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Interactions between ammonium and urea uptake by five strains of Alexandrium catenella (Dinophyceae) in culture

AutorJauzein, Cécile; Loureiro, Sofía ; Garcés, Esther ; Collos, Yves
Palabras claveAlexandrium catenella
Strain variability
Fecha de publicacióndic-2008
EditorInter Research
CitaciónAquatic Microbial Ecology 53(3): 271-280 (2008)
ResumenShort-term experiments were carried out to investigate whether interactions between ammonium (NH4+) and urea uptake regulate the total nitrogen assimilation of the toxic dinoflagellate Alexandrium catenella. To test for strain variability, 5 strains of A. catenellafrom the NW Mediterranean were used: 3 strains from the Thau lagoon (southern France) and 2 strains from the Catalonia basin (Spain). For each strain, the uptake rate of 1 nutrient (NH4+or urea) at a reference concentration (10 μgatN l–1) was measured as a function of the increasing concentration of the other nutrient (0to 10 μgatN l–1). Simultaneous N uptake rates of the distinct nitrogen sources were obtained from 15 N-NH4+ and 15N-urea incorporation measurements. A strong inhibition of urea uptake by NH4+ (maximum inhibition, Imax> 55%) was observed exclusively for the French strains. No influence of urea on the NH4+-uptake rate was noted for any strain. Estimation of total N uptake rates revealed that the N-urea uptake inhibition was not a competitive disadvantage for A. catenellacells considering that the reduced N-urea uptake was more than compensated for by NH4+uptake. Furthermore, the computation of composite kinetic parameters from total N uptake data suggested that French strains were more competitive than the Spanish ones in an environment characterized by low NH4+ concentrations (≤5 μgatN l–1) and high urea concentrations (as 10 μgatN l–1). These N uptake characteristics may reflect particular metabolic adaptations by the strains to their respective environment.
Descripción10 pages, 3 figures, 2 tables
Versión del editorhttp://dx.doi.org/ 10.3354/ame01249
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