Phosphorus uptake by microplankton in estuarine and coastal shelf waters near Sapelo Island,Georgia, U.S.A. |
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| Authors: | T Berman |
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| Institution: | 1. Kinneret Limnological Laboratory, Israel Oceanographic & Limnological Research Ltd., P.O. Box 345, Tiberias, Israel
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| Abstract: | 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 1 per h. Generally, when isotopic equilibrium was reached after the addition of32P-orthophosphate, significant amounts of32P-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 (<1μm); 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 (>1μm). The time course of32P-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. |
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