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The trophic history of Enäjärvi, SW Finland, with special reference to its restoration problems

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Abstract

The eutrophicated Enäjärvi was studied by paleolimnological analyses and sediment mapping. The sedimentary record indicates that the lake nutrient balance had deteriorated due to lowering of the lake water level in the year 1928. From that event onwards Chironomus plumosus and Cyclotella astraea characterize the chironomid and diatom communities. The concentrations of sedimentary total and mobile phosphorus show that since then the internal load of phosphorus has controlled the nutrient cycle of the lake. The areal distribution of mobile phosphorus can be explained by dominant wind directions and wind resuspension of the sediment is the key factor in the nutrient cycle. Restoration of Enäjärvi must be based on actions which stabilize the surface sediment and improve its natural phosphorus-binding capacity. They include the regulation of lake water to as high a level as possible and the removal of the majority of roach.

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Authors and Affiliations

  1. Department of Quaternary geology, University of Turku, SF-20500, Turku, Finland

    V.-P. Salonen & A. Itkonen

  2. Department of Geology, Division of Geology and Palaeontology, University of Helsinki, SF-00170, Helsinki, Finland

    P. Alhonen

  3. Geological Survey of Finland, SF-02150, Espoo, Finland

    V.-P. Salonen & H. Olander

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  1. V.-P. Salonen
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  2. P. Alhonen
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  3. A. Itkonen
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  4. H. Olander
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Salonen, VP., Alhonen, P., Itkonen, A. et al. The trophic history of Enäjärvi, SW Finland, with special reference to its restoration problems. Hydrobiologia 268, 147–162 (1993). https://doi.org/10.1007/BF00014050

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  • DOI: https://doi.org/10.1007/BF00014050

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