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JOURNAL OF PLANKTON RESEARCH | VOLUME 11 | NUMBER 2 | PAGES 335-351 | 1989
© Oxford University Press

research-article

Inorganic nitrogen uptake and regeneration in perennially icecovered Lakes Fryxell and Vanda, Antarctica

John C. Priscu, Warwick F. Vincent1 and Clive Howard-Williams1

Department of Biological Sciences, Montana State University Bozeman, MT 59717, USA 1Taupo Research Laboratory, Department of Scientific and Industrial Research PO Box 415, Taupo, New Zealand

Received on April 6, 1988; accepted on November 17, 1988 The isotope 15N was used to examine nitrogen dynamics in Lakes Fryxell and Vanda, two permanently ice-covered Antarctic lakes. Half-saturation constants for NH4+. uptake in the shallow waters of both lakes were <10 µg N l–1; uptake kinetic experiments on populations forming the deep-chlorophyll layers of these lakes showed zero-order kinetics and could not be fitted with the Michaelis-Menten equation. Elevated uptake within the first few minutes following pulses of NH4+. and NO3– occurred in both lakes. NH4+ regeneration, determined from isotope dilution experiments, exceeded uptake at 4.6 m in Lake Fryxell, was less than uptake at 9 m in Lake Fryxell and was equal to uptake at 10 m in Lake Vanda under the experimental conditions. NO3– uptake was suppressed by NH4+ levels as low as 2 µg NH4+ -N l–1 in Lake Fryxell; the suppression was strongest in the near-surface populations. Substrate-saturated C:N uptake ratios (g:g) in Lake Fryxell decreased from 8.4 near the surface to 1.8 at the bottom of the trophogenic zone. Overall, the nitrogen dynamics in these lakes are similar to other lakes and the open ocean in that biological productivity during the austral summer is supported by regenerated nutrients.


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