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  • Articles  (3)
  • Quantum information
  • sediment
  • 1975-1979  (3)
  • Biology  (3)
  • Physics
  • Energy, Environment Protection, Nuclear Power Engineering
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  • Articles  (3)
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  • Biology  (3)
  • Physics
  • Energy, Environment Protection, Nuclear Power Engineering
  • 1
    Electronic Resource
    Electronic Resource
    The chemical environment of tubificid and lumbriculid worms according to the pollution level of the sediment (1979)
    Springer
    Hydrobiologia 65 (1979), S. 273-282 
    Details
    ISSN: 1573-5117
    Keywords: Heavy metals ; benthic fauna ; Tubificidae ; Lumbriculidae ; indicators of pollution ; sediment ; pollution ; eutrophication
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In Lake Geneva (Switzerland), 14 tubificid and 2 lumbriculid worm species were collected in a total of 170 samples of sediment. The sediment was analysed through ten chemical variables: organic carbon, total phosphorus, Cd, Zn, Sn, Pb, Hg, Cu, Cr, Mn. The chemical environment characterizing the presence of every worm species was defined by the mean value of each of these ten variables in all samples where the species was found. The multivariate comparison of the chemical environment typical of every species enabled six groups of species to be distinguished, each characterized by the high value of one chemical variable: (1) Peloscolex ferox, Potamothrix hammoniensis, Limnodrilus claparedeanus, and Cd. (2) Psammoryctides barbatus, and Zn. (3) Limnodrilus hofmeisteri, L. udekemianus, L. profundicola, and total P. (4) Potamothrix heuscheri, Aulodriluspluriseta, A. limnobius, Tubifex tubifex, Ilyodrilus templetoni, Stylodrilus heringianus, and organic C. (5) Potamothrixvejdovskyi, and, Hg. (6) Peloscolex velutinus, Stylodrilus lemani, and Mn. Pollution level of the sediment decreased from group 1 to 6, so each of these groups may be used to define a different level of pollution. The pooled coefficient of variation of the ten chemical variables used to define the chemical environment of each species diminished from group 1 to 6: the most opportunistic species colonized the most polluted areas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00038868
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  • 2
    Electronic Resource
    Electronic Resource
    Changes in phosphorus concentrations in a eutrophic lake as a result of macrophyte-kill following herbicide application (1979)
    Springer
    Hydrobiologia 66 (1979), S. 105-111 
    Details
    ISSN: 1573-5117
    Keywords: Phosphorus ; herbicide ; diquat ; nutrient cycling ; sediment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Phosphorus (P) concentrations in water and sediment of a highly eutrophic lake were monitored before and after application of diquat to control the macrophyte Potamogeton crispus. Only a relatively small and short-term increase in P concentration in water occurred shortly after plant die-off resulting from herbicide application. Phosphorus concentrations in shallow water sediments decreased during the summer, and those in deep water sediments increased. Although a large increase in P concentration in the water occurred in late summer, it was not attributed to diquat. No major secondary effects of herbicide application were found during this study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00032039
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  • 3
    Electronic Resource
    Electronic Resource
    The influence of chironomus plumosus larvae on the exchange of dissolved substances between sediment and water (1979)
    Springer
    Hydrobiologia 66 (1979), S. 149-159 
    Details
    ISSN: 1573-5117
    Keywords: Chironomus ; sediment ; exchange ; nitrogen ; phosphorus ; silica ; iron ; manganese
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract 4th instar Chironomus plumosus larvae (about 1000·m−2) were added to tubes containing sediment and overlying water. At a temperature of 20°C the larvae greatly increased the trasnport of silica, phosphorus and iron from the sediment to the water. Oxygen concentrations did not influence the exchange of silica. For two non-calcareous sediments the exchange of phosphorus and iron was much higher under anaerobic than under aerobic conditions while the difference was small for sediment from a hardwater lake. Exchange of inorganic nitrogen was little influenced by added chironomid larvae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00032045
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