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JOURNAL OF PLANKTON RESEARCH | VOLUME 19 | NUMBER 6 | PAGES 759-770 | 1997
© Oxford University Press

other

Uptake of dissolved nitrogen by phytoplankton in a eutrophic subtropical lake

Binhe Gu, Karl E. Havens1, Claire L. Schelske and Barry H. Rosen2

Department of Fisheries and Aquatic Sciences, University of Florida 7922 71st Street, Gainesville, FL 32653 1Ecosystem Restoration Department South Florida Water Management District Gun Club Road, West Palm Beach, FL 33416, USA 2Planning Department, South Florida Water Management District Gun Club Road, West Palm Beach, FL 33416, USA

Received on September 11, 1996; accepted on January 24, 1997 Uptake rates for ananonium, nitrate, urea and dinitrogen by phytoplankton in Lake Okeechobee ranged from 0.58 to 1.52 µmol 1–1 h–1 among four representative stations during a short-term study period. Ammonium accounted for 53% of the uptake rates, followed by nitrate (19%), urea (16%) and dinitrogen (12%). Half-saturation constants for nitrogen (N) uptake ranged from 8.70 µmol 1–1 for ammonium, 2.07 iimol 1–1 for urea and 2.21 µmol 1–1 for nitrate at South station. This study reveals spatially varying N uptake rates, particularly N fixation, within a large eutrophic lake.


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