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

ABSTRACT

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.

Key Words: eutrophication • lake restoration

¹ Contribution from Inland Waters Directorate, Dep. of Environment, Canada. Paper presented 6 Aug. 1979 in Fort Collins, Colo., at the Annual Meeting of the Am. Soc. of Agron. and Soil Sci. Soc. of Am. as part of Div. A-5, Environ. Qual.

² Chief and Research Scientist, National Water Research Inst., Western and Northern Region, Freshwater Inst., Winnipeg, Manitoba.

³ Research Scientists, National Water Research Inst., Canada Centre for Inland Waters, Burlington, Ontario.

Received for publication May 14, 1979.