1980•Canadian Journal of Fisheries and Aquatic SciencesRequires access

Hypolimnion Injection of Nutrient Effluents as a Method for Reducing Eutrophication

D. W. Schindler, T. Ruszczynski, Everett Fee

Abstract

Injection of nutrients into the anoxic hypolimnion of a small Precambrian Shield lake for 5 yr caused less of a eutrophication problem than discharging nutrients into surface waters. Phytoplankton standing crop and production in the whole lake averaged only 10–21% of values in a nearby lake fertilized at the surface. Five-year averages for the epilimnion only were still lower: 5–8% of those in the surface-fertilized lake. Analysis of long-term trends in chlorophyll and nutrient concentrations revealed much slower rates of increase than in surface-fertilized lakes.Key words: eutrophication, hypolimnion injection, sediment–water interaction, nutrients, experimental lakes

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Key concepts: Hypolimnion, Epilimnion, Eutrophication, Nutrient, Environmental science, Standing crop, Phytoplankton, Sediment