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  • 1
    Monograph available for loan
    Monograph available for loan
    Tracking environmental change using lake sediments; Volume 5: data handling and numerical techniques (2012)
    Dordrecht : Springer
    Associated volumes
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    Call number: AWI G5-12-0041
    In: Tracking environmental change using lake sediments, Volume 5
    In: Developments in paleoenvironmental research, Volume 5
    Type of Medium: Monograph available for loan
    Pages: XVIII, 745 Seiten , Illustrationen
    ISBN: 9789400727441 , 978-94-007-2744-1
    Series Statement: Developments in paleoenvironmental research 5
    URL: http://extras.springer.com/2012/978-94-007-2744-1
    URL: https://swbplus.bsz-bw.de/cgi-bin/result_katan.pl?item=bsz357070291inh.htm
    Language: English
    Note: Contents: PART I INTRODUCTION, NUMERICAL OVERVIEW, AND DATA-SETS. - 1 The march towards the quantitative analysis of palaeolimnological data. - 2 Overview of numerical metods in Palaeolimnology. - 3 Data-Sets. - PART II NUMERICAL METHODS FOR THE ANALYSIS OF MODERN AND STRATIGRAPHICAL PALAEOLIMNOLOGICAL DATA. - 4 Introduction and overview Part II. - 5 Exploratory data analysis and data display. - Assessment of uncertainities associated with Palaeolimnological laboratory methods and microfossil analysis. - 7 Clustering and partitioning. - 8 From Classical to canonical ordination. - 9 Statistical learning in Palaeolimnology. - PART III NUMERICAL METHODS FOR THE ANALYSIS OF STRATIGRAPHICAL PALAEOLIMNOLOGICAL DATA. - 10 Introduction and overview of Part III. - 11 Analysis of stratigraphical data. - 12 Estimation of age-depth relationships. - 13 Core correlation. - 14 Quantitative environmental reconstructions from biological data. - 15 Analogue methods in Palaeolimnology. - 16 Autocorrelogram and Periodogram analysis of palaeolimnological temporal-series from lakes in Central and Western North America to assess shifts in drought conditions. - PART IV CASE STUDIES AND FUTURE DEVELOPMENTS IN QUANTITATIVE PALAEOLIMNOLOGY. - 17 Introduction and overview of Part IV. - 18 Limnological responses to environmental changes at Inter-annual to decadal time-scales. - 19 Human impacts: applications of numerical methods to evaluate surface-water acidification and eutrophication. - 20 Tracking Holocene climatic change with aquatic biota from lake sediments: case studies of commonly used numerical techniques. - 21 Conclusions and future challenges. - Glossary. - Index.
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    Branch Library: AWI Library
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  • 2
    Electronic Resource
    Electronic Resource
    Episodic fresh surface waters in the Eocene Arctic Ocean (2006)
    [s.l.] : Nature Publishing Group
    Nature 441 (2006), S. 606-609 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] It has been suggested, on the basis of modern hydrology and fully coupled palaeoclimate simulations, that the warm greenhouse conditions that characterized the early Palaeogene period (55–45 Myr ago) probably induced an intensified hydrological cycle with precipitation exceeding ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature04692
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  • 3
    Electronic Resource
    Electronic Resource
    Morphological variation within the diatom taxon Cyclotella comensis and its importance for quantitative temperature reconstructions (2001)
    Oxford UK : Blackwell Science Ltd
    Freshwater biology 46 (2001), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 1. The morphologically complex taxon Cyclotella comensis Grunow had no clear relationship with environmental parameters in a study using sediment surface samples from the Swiss Alps. The morphological heterogeneity of the taxon was investigated by applying a principal component analysis (PCA) to 9000 presence/absence descriptions of valves from surface samples of six lakes from different altitudes (15 characteristics, 100 valves each lake). The PCA allowed the classification of six morphs, which differed mainly in size and length of striae. Photographs of the morphs are shown in this paper.2. Sixty-eight sediment surface samples were analysed using these newly defined six morphs. Summer temperature explained a major part of the variance between the morphs as assessed by a redundancy analysis (RDA). Summer temperature optima and tolerances were estimated using weighted averaging.3. The influence of the revised C. comensis taxonomy on the diatom inferred summer temperature of a high alpine lake is discussed in a multiproxy context for the past 800 years.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2427.2001.00752.x
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  • 4
    Electronic Resource
    Electronic Resource
    Late-glacial and Holocene vegetation history and dynamics as shown by pollen and plant macrofossil analyses in annually laminated sediments from Soppensee, central Switzerland (1999)
    Springer
    Vegetation history and archaeobotany 8 (1999), S. 165-184 
    Details
    ISSN: 1617-6278
    Keywords: Vegetation dynamics ; Palynology ; Macroremains ; Plant diversity ; Laminated sediments ; Climate change ; Switzerland
    Source: Springer Online Journal Archives 1860-2000
    Topics: Archaeology , Biology
    Notes: Abstract The palynostratigraphy of two sediment cores from Soppensee, Central Switzerland (596 m asl) was correlated with nine regional pollen assemblage zones defined for the Swiss Plateau. This biostratigraphy shows that the sedimentary record of Soppensee includes the last 15 000 years, i.e. the entire Late-glacial and Holocene environmental history. The vegetation history of the Soppensee catchment was inferred by pollen and plant-macrofossil analyses on three different cores taken in the deepest part of the lake basin (27 m). On the basis of a high-resolution varve and calibrated radiocarbonchronology it was possible to estimate pollen accumulation rates, which together with the pollen percentage data, formed the basis for the interpretation of the past vegetation dynamics. The basal sediment dates back to the last glacial. After reforestation with juniper and birch at ca. 12 700 B.P., the vegetation changed at around 12 000 B.P. to a pine-birch woodland and at the onset of the Holocene to a mixed deciduous forest. At ca. 7000 B.P., fir expanded and dominated the vegetation with beech becoming predominant at ca. 50014C-years later until sometime during the Iron Age. Large-scale deforestation, especially during the Middle Ages, altered the vegetation cover drastically. During the Late-glacial period two distinct regressive phases in vegetation development are demonstrated, namely, the Aegelsee oscillation (equivalent to the Older Dryas biozone) and the Younger Dryas biozone. No unambiguous evidence for Holocene climatic change was detected at Soppensee. Human presence is indicated by early cereal pollen and distinct pulses of forest clearance as a result of human activity can be observed from the Neolithic period onwards.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02342718
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  • 5
    Electronic Resource
    Electronic Resource
    Influence of catchment quality and altitude on the water and sediment composition of 68 small lakes in Central Europe (1998)
    Springer
    Aquatic sciences 60 (1998), S. 316-337 
    Details
    ISSN: 1420-9055
    Keywords: Key words: Lakes, catchment, land use, climate, nitrogen, phosphate.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract: 68 lakes (63 Swiss, 2 French and 3 Italian) located in an altitudinal range between 334 and 2339m spanning a wide range of land-use have been investigated. The aim of the study was to discuss influences of geographic location, vegetation and land-use in the catchment area on the water and sediment chemistry of small lakes. Detailed quantitative description of land-use, vegetation, and climate in the watershed of all lakes was established. Surface and bottom water samples collected from each lake were analyzed for major ions and nutrients. Correlations were interpreted using linear regression analysis. Chemical parameters of water and sediment reflect the characteristics of the catchment areas. All lakes were alkaline since they were situated on calcareous bedrock. Concentrations of nitrogen and phosphorus strongly increase with increasing agricultural land-use. Na and K, however, are positively correlated with the amount of urbanization within the catchment area. These elements as well as dissolved organic carbon (DOC), Mg, Ca, and alkalinity, increase when the catchment is urbanized or used for agriculture. Total nitrogen and organic carbon in the sediments decrease distinctly if large parts of the catchment consist of bare land. No correlations between sediment composition and maximum water depth or altitude of the lakes were found.¶Striking differences in the water compositions of lakes above and below approximately 700 m of altitude were observed. Concentrations of total nitrogen and nitrate, total phosphorus, DOC, Na, K, Mg, Ca, and alkalinity are distinctly higher in most lakes below 700 m than above, and the pH of the bottom waters of these lakes is generally lower. Estimates of total nitrogen concentrations, even in remote areas, indicate that precipitation is responsible for increased background concentrations. At lower altitudes nitrogen concentrations in lakes is explained by the nitrogen loaded rain from urban areas deposited on the catchment, and with high percentages of agricultural land-use in the watershed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000270050044
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  • 6
    Electronic Resource
    Electronic Resource
    Do diatoms in the Swiss Alps reflect the length of ice-cover? (2000)
    Springer
    Aquatic sciences 62 (2000), S. 125-141 
    Details
    ISSN: 1420-9055
    Keywords: Key words: Diatoms, sediment traps, ice-cover, surface sediments, climate change.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract: Diatom analyses in the water column, sediment traps, surficial sediments as well as in a short sediment core from Hagelseewli (2339 m asl, Swiss Alps) give information about the present-day seasonal cycle of diatom blooms, taphonomic processes in the lake basin and the lake's history. Analyses of surficial sediments show that water depth and thus light and nutrient availability is the most important factor influencing the production and distribution of diatom assemblages in Hagelseewli, and that periphytic diatom valves deposited in the deeper part of the basin originate from the shallow, littoral parts and are transported to the central part by processes such as lateral currents or sediment focussing. The lake is characterised by a very short period (2-3 months) of open water. Water-column and sediment-trap data revealed that planktonic diatoms bloom during and after the ice break-up, whereas mainly periphytic Fragilaria species entered the traps during the ice-covered period. These results suggest that plankton development is strongly inhibited by the ice-cover, with longer periods of ice-cover favouring Fragilaria species in Hagelseewli. The diatom analysis of a short sediment core that includes the last five centuries revealed several changes in the proportion of planktonic diatoms to Fragilaria species. The colder phases of the Little Ice-Age correspond to phases of lower concentration of planktonic diatoms. The highest, statistically significant amount of variance in the downcore diatom data is explained by winter precipitation, which directly influences the length of the ice-cover but inversely influences the light regime.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000270050002
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  • 7
    Electronic Resource
    Electronic Resource
    Rates of change and chronological problems during the late-glacial period (1992)
    Springer
    Climate dynamics 6 (1992), S. 233-239 
    Details
    ISSN: 1432-0894
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Results of high-resolution AMS 14C dating of terrestrial plant macrofossils from late-glacial and early-Holocene lake deposits in Switzerland show three periods with constant radiocarbon ages. These plateaux of constant age occur at 12700, 10000, and 9500 y BP. A comparison of this radiocarbon chronology with a varve chronology documents discrepancies between the sidereal and the radiocarbon time-scale for the late-glacial period. The age-plateaux and the time-scale discrepancies have a significant impact on the estimation of rates of change during this period: estimates of rates of change can be very misleading if calculated on the basis of radiocarbon ages. This is illustrated by an example of estimated rates of late-glacial and early Holocene palynological change in Switzerland.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00193536
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  • 8
    Electronic Resource
    Electronic Resource
    Evidence of annual layering in Holocene sediments of Soppensee, Switzerland (1989)
    Springer
    Aquatic sciences 51 (1989), S. 19-30 
    Details
    ISSN: 1420-9055
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A succession of fine dark and light laminations, covering a time span of ca 6,000 years (Allerød to Atlantic), was observed in the sediment of Soppensee, Central Switzerland. These laminations, consisting of dark, organic and diatom-rich winter/spring layers and light calcite summer layers, are shown to be varves by means of several independent pollen and diatom analyses, as well as thin-section studies of the sediment micro-structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00877778
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  • 9
    Electronic Resource
    Electronic Resource
    Subfossil and modern diatom plankton and the paleolimnology of Rotsee (Switzerland) since 1850 (1989)
    Springer
    Aquatic sciences 51 (1989), S. 338-350 
    Details
    ISSN: 1420-9055
    Keywords: Paleolimnology ; diatoms ; lake sediments ; Lake Rot
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The diatom biostratigraphy of the topmost sediment meter of Rotsee, Central Switzerland, is characterized by a major change fromCyclotella comensis-dominated toStephanodiscus hantzschii/S. parvus-dominated assemblages. A comparison between old phytoplankton samples, taken between 1910–1930, and subfossil diatom assemblages is used for dating the upper 35 cm of the core. There is evidence that the change in dominant diatoms occurred in 1919/20, thus before the opening of an artificial inlet in 1922, and is due to increasing eutrophication. Furthermore, the sedimentary carbonate content can be used as a good indicator for past phytoplankton productivity in Rotsee.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00877176
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  • 10
    Electronic Resource
    Electronic Resource
    Book reviews (1993)
    Springer
    Journal of paleolimnology 8 (1993), S. 85-95 
    Details
    ISSN: 1573-0417
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00210059
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