FN Archimer Export Format
PT J
TI Dark metabolism and carbon-nitrogen uncoupling in the toxic dinoflagellate Alexandrium catenella (Dinophyceae)
BT 
AF JAUZEIN, CECILE
   COLLOS, Yves
   LAABIR, Mohamed
   VAQUER, Andre
AS 1:1,2;2:1;3:1;4:1;
FF 1:PDG-DOP-LER-LERLR;2:;3:;4:;
C1 Univ Montpellier 2, CNRS, IRD, Lab Ecol Syst Marins Cotiers,UMR 5119, F-34095 Montpellier 5, France.
   IFREMER, Lab LER LR, F-34203 Sete, France.
C2 UNIV MONTPELLIER, FRANCE
   IFREMER, FRANCE
SI SETE
SE PDG-DOP-LER-LERLR
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
IF 3.083
TC 13
UR https://archimer.ifremer.fr/doc/00056/16699/14199.pdf
LA English
DT Article
DE ;Diel cycle;Dark uptake;Nitrogen;Carbon;Uncoupling;Alexandrium catenella
AB Uptake rates of three potential N-sources (ammonium, nitrate and N-urea) and two potential C-sources (HCO(3)(-) and C-urea) were estimated during growth of Alexandrium catenella in both light and dark phases. According to the variations observed in (13)C-isotopic ratio, A. catenella cells were not able to use C-urea. Furthermore, decreases in (13)C cell content during darkness revealed a probably high involvement of C recently fixed in dark respiration. Dark N-uptake capacities of A. catenella were characterized by dark/light uptake ratio of 27%, 43% and 65% for NO(3)(-), NH(4)(+) and N-urea, respectively. An accumulation of C-rich compounds during the light period was highlighted through strong diel variations in C:N ratio and would provide C and energy for these dark uptake processes indicating an uncoupling between N and C metabolism. Total costs in terms of C associated with dark N-uptake and assimilation were estimated and revealed that the main part of those costs may be associated with maintenance metabolism in A. catenella cells. The relatively low C-costs of biosynthesis in darkness suggest that dark uptake and C-storage strategies correspond to a benefit in terms of competitiveness for A. catenella, optimized by the migrating abilities of this species. (C) 2011 Elsevier B.V. All rights reserved.
PY 2011
PD NOV
SO Harmful Algae
SN 1568-9883
PU Elsevier Science Bv
VL 11
UT 000297872600008
BP 73
EP 80
DI 10.1016/j.hal.2011.08.002
ID 16699
ER

EF