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Abstract

Several experiments to evaluate rates of nitrate and ammonium uptake by phytoplankton were conducted using methodology described in the 1970 report. Because of breakdowns of the mass spectrometer most experiments have not been analysed. However, preliminary data from Swan Lake indicate that the hypothesized relation between nutrient concentration and Kt may hold; as dissolved nitrate concentrations decreased from 24.3 μM/liter to 2.5 μM/Liter, Kt decreased from 1.17 μM/liter to 0.0004 μM/liter. Phytoplankton counts are nearing completion, and in conjunction with autoradiographs should aid in interpreting the data on a species or generic level as well as on the community level. Project Number 165.

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