Phytoplankton uptake of ammonium and urea during growth on oxidized forms of nitrogen |
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| Authors: | Horrigan SG; McCarthy JJ |
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| Institution: | 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 |
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| Abstract: | Uptake capabilities for ammonium (NH4+) and urea by diatoms(Thalassiosira pseudonana and Skeletonema costatum) growingon oxidized forms of nitrogen were studied in short-term uptakeexperiments. Even when nutrient-saturated, an enhanced uptakecapability not coupled with the growth rate was present forNH4+ and urea. No such enhanced uptake ability was seen forNO2– or NO3– under either nutrient-saturated ornutrient-depleted conditions. The presence of NH4+ decreasedthe enhanced ability to take up urea, but the urea uptake ratein 5 min incubations remained greater than the growth rate evenwhen NH4+ was present. |
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