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Phosphorus Uptake by Microplankton in Estuarine and Coastal Shelf Waters near Sapelo Island, Georgia, U. S. A.
Vol. 6, No. 2 (Jun., 1983), pp. 160-166
Published by: Coastal and Estuarine Research Federation
Stable URL: http://www.jstor.org/stable/1351706
Page Count: 7
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The residence times of orthophosphate measured in midsummer in estuarine and coastal shelf waters near Sapelo Island, Georgia, ranged from 1.6 to 105 h. Rates of orthophosphate uptake by microplankton varied from 1.4 to 62.2 μg P per l per h. Generally, when isotopic equilibrium was reached after the addition of 32 P-orthophosphate, significant amounts of 32 P-remained in solution, suggesting that the supply of phosphorus to microplankton was not limiting in these waters. In coastal shelf waters, the majority of phosphorus uptake (>60%) was associated with small microorganisms (<1 μm); whereas in estuarine waters or in a Gulf Stream intrusion usually a proportionately greater amount of phosphorus was incorporated into larger algae, or clumped or attached bacteria (>1 μm). The time course of 32 P-orthophosphate incorporation into a cold, 10% TCA insoluble, cellular fraction was more consistently linear than into whole cells. This criterion may be useful for comparative studies of phosphorus utilization by microplankton.
Estuaries © 1983 Coastal and Estuarine Research Federation