FN Archimer Export Format
PT J
TI Interactions between ammonium and urea uptake by five strains of Alexandrium catenella (Dinophyceae) in culture
BT 
AF JAUZEIN, Cecile
   LOUREIRO, Sofia
   GARCES, Esther
   COLLOS, Yves
AS 1:1,2;2:3;3:3;4:1;
FF 1:PDG-DOP-LER-LERLR;2:;3:;4:;
C1 Univ Montpellier 2, CCO93, Lab Ecosyst Lagunaires, UMR CNRS 5119, F-34095 Montpellier 5, France.
   IFREMER, Lab Environm Ressources, F-34203 Sete, France.
   CSIC, CMIMA, Inst Ciencias Mar, Dept Biol Marina, E-08003 Barcelona, Catalonia, Spain.
C2 UNIV MONTPELLIER, FRANCE
   IFREMER, FRANCE
   CSIC, SPAIN
SI SETE
SE PDG-DOP-LER-LERLR
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-europe
   copubli-univ-france
IF 2.19
TC 18
UR https://archimer.ifremer.fr/doc/2008/publication-6432.pdf
LA English
DT Article
DE ;Strain variability;Interactions;Urea;Ammonium;Alexandrium catenella
AB Short-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. catenella from 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 mu gatN l(-1)) was measured as a function of the increasing concentration of the other nutrient (0 to 10 mu gatN l(-1)). Simultaneous N uptake rates of the distinct nitrogen sources were obtained from N-15-NH4+ and N-15-urea incorporation measurements. A strong inhibition of urea uptake by NH4+ (maximum inhibition, I-max > 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. catenella cells 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 mu gatN l(-1)) and high Urea concentrations (as 10 mu gatN l(-1)). These N uptake characteristics may reflect particular metabolic adaptations by the strains to their respective environment.
PY 2008
PD DEC
SO Aquatic Microbial Ecology
SN 0948-3055
PU Inter-Research
VL 53
IS 3
UT 000262683300003
BP 271
EP 280
DI 10.3354/ame01249
ID 6432
ER

EF