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JOURNAL OF PLANKTON RESEARCH | VOLUME 4 | NUMBER 2 | PAGES 379-389 | 1982
© Oxford University Press

research-article

Phytoplankton uptake of ammonium and urea during growth on oxidized forms of nitrogen

S.G. Horrigan1 and J.J. McCarthy2

1Institute of Marine Resources, A-018, Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 92093 2Museum of Comparative Zoology, Harvard University Cambridge, MA 02138, USA

Received on July 1, 1981; accepted on November 1, 1981 Uptake capabilities for ammonium (NH4+) and urea by diatoms (Thalassiosira pseudonana and Skeletonema costatum) growing on oxidized forms of nitrogen were studied in short-term uptake experiments. Even when nutrient-saturated, an enhanced uptake capability not coupled with the growth rate was present for NH4+ and urea. No such enhanced uptake ability was seen for NO2– or NO3– under either nutrient-saturated or nutrient-depleted conditions. The presence of NH4+ decreased the enhanced ability to take up urea, but the urea uptake rate in 5 min incubations remained greater than the growth rate even when NH4+ was present.


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