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JOURNAL OF PLANKTON RESEARCH | VOLUME 18 | NUMBER 6 | PAGES 1041-1045 | 1996
© Oxford University Press

other

The relative preference index (RPI) for phytoplankton nitrogen use is only weakly related to physiological preference

Willem Stolte and Roel Riegman

Netherlands Institute for Sea Research, Department of Biological Oceanography PO Box 59, 1790 AB Den Burg, The Netherlands

Received on September 20, 1995; accepted on January 15, 1996 In field studies where the uptake of different nitrogen compounds in phytoplankton is studied, a relative preference index (RPI) is often used which describes uptake relative to the abundance of a particular nitrogen compound, usually ammonium. This index can easily be misused when it is applied as a physiological preference indicator. In this study, it is shown that the index may be more dependent on nutrient concentrations than on the algal preference for ammonium under certain circumstances.


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