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  • 1
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    Anthropogenic- and natural sources of dust in peatland during the Anthropocene (2016)
    In:  Scientific Reports
    Details
    Publication Date: 2020-02-12
    Description: As human impact have been increasing strongly over the last decades, it is crucial to distinguish human-induced dust sources from natural ones in order to define the boundary of a newly proposed epoch - the Anthropocene. Here, we track anthropogenic signatures and natural geochemical anomalies in the Mukhrino peatland, Western Siberia. Human activity was recorded there from cal AD 1958 (±6). Anthropogenic spheroidal aluminosilicates clearly identify the beginning of industrial development and are proposed as a new indicator of the Anthropocene. In cal AD 1963 (±5), greatly elevated dust deposition and an increase in REE serve to show that the geochemistry of elements in the peat can be evidence of nuclear weapon testing; such constituted an enormous force blowing soil dust into the atmosphere. Among the natural dust sources, minor signals of dryness and of the Tunguska cosmic body (TCB) impact were noted. The TCB impact was indirectly confirmed by an unusual occurrence of mullite in the peat.
    Type: info:eu-repo/semantics/article
    Format: application/pdf
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  • 2
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    Hydrological dynamics and fire history of the last 1300years in western Siberia reconstructed from a high-resolution, ombrotrophic peat archive (2015)
    In:  Quaternary Research
    Details
    Publication Date: 2020-02-12
    Description: Siberian peatlands provide records of past changes in the continental climate of Eurasia. We analyzed a core from Mukhrino mire in western Siberia to reconstruct environmental change in this region over the last 1300 years. The pollen analysis revealed little variation of local pine-birch forests. A testate amoebae transfer function was used to generate a quantitative water-table reconstruction; pollen, plant macrofossils, and charcoal were analyzed to reconstruct changes in vegetation and fire activity. The study revealed that Mukhrino mire was wet until the Little Ice Age (LIA), when drought was recorded. Dry conditions during the LIA are consistent with other studies from central and eastern Europe, and with the pattern of carbon accumulation across the Northern Hemisphere. A significant increase in fire activity between ca. AD 1975 and 1990 may be associated with the development of the nearby city of Khanty-Mansiysk, as well as with the prevailing positive Arctic Oscillation.
    Type: info:eu-repo/semantics/article
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  • 3
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    Impacts of hypoxia on the structure and processes in pelagic communities (zooplankton, macro-invertebrates and fish). (2010)
    In:  EPIC3Biogeosciences, 7, pp. 1669-1699
    Details
    Publication Date: 2019-07-16
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 4
    Electronic Resource
    Electronic Resource
    Constant-Current Potentiometry in the Coulometric Determination of Bromine Numbers. (1963)
    s.l. : American Chemical Society
    Analytical chemistry 35 (1963), S. 1133-1136 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60202a051
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  • 5
    Electronic Resource
    Electronic Resource
    Pulse polarographic study of the cystine catalytic hydrogen wave (1969)
    s.l. : American Chemical Society
    Analytical chemistry 41 (1969), S. 1567-1570 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60281a001
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  • 6
    Electronic Resource
    Electronic Resource
    Pulse Polarographic Determination of Nickel and Vanadium. (1965)
    s.l. : American Chemical Society
    Analytical chemistry 37 (1965), S. 1102-1103 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60228a006
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  • 7
    Electronic Resource
    Electronic Resource
    The Microbial Loop at the Surface of a Peatland:Structure, Function, and Impact of Nutrient Input (1998)
    Springer
    Microbial ecology 35 (1998), S. 83-93 
    Details
    ISSN: 1432-184X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The aim of this study was to assess the structure and function of the microbial loop in a peatland of the French Massif central, and the impact of fertilization on the different microbial communities. In terms of biomass, testate Amoeba (48% of the total microbial biomass), heterotrophic bacteria (15%), cyanobacteria (14%) and Bacillariophyceae (13%) were the dominant groups of microorganisms. Other microalgae (7%), ciliates (2%) and heterotrophic flagellates (1%) accounted for only a low proportion of total microbial biomass. The relative importance of heterotrophic microorganisms was higher than in marine or lacustrine environments. In addition, ciliates and heterotrophic flagellates only constituted a small proportion of the total protozoan biomass, which was heavily dominated by testate amoeba. Thus, the structure of the protist community in the subaquatic peatland was completely different from that reported for lakes or marine environments. In other aspects, the supply of nutrients (PKCa and NPKCa) resulted in increases of the relative biomasses of heterotrophic bacteria, Bacillariophyceae, and ciliates and by a decrease in the relative proportion of testate amoeba and of other microalgae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002489900062
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  • 8
    Electronic Resource
    Electronic Resource
    Horizontal Distribution Patterns of Testate Amoebae (Protozoa) in a Sphagnum magellanicum Carpet (2000)
    Springer
    Microbial ecology 39 (2000), S. 290 -300 
    Details
    ISSN: 1432-184X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The distribution of soil microorganisms is generally believed to be patchy and to reflect habitat heterogeneity. Despite this general rule, the amount of existing data on species distribution patterns is scarce. Testate amoebae (Protozoa; Rhizopoda) are an important component of soil microbial communities and are increasingly used in ecological and paleoecological studies of Sphagnum-dominated peatlands, but data on the spatial structure of communities are completely lacking. This is an important aspect since quantitative models used for paleoecological reconstruction and monitoring are based on species assemblages. We explored the distribution patterns of testate amoebae distribution in a macroscopically homogeneous Sphagnum carpet, down to a scale of several centimeters. Distributions maps of the species and spatially constrained sample groups were produced. Multivariate and individual spatial autocorrelations were calculated. The importance of spatial structure was quantified by canonical correspondence analysis. Our ultimate goal is to find the finest resolution of environmental monitoring using testate amoebae. The distribution patterns differed among species, resulting in a complex spatial structure of the species assemblage in a whole. Spatial structure accounted for 36% of the total variation of species abundance in a canonical correspondence analysis constrained by spatial variables. This structure was partly correlated to altitude (microtopography) at a very fine scale. These results confirmed the existence of significant broad- and fine-scale spatial structures within testate amoebae communities that could in part be interpreted as effects of ecological gradients. This shows that, on a surface area of 0.25 m2, ecological conditions which look uniform from a macroscopic point of view are not perceived as such by Sphagnum-inhabiting organisms. Therefore, testate amoebae could prove very useful to monitor fine-scale ecological processes or disturbances. Studies of the species' spatial distribution patterns in combination with autoecological studies are needed and should be included in the toolbox of biomonitoring itself.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002489900187
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  • 9
    Electronic Resource
    Electronic Resource
    A study of the response properties of retinula cells of flies using nonlinear identification theory (1975)
    Springer
    Biological cybernetics 19 (1975), S. 147-158 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract The functional properties of retinula cells of the fly Calliphora crythrocephala (wild type) have been determined through the application of nonlinear identification theory using white-gaussian stimulus functions. These results are also compared to similiar recordings of lamina cells. The accuracy of the resulting models is shown by the fact that those obtained from just 30 sec tests predict the actual total responses to the white-gaussian stimuli with a mean square error of about 5% and for a 2200 sec test the error is reduced to 2%. It has been shown that the second order kernels define all of the nonlinear properties and are the primary terms in the models for describing the variations in functional responses with illumination level, changing adaptation conditions and even variations in the conditions of the intracellular preparations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00337254
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  • 10
    Electronic Resource
    Electronic Resource
    The fundamental mechanism of motion detection in the insect visual system (1973)
    Springer
    Biological cybernetics 12 (1973), S. 64-73 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract The basic principle of motion detection by fibers of the optic lobes of flies were studied with a pair of small spots and a variety of paired intensity variations. These show that the process of correlation of adjacent field regions to detect motion is confined to a small area. The presence of small field units with small field adjacent inhibition in the system was detected. The optimum spot spacing for maximum reactions corresponded to the facet spacings. Selective motion detection responses from minimum information consisting of evaluating the difference between the spot intensities and the rate of change of the trailing spot relative to the motion direction was shown. However, additional properties best determined by white-noise experiments designed from this study were found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00272462
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