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  • Lake Constance  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Phosphorus transport to the bottom of Lake Constance (1989)
    Springer
    Aquatic sciences 51 (1989), S. 181-191 
    Details
    ISSN: 1420-9055
    Keywords: Phosphorus ; sedimentation ; Lake Constance ; particles ; calcite POM
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Despite decreasing nutrient loading of Lake Constance over the past few years, annual sedimentation rates of dry matter remained nearly constant at a level of about 1000 gm−2y−1. The phosphorus content in settling material varied between 0.13 and 0.22% of dry weight. Phosphorus was transported to the lake bottom mainly by POM and by coprecipitation with authigenically formed calcite (estimated from results of laboratory studies). Adsorption to sinking particles of allochthonous origin was of minor importance. The effect of a self-cleaning mechanism is discussed with regard to continuously declining contents of dissolved phosphorus in Lake Constance since 1981, due to external sanitation measures in the drainage area.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00877741
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Calcite patchiness in Lake Constance as viewed by LANDSAT-TM (1995)
    Springer
    Aquatic sciences 57 (1995), S. 338-349 
    Details
    ISSN: 1420-9055
    Keywords: Patchiness ; calcite ; Lake Constance ; LANDSAT-Thematic Mapper
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Calcite precipitation is a phenomenon occuring in most hardwater lakes world-wide. On May 5th, 1990, a whiting in Lake Constance was observed by LANDSAT for the first time. Physical, chemical and biological ground data sets prove that the observed structures are caused by calcite precipitation. This satellite observation provides information about the patchiness of calcite crystals suspended in the surface water of the lake western basin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00878397
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  • 3
    Electronic Resource
    Electronic Resource
    Heterogeneously nucleated calcite precipitation in Lake Constance. A short time resolution study (1990)
    Springer
    Aquatic sciences 52 (1990), S. 176-197 
    Details
    ISSN: 1420-9055
    Keywords: Calcite ; precipitation ; heterogeneous nucleation by algae ; Lake Constance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Calcite precipitation in spring 1988 in Lake Constance was studied by measuring physical, chemical and biological parameters in daily intervals. Algae triggering calcite precipitation in spring after an induction period of 1 day wereStephanodiscus hantzschii andChlorella spp. whereas no time lag concerning maximum saturation index was observed. Number and size distribution of crystals were determined by microscopical methods. Simple equations were given for estimation of the precipitated mass of calcite by approximating the volume of calcite crystals by simple geometric bodies and multiplying by crystal numbers. Particulate calcium was analysed after dissolving suspended matter and amounted to 90% of inorganic dry weight. Crystals were observed for the first time after dissolved phosphorus was no more detectable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00902379
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