21st century and beyond. Rising temperatures, new precipitation patterns, and other changes are already affecting many aspects of human society and the natural world. In this book, the National Research Council provides a broad overview of the ecological impacts of climate change, and a series of examples of impacts of different kinds. The book was written as a basis for a forthcoming illustrated booklet, designed to provide the public with accurate scientific information on this important subject.
Book Synopsis The Ecological Implications of Fire in Greater Yellowstone by : Jason M. Greenlee
Download or read book The Ecological Implications of Fire in Greater Yellowstone written by Jason M. Greenlee and published by . This book was released on 1996 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Greater Yellowstone Ecosystem by : Robert B. Keiter
Download or read book The Greater Yellowstone Ecosystem written by Robert B. Keiter and published by Yale University Press. This book was released on 1994-04-05 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 1872, Congress designated Yellowstone National Park as the world's first National Park. In this book, various experts in science, economics and law discuss key resource management issues in the greater Yellowstone ecosystem, and how humans should interact with the environment of this area.
Book Synopsis Fire in Paradise by : Micah Morrison
Download or read book Fire in Paradise written by Micah Morrison and published by . This book was released on 1993 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: Discusses the debate over the controversial political and environmental issues surrounding the 1988 series of fires in Yellowstone National Park.
Book Synopsis Holocene Changes in Fire, Climate and Vegetation in the Northern Rocky Mountains of Idaho and Western Montana by : Andrea Brunelle-Daines
Download or read book Holocene Changes in Fire, Climate and Vegetation in the Northern Rocky Mountains of Idaho and Western Montana written by Andrea Brunelle-Daines and published by . This book was released on 2002 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Holocene Climate-vegetation-fire Linkages Along the Patagonian Forest/steppe Ecotone (41-43°S) by : Virginia Iglesias
Download or read book Holocene Climate-vegetation-fire Linkages Along the Patagonian Forest/steppe Ecotone (41-43°S) written by Virginia Iglesias and published by . This book was released on 2013 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt: Patagonian vegetation has dramatically changed in composition and distribution since the Last Glacial Maximum. Although patterns of vegetation change are relatively clear, our understanding of the processes that produce them is limited. In this study, I reconstructed the vegetation and fire history of the North Patagonian forest-steppe ecotone (lat. 41 - 43°S) and linked vegetation changes to variations in the fire regime, large-scale synoptic controls of climate, and human activity. Postglacial vegetation and fire dynamics were inferred from seven high-resolution pollen and charcoal records from lakes located along the forest-steppe ecotone. Regional trends in vegetation composition and biomass burning were compared to independent records of climate to assess longterm climate-vegetation-fire linkages. Pollen data indicate that late-glacial steppe was replaced by parkland in the early Holocene and by shrubland and forest in the middle and late Holocene. Fire activity was lowest during the late-glacial/early-Holocene transition and gradually increased throughout the Holocene. Based on current knowledge of human settlement in the area, there is no evidence that indicates that increased aboriginal population densities resulted in higher biomass burning at regional scales. Instead, results show that climate was the main driver of Holocene ecological change, either by its direct effects on vegetation or its indirect effects on fire. Watershed vegetation flammability explains much of the fine-scale variability in the fire regime, which, in turn can amplify or override the direct influence of climate on ecotone composition. During the late Holocene, in particular, oscillations in forest dominance were largely driven by changes in humidity, possibly associated with the onset or strengthening of ENSO. At intermediate-moisture levels fire became an important control of community composition. These findings emphasize the importance of biophysical feedbacks in ecosystem dynamics and suggest that these relations must be understood in the context of millennial-scale climate variations that shape broad patterns of vegetation and fire in the region.
