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Trophic Status Related to Sediment Chemistry of Canadian Prairie Lakes¹

ABSTRACT

Concentrations of different sediment phosphorus forms vary in the Prairie lakes studied. Extremely high surface sediment available P concentrations in the Fishing Lakes of southern Saskatchewan were related to P loading from municipal and other cultural sources. Mean available P concentrations in surface sediments from the Fishing Lakes are higher than those found in other Prairie lakes and in most other Canadian lakes. Sediment cores show that presettlement concentrations of available P in the Fishing Lakes are higher than occur today in surface sediments from culturally eutrophied lakes, such as Lake Erie, elsewhere in Canada.

Free iron is concentrated in the surface 10 to 15 cm of sediment cores from the Fishing Lakes and Lake Erie. Such a distribution, when coupled to low free Fe/available P ratios, is considered to reflect conditions favorable for P regeneration when anoxic conditions develop under winter ice cover.

For the winter of 1976–1977, a mean sediment phosphorus release rate of 8.6 mg/m² per day was calculated for the Fishing Lakes.

Key Words: sediment available phosphorus • internal loading • phosphorus regeneration • eutrophication • lake rehabilitation

¹ Contribution from Inland Waters Directorate, Dep. of Fisheries and Environ., Canada. Paper presented 28 Nov. 1976 in Houston, Tex., 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, Canada Centre for Inland Waters, Western and Northern Region, Freshwater Inst., Manitoba, and Research Scientist, Canada Centre for Inland Waters, Ontario, Canada, respectively.

Received for publication March 10, 1977.