Download or read book A Palaeoecological Study of Holocene Environmental Change in a Small Upland Lake from the Kola Peninsula Russia written by Nadezhda Solovieva and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Palaeoecological Study of Holocene Environmental Change in a Small Upland Lake in the Kola Peninsula written by and published by . This book was released on 2000 with total page 826 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Long term Environmental Change in Arctic and Antarctic Lakes written by Reinhard Pienitz and published by Springer Science & Business Media. This book was released on 2007-11-08 with total page 579 pages. Available in PDF, EPUB and Kindle. Book excerpt: Concerns about the effects of global climate change have focused attention on the vulnerability of circumpolar regions. This book offers a synthesis of the spectrum of techniques available for generating long-term environmental records from circumpolar lakes.

Download or read book British National Bibliography for Report Literature written by and published by . This book was released on 2001 with total page 806 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Index to Theses with Abstracts Accepted for Higher Degrees by the Universities of Great Britain and Ireland and the Council for National Academic Awards written by and published by . This book was released on 2001 with total page 770 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mid Holocene Environmental Change written by Peter Andrew Ryan and published by . This book was released on 2006 with total page 273 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Handbook of Holocene Palaeoecology and Palaeohydrology written by B. E. Berglund and published by . This book was released on 1986-03-26 with total page 906 pages. Available in PDF, EPUB and Kindle. Book excerpt: This handbook reviews the key palaeoecological methods applied to primarily organic lake and mire deposits. Particular attention is paid to Holocene environmental changes in the temperate zone, but most methods can be applied to older Quaternary deposits and to areas outside the temperate zone. The need for uniform methods of correlating stratigraphical data on a continental scale is emphasized.

Download or read book Holocene Environmental Change of Southern land Sweden written by Kerstin Alm Kübler and published by . This book was released on 2001 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Early Holocene Local Environments Fire Regimes and Land Use Signals Inferred from Multi proxy Palaeoecological Records at Two Microregions of Southwestern Germany written by Shaddai Damaris Heidgen and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: High-resolution multi-proxy palaeoecological studies are one of the best means for reliably tackling the question of how climate, ecosystem dynamics, and human agency are interrelated in a long-term perspective. When applied in areas with well-studied and precisely dated past settlement and land use history, such multi-proxy analyses offer valuable novel insights on climatic and anthropogenic agency in a given landscape. Disentangling those two main driving factors is key to shaping past vegetation and environments. Moreover, detailed local information on past ecosystems obtained by palaeoecological research is highly relevant to understanding how ancient human populations adapted to the environmental change, how far they exploited natural resources, and how their land-use strategies affected the landscape. The current thesis involves a multi-proxy palaeoecological study of two areas in southwestern Germany, with rich and complex prehistoric occupation and a wide range of archaeological evidence from the Upper Palaeolithic period onwards: The Upper Neckar and Upper Swabia. In the first study area, a palaeo-wetland within the Ammer River Valley in the Upper Neckar was chosen. It corresponds to the overall distribution limit of the Linear Bandkeramik (LBK) with over 200 Neolithic sites, such as Lüsse and Unteres Feld, which were studied archaeologically in detail. Adjacent to the study area (6 km distance) is the well-stratified, open-air Mesolithic site of Rottenburg-Siebenlinden. In the second study area, the Upper Swabian region, the focus was on Olzreuter Lake. It is located in the vicinity of Bad Schussenried, at about 97 km south-east from the Ammer River Valley and ca. 10 km from the archaeologically well-studied UNESCO world heritage sites of Federsee. Archaeological evidence from the lake shores and nearby Olzreuter-Enzisholz pointed to a Late Neolithic and Bronze Age human occupation. Two parallel sediment cores covering the period of the Early Holocene were retrieved from the Ammer River Valley, X039 A (14 m) and X039B (16 m). At the Olzreuter Lake, two parallel sediment cores were retrieved, OZ1 (8 m) and OZ2 (9 m), covering the period from the Late Glacial until the Late Holocene. In these sediment cores, a multi-proxy analysis was applied, aiming to understand the potential effect of climatic variability, changes in the landscape, and land-use strategies. These analyses included pollen and spores, NPPs, charcoal, diatoms, chrysophytes, total organic carbon (TOC), geochemical (micro-XRF), radiocarbon dating and lithological proxies. During the Late Glacial and Early Holocene, besides climate, also fire was the principal driver of environmental changes. However, it is still heavily debated if anthropogenic fire co-shaped the environment already during the Early Holocene or only later on. The results of the current high-resolution multi-proxy study, along with detailed archaeological evidence about settlement dynamics and land use development, allowed us to understand the impact of human agency and climate on vegetation and aquatic ecosystems. In both areas, the Late Glacial/Early Holocene started as a period ruled by open vegetation with a high abundance of Pinus, Betula, Artemisia, and Poaceae. After ameliorating the climate, Corylus started to rise at 10.8 cal ka BP in Ammer River Valley and Olzreuter Lake at 10.65 cal ka BP, indicating the dominance of open woodland in both landscapes. Results of micro- and macrocharcoal records from both Olzreuter Lake and Ammer River Valley show that during the Late Glacial, fire events were determined by climatic variability rather than the effect of human agency, but soon after, at the beginning of the Early Holocene anthropogenic activities can be linked to fire events. Mesolithic people probably applied fire to keep the opening of the landscapes and enhance the spread of advantageous vegetation, e.g., hazelnuts. The palaeofire records from the Early Holocene in the Ammer River Valley indicate wildfires from 11.6-10.6 cal ka BP, which facilitated the persistence of open and pioneer vegetation. Soon after, the domination of a river landscape was replaced by a palaeo-wetland with open shallow waters that were attractive to Mesolithic populations. The Ammer River Valley was then dominated by Corylus (10.1 cal ka BP) but also provided a wide range of other plant resources. From ca. 9.5 cal ka BP, archaeological evidence coincides with the timeframe when frequent, low-intensity fires (e.g., pattern typical for human-induced palaeofire) and vegetation disruption occurred, and therefore, the use of fire by hunter-gatherers shall not be neglected. In this study, soon after the 8.2 rapid climate change event, the rise of the mixed oak forest is noticeable in both regions, with the Corylus pollen decreasing but persisting in the landscapes probably because of the suitable wetland habitats in the surrounding both studied cores. The palaeoecological record at Olzreuter Lake also covers the period after the Early Holocene. The dominance of mixed oak forests ends at circa 6.2 cal ka BP, with the abrupt increase in Fagus. Closed forests arise thanks to the intense domination of Fagus, out-competing the elements of the mixed oak forest by shadowing them. In the Middle Holocene and Late Holocene, settlement activities and fire events show a clear relation. The agricultural practices in the vicinity of Olzreuter Lake during the Late Neolithic and Bronze Age are reflected by vegetation change and specific patterns of the studied charcoal records. Lake productivity had suffered several fluctuations over time, with the appearance and disappearance of diatoms and Chrysophytes. Ecological changes in the lake, small lake level fluctuations, and physicochemical and biological processes can be specially noticed from the Middle Holocene onwards and essentially can be linked with climatic and anthropogenic agency.

Download or read book Tracking Environmental Change Using Lake Sediments written by John P. Smol and published by Springer Science & Business Media. This book was released on 2006-04-11 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: Paleolimnology is a rapidly developing science that is now being used to study a suite of environmental and ecological problems. This volume is the fourth handbook in the Developments in Paleoenvironmental Research book series. The first volume (Last & Smol, 2001a) examined the acquisition and archiving of sediment cores, chronological techniques, and large-scale basin analysis methods. Volume 2 (Last & Smol, 2001b) focused on physical and chemical methods. Volume 3 (Smol et al. , 2001), along with this book, summarize the many biological methods and techniques that are available to study long-term environmental changeusing information preserved in sedimentary profiles. A subsequent volume (Birks et al. , in preparation) will deal with statistical and data handling procedures. It is our intent that these books will provide sufficient detail and breadth to be useful handbooks for both seasoned practitioners as well as newcomers to the area of paleolimnology. These books will also hopefully be useful to non-paleolimnologists (e. g. , limnologists, archeologists, palynologists, geographers, geologists, etc. ) who continue to hear and read about pal- limnology, but have little chance to explore the vast and sometimes difficult to access journal-based reference material for this rapidly expanding field. Although the chapters in these volumes target mainly lacustrine settings, many of the techniques described can also be readily applied to fluvial, glacial, marine, estuarine, and peatland environments. This current volume focuses on zoological indicators preserved in lake sediments, whilst Volume 3 focused on terrestrial, algal, and siliceous indicators.

Download or read book Advances in Holocene Palaeoecology in Bulgaria written by Elissaveta Bozilova and published by Pensoft Publishers. This book was released on 1995 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Paleoecological Research on Easter Island written by Valentí Rull and published by Elsevier. This book was released on 2020-08-07 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: Paleocological Research on Easter Island: Insights on Settlement, Climate Changes, Deforestation and Cultural Shifts examines the area's climatic and ecological history, a topic not usually addressed in other literature. The book provides a thorough and synthetic account of all paleoecological works developed to date, including the latest discoveries. Finally, it attempts to match paleoecological evidence with the results of other disciplines creating a multidisciplinary framework. This approach to the field is ideal for researchers, university professors and graduate students in a varied range of disciplines and subdisciplines, including ecology, paleoecology, paleoclimatology, biogeography, sedimentology, and paleontology. Users will find synthesized information on Easter Island from the last millennia that will help pave the way towards an integrated interdisciplinary vision of the island's environmental-ecological-cultural system as a complex functional unit. Human and environmental deterministic views are avoided and the Easter Island enigmas are analyzed under a holistic perspective of continuous feedbacks and synergies among the different components of the system. - Provides the first synthesis of the available paleoecological knowledge on Easter Island - Furnishes clues on how to integrate paleoecological information with evidence from other disciplines - Addresses the complexity of the environmental-ecological-cultural system by analyzing the interactions (feedbacks and synergies) among its components

Download or read book Palaeoecological Events During the Last 15 000 Years written by B. E. Berglund and published by . This book was released on 1996 with total page 816 pages. Available in PDF, EPUB and Kindle. Book excerpt: Consists of well-documented data on palaeoecological changes since deglaciation related to vegetation, lake development, mire, soil erosion, human impact, etc. The majority of the book is concerned with regional syntheses of palaeoecological changes in 21 European countries presented by 40 authors. Text, tables and figures have been standardized for easy comparison.

Download or read book Holocene Climate and Environmental Change in the Great Basin of the Western United States written by Scott Alan Reinemann and published by . This book was released on 2013 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: In this dissertation, I have completed a research project that focused on reconstructing past climate and environmental conditions in the Great Basin of the western United States. This research project incorporates four discrete but interrelated studies. (1) The geochemistry of lake sediments was used to identify anthropogenic factors influencing aquatic ecosystems of sub-alpine lakes in the western United States during the past century. Sediment cores were recovered from six high elevation lakes in the central Great Basin of the United States. Mercury (Hg) flux varied among lakes but all exhibited increasing fluxes during the mid-20th century and declining fluxes during the late 20th century. Peak Spheroidal Carbonaceous Particles (SCP) flux for all lakes occurred at approximately 1970, after which SCP flux was greatly reduced. Atmospheric deposition is the primary source of Hg and anthropogenically produced SCPs to these pristine high elevation lakes during the late 20th century. (2) Chironomids are used to develop centennial length temperature reconstructions for six sub-alpine and alpine lakes in the central Great Basin of the United States. Chironomid-inferred temperature estimates indicate that four of the six lakes were characterized by above average air temperatures during the post-AD 1980 interval and below average temperatures during the early 20th century. This study adds to the growing body of evidence that sub-alpine and alpine lakes in the western United States have been, and are increasingly being affected by anthropogenic climate change in the early 21st century. (3) A sediment core representing the past two millennia was recovered from Stella Lake in the Snake Range of the central Great Basin in Nevada. The core was analyzed for sub-fossil chironomids and sediment organic content. The chironomid-based mean July air temperature (MJAT) reconstruction suggests that the Medieval Climate Anomaly (MCA), was characterized by MJAT elevated 1.0°C above the subsequent Little Ice Age (LIA), but likely not as warm as recent conditions. The Stella Lake record provides evidence that elevated summer temperature contributed to the increased aridity that characterized the western United States during the MCA. (4) Lake sediment cores spanning roughly the last 7,000 years were recovered from four small sub-alpine and alpine lakes located in central Great Basin of the United States. Reconstructions of MJAT were developed for each of the study sites using a chironomid-based inference model for MJAT (two-component Weighted Averaging-Partial Least Squares (WA-PLS)). The elevated temperature that characterizes the mid-Holocene at Stella Lake is surpassed only during the Medieval Climate Anomaly and in the post-AD 1800 interval. The reconstructions for the sites located in the northern portion of the study transect are characterized by greater variability, likely reflecting the influence of both radiative forcing and catchment-specific conditions.

Download or read book Holocene Environmental Changes Disclosed from Anoxic Fjord Sediments by Biomarkers and Their Radiocarbon Content written by Rienk Hajo Smittenberg and published by . This book was released on 2003 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Palaeoenvironment and Sea Level Changes During the Early Holocene on the S dert rn Peninsula S dermanland Eastern Sweden written by Jan Risberg and published by . This book was released on 1991 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Using Paleoecological Proxies to Determine Holocene Environmental Change written by Rachel Skudder and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A multi-proxy paleoecological and sedimentological record for the last ~8.3kyr is extracted from a 2.1m coastal seacliff at Onaero Beach, North Taranaki. This record is used to infer both local environmental changes including shoreline, coastal conditions, as well as regional changes in atmospheric circulation and climate wetness. Analysis of diatom and pollen populations, particle size, and loss on ignition provide the raw data from which inferences regarding salinity and vegetation are made. Changes are tied to a chronology determined through radiocarbon ages and tephrochronology. Key objectives of this study are: (1) To characterize changes in salinity and relative shoreline position at Onaero Beach (2) To characterise changes in vegetation and relate these changes to overall state of the climate through the Holocene (3) Compare the results of this study with others from New Zealand and the wider south pacific to investigate how the Onaero Beach section fits in both a regional and global context. Diatom analysis of the Onaero section revealed the dominance of brackish to marine species which suddenly at 7.3ka after which time diatom assemblages were dominated by fresh and salt intolerant species. The marine to freshwater transition represents a transition from a brackish to freshwater coastal lagoon. Pollen analysis of the Onaero Beach section indicates the region was dominated by podocarp forest. The increasing dominance of Dacrydium and decline in other podocarps suggests an increase in overall climate wetness. The disappearance of pollen in conjunction with the deposition of tephra at ~4.15ka is not conclusive proof of, but certainly fits with, the idea of a significant climatic event occurring at ~4.2ka resulting in a reversal of the current prevailing wind direction and supports the case for a formal Middle/Late Holocene boundary at this time.