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This article in JEQ

  1. Vol. 9 No. 2, p. 199-206
    Received: May 14, 1979



Historical Changes and Relationship to Internal Loading of Sediment Phosphorus Forms in Hypertrophic Prairie Lakes1

  1. R. J. Allan2,
  2. J. D. H. Williams3,
  3. S. R. Joshi3 and
  4. W. F. Warwick2



Nonapatite phosphorus concentrations in sediment cores from five mainstem lakes and two sloughs indicate that most Prairie water bodies were eutrophic prior to European settlement and agricultural development of the region. Nonapatite phosphorus increases towards the sediment surface are attributed to urban and/or agricultural effluents. Organic phosphorus increases towards the sediment surface are considered as evidence of post-settlement increases in lake productivity. Surface sediment increases in nonapatite inorganic phosphorus are the result of urban and/or agricultural effluents modified by upward migration and pooling. Declines in surface sediment nonapatite inorganic phosphorus are evidence of internal loading.

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