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  • Artikel  (54)
  • paleolimnology  (54)
  • Springer  (54)
  • American Chemical Society (ACS)
  • 2005-2009
  • 1990-1994
  • 1980-1984  (54)
  • 2005
  • 1983  (54)
  • 1980
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  • Artikel  (54)
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  • Springer  (54)
  • American Chemical Society (ACS)
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  • 2005-2009
  • 1990-1994
  • 1980-1984  (54)
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  • 11
    Digitale Medien
    Digitale Medien
    Interpretation of lake quality from contemporary diatom assemblages (1983)
    Springer
    Hydrobiologia 103 (1983), S. 91-97 
    Details
    ISSN: 1573-5117
    Schlagwort(e): paleolimnology ; diatoms ; assemblage indicators ; Finland
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Diatom assemblages from the topmost sediment of 49 lakes were ordinated by means of a program for detrended correspondence analysis and reciprocal averaging (Decorana). Five lake groups were separated, each having more or less characteristic diatom assemblages and water quality. Shifts from one group to another caused by factors such as acidification, artificial drainage, diffuse nutrient loading and sewage are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00028434
    Standort Signatur Erwartet Verfügbarkeit
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  • 12
    Digitale Medien
    Digitale Medien
    Transfer functions for estimating paleoecological conditions (pH) from East African diatoms (1983)
    Springer
    Hydrobiologia 103 (1983), S. 85-90 
    Details
    ISSN: 1573-5117
    Schlagwort(e): paleolimnology ; diatoms ; East Africa ; transfer functions ; pH-indicators
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Our purpose is to establish the quantitative relationship between recent diatom floras and ecological parameters, in order to extrapolate the results to the past. The parameter pH is here considered as an example. This work is based on the study of about I60 diatom samples from East Africa and of their corresponding biotopes. We propose some statistical methods to interpret the data. Correspondence analysis allows us to define the pH-indicator species. The regression calculations allow pH values to be calculated using the percentage of the diatom species in a sample.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00028433
    Standort Signatur Erwartet Verfügbarkeit
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  • 13
    Digitale Medien
    Digitale Medien
    Bacterial decomposition of organic matter in lacustrine sediments (1983)
    Springer
    Hydrobiologia 103 (1983), S. 99-102 
    Details
    ISSN: 1573-5117
    Schlagwort(e): paleolimnology ; organic matter ; bacteria ; aerobic decomposition ; oxygen consumption
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The investigations were carried out in lakes situated in the forest zone (Karelian Isthmus, Baltic zone, South Ural) and in the forest-steppe (South Ural) of the USSR. The lakes differ in their bioproductivity and in the intensity of their human influence. The amount of organic matter accumulating in the sediments is closely related to production and decomposition processes in the trophogenic layer. Processes of organic matter transformation were found to be most active in the uppermost sediment. The quantity of bacteria shows no correlation with the organic matter content of the sediment. Increase in organic matter, up to 70–80% of dry weight, is often accompanied by a decrease in bottom bacteria. The intensity of aerobic decomposition of the labile organic matter can be judged from the oxygen demand of the sediments. However, it is important to differentiate between chemical and biological oxidation processes. The quantity of bottom bacteria correlates closely with the value of oxygen consumption only in cases of high sediment redox potentials.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00028435
    Standort Signatur Erwartet Verfügbarkeit
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  • 14
    Digitale Medien
    Digitale Medien
    Relationship between sedimentary pigments and primary production: evidence from core analyses of twelve Italian lakes (1983)
    Springer
    Hydrobiologia 103 (1983), S. 103-106 
    Details
    ISSN: 1573-5117
    Schlagwort(e): paleolimnology ; sedimentary pigments ; primary production ; core analyses
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract A statistically significant correlation of the type y = axb between sedimentary plant pigments and contemporary algal primary production has been found in a study of the recent trophic evolution of twelve Italian lakes. The equation is used to assess baseline production levels in periods (50–70 years ago) when human influence was low.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00028436
    Standort Signatur Erwartet Verfügbarkeit
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  • 15
    Digitale Medien
    Digitale Medien
    The mythical concept of eutrophication (1983)
    Springer
    Hydrobiologia 103 (1983), S. 107-111 
    Details
    ISSN: 1573-5117
    Schlagwort(e): paleolimnology ; lake ontogeny ; lake succession ; eutrophication
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Paleolimnologists frequently invoke the term ‘eutrophication’ for describing apparent enrichment phases in the history of a lake. I argue that this term is often used incorrectly and that alternative explanations can serve as more accurate descriptions. Increased organic content in the sedimentary record may result from increased nutrient availability (eutrophication), but it can also reflect decreased residence time of water, or changes in biotic interactions, or changes in lake morphometry. Additionally, I argue that ‘eutrophication’ is an inappropriate term for describing the aging process of lakes. Lake ontogeny is the preferred term, as it does not imply directional changes in nutrients, nor in community structure.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00028437
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  • 16
    Digitale Medien
    Digitale Medien
    Eutrophication and the disappearance of lakes in the Brodnica Lake District, Northern Poland as a result of human interference (1983)
    Springer
    Hydrobiologia 103 (1983), S. 165-168 
    Details
    ISSN: 1573-5117
    Schlagwort(e): paleolimnology ; lakes ; eutrophication
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Problems relating to the disappearance and eutrophication of lakes as a result of human activity are presented. A study area was selected located in an agricultural/forest region where human influence on lakes used to be minimal. In the past 25 years a number of lakes have completely disappeared and others have become rapidly enriched. Human interference has included: the pulling down of water mills, drainage and river canalisation, construction of holiday resorts, development of intensive farming, increased mineral fertilization, and the extension of roads and road traffic.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00028446
    Standort Signatur Erwartet Verfügbarkeit
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  • 17
    Digitale Medien
    Digitale Medien
    Zn, P and ATP in the sediments of two lakes in South Finland (1983)
    Springer
    Hydrobiologia 103 (1983), S. 177-179 
    Details
    ISSN: 1573-5117
    Schlagwort(e): paleolimnology ; sediment chemistry ; heavy metals ; ATP
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract This investigation is concerned with the impact of industrial and municipal waste discharge on lakes near the city of Tampere, Finland. The record of P, Zn and ATP in the recent sediments of Vanajavesi I, a polluted lake, and Mallasvesi, a largely unpolluted lake, are compared.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00028448
    Standort Signatur Erwartet Verfügbarkeit
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  • 18
    Digitale Medien
    Digitale Medien
    An attempt to trace eutrophication in a shallow lake (Balaton, Hungary) using chironomids (1983)
    Springer
    Hydrobiologia 103 (1983), S. 169-175 
    Details
    ISSN: 1573-5117
    Schlagwort(e): paleolimnology ; Chironomidae ; subfossil remains ; shallow lake ; eutrophication ; Lake Balaton
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Lake Balaton, the largest shallow lake in Central Europe, is about 20 000 years old. An enormous increase in tourism and the disproportionate building development of the last few decades has resulted in the acceleration of eutrophication in the lake. Widespread research to reveal the causes of water-quality deterioration and possible ways of protection against it have recently started. The investigation of the larvae of non-biting midges (Diptera: Chironomidae) in the sediment of the open-water zone has also begun. The contemporary faunal composition strongly correlates with the trophic gradient along the longitudinal axis of the lake. We therefore supposed that the eutrophication process should be identifiable from the analysis of subfossil chironomid head capsules from the upper (15 cm thick) layer of the sediment. We found that quantitative results could only be obtained when fragments as well as relatively intact head capsules are considered. Our data verify that the originally oligo-mesotrophic community has been gradually replaced by eutrophic species in a west to east direction. Large-bodied larvae belonging to the Chironomus plumosus group mix the sediment down to 15 cm as they build their tubes and consequently alter the original proportions of head capsules at the different levels. So the sequence of communities through the sediment-layers is not quite reliable.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00028447
    Standort Signatur Erwartet Verfügbarkeit
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  • 19
    Digitale Medien
    Digitale Medien
    Clostridium perfringens (Holland) as an indicator of human effluent in the sediment of Lake Tuomiojärvi, central Finland (1983)
    Springer
    Hydrobiologia 103 (1983), S. 181-184 
    Details
    ISSN: 1573-5117
    Schlagwort(e): paleolimnology ; Clostridium perfringens ; sewage pollution ; eutrophication
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The horizontal and vertical distribution of the gram-positive, non-motile, spore-forming and rod-shaped bacterium Clostridium perfringens Holland was studied. The aim of the study was to estimate the quantity of C. perfringens at different depths of the sediment and evaluate the effect of human effluent which the lake received between 1940 and 1956. C. perfringens lives in the colon of man. Because it is spore forming and cannot multiply under a temperature of 20 °C and, according to the studies of Seppänen et al. (1979) it can be at least 300 years old, it may be a suitable paleolimnological indicator of pollution by human effluent. The results showed that the amounts of Clostridium increased at the same level where redox potential decreased in the sediment due to the beginning of effluent disposal at a depth of 40 mm. The maximum number of Clostridium colonies occurred between 0–30 mm depth.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00028449
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  • 20
    Digitale Medien
    Digitale Medien
    Recent geologic development of Lake Michigan (U.S.A.) (1983)
    Springer
    Hydrobiologia 103 (1983), S. 193-198 
    Details
    ISSN: 1573-5117
    Schlagwort(e): paleolimnology ; Lake Michigan ; geochemistry ; stratigraphy ; Quaternary ; trace elements
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The stresses placed on Lake Michigan since the advent of industrialization require knowledge of the sedimentology of the whole lake in order to make informed decisions for environmental planning. Sediment accumulation rates are low: areas of the lake receiving the most sediment average only 1 mm a−1; deep-water basins average 0.1 to 0.5 mm a−1; and large areas are not receiving any sediment. Sediment was deposited rapidly (typically 5 mm a−1), in the form of rock flour, during the deglaciation of both Lake Michigan and Lake Superior Basins. Then the rate of accumulation decreased by 80–90% and has remained relatively constant since final deglaciation. Because active sedimentation occurs mostly in the deep water areas of the lake, the sediment remains undisturbed and contains a record of the chemical history of the lake.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00028451
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