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Journal of Plankton Research, Vol 21, 355-371, Copyright © 1999 by Oxford University Press

ORIGINAL ARTICLES

Variations in the maximum transport rates for ammonium and nitrate in the prymnesiophyte Emiliania huxleyi and the raphidophyte Heterosigma carterae

K Flynn, S Page, G Wood and C Hipkin
Swansea Algal and Plankton Research Group, School of Biological Sciences, University of Wales Swansea, Singleton Park, Swansea, SA2 8PP, UK

Changes in the maximum rates of ammonium and nitrate transport (Tmax; expressed as C-specific N transport) into Emiliana huxleyi and Heterosigma carterae were related to N status (cellular N:C). There was considerable variation in the magnitude of Tmax relative to N:C. For nitrate transport in both species and for ammonium in H.carterae, the curve linking N:C and Tmax was bell shaped; Tmax increased initially as N:C fell and then Tmax decreased. In contrast, Tmax for ammonium in E.huxleyi did not decrease to such low levels and N-specific N transport increased continually as N:C decreased. While Tmax for ammonium into E.huxleyi could be an order of magnitude higher than the N-transport rate required to support growth, for nitrate transport into both species Tmax was coupled more closely to growth rate. In H.carterae, Tmax for ammonium was up to four times that for nitrate. Relationships for ammonium and nitrate Tmax have been computed for simulations of the growth of E.huxleyi and H.carterae. The implications of these results for modelling ammonium-nitrate interactions are discussed. It is shown that attempts to obtain a relationship between Tmax and N:C from steady-state chemostat data may result in significant deviations from relationships determined using incubation techniques. Further, it is more important to obtain a good estimate for ammonium Tmax because of its dominant role in affecting the ammonium-nitrate interaction.
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