FN Archimer Export Format
PT J
TI The significance of organic nutrients in the nutrition of Pseudo-nitzschia delicatissima (Bacillariophyceae)
BT 
AF LOUREIRO, Sofia
   JAUZEIN, Cecile
   GARCES, Esther
   COLLOS, Yves
   CAMP, Jordi
   VAQUE, Dolors
AS 1:1;2:2;3:1;4:2;5:1;6:1;
FF 1:;2:PDG-DOP-LER-LERLR;3:;4:;5:;6:;
C1 Inst Ciencias Mar, Dept Biol Marina Oceanog 1, ICM CSIC, Barcelona 08003, Catalonia, Spain.
   Univ Montpellier 2, CNRS, IFREMER, Lab Ecosyst Lagunaires UMR 5119,CC093, F-34095 Montpellier 5, France.
C2 INST CIENCIAS MAR, SPAIN
   UNIV MONTPELLIER, FRANCE
   IFREMER, FRANCE
SI SETE
SE PDG-DOP-LER-LERLR
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-europe
   copubli-univ-france
IF 1.612
TC 41
UR https://archimer.ifremer.fr/doc/2009/publication-6438.pdf
LA English
DT Article
DE ;Harmful Algal Blooms (HABs);Nitrogen Uptake;Urea;Dissolved Organic Matter (DOM)
AB The influence of organic nutrients on the evolution of Pseudo-nitzschia delicatissima cultures was investigated in an enrichment experiment with high-molecular-weight dissolved organic matter (HMWDOM) and in an uptake assay with N-15-ammonium and N-15-urea. HMWDOM was extracted from seawater collected at a nearby shore station during the decline of a diatom bloom. Four incubations were prepared: L1/5+DOM (P. delicatissima grown in L1 growth medium with 1/5 of the nitrate concentration of standard L1), (L1-N)+DOM (L1 without nitrate, i.e. nitrogen-deficient treatment), L1-DOM (control culture without added DOM) and BV+DOM (bacterial and viral control, free of microalgae). Incubations were carried out for 10 days. Chlorophyll a concentrations differed after day 4 and reached higher levels in the L1-DOM incubation by the end of the experiment; however, similar growth rates were observed in all incubations (1.64 +/- 0.05 divisions day(-1)). The persistently lower cellular chlorophyll content in (L1-N)+DOM during the experiment was consistent with N limitation conditions. The data suggested that the nitrogen needed for the growth of (L1-N)+DOM cells might have originated from the DOM. Based on the results of N-15 uptake assays, it was concluded that P. delicatissima more readily acquires ammonium than urea. Nevertheless, under low N conditions, P. delicatissima may use urea as an alternative N source, and comparable photosynthetic rates are attained on either substrate. Taken together, our results suggest a positive effect of organic nutrients on the growth of P. delicatissima.
PY 2009
PD APR
SO Journal of plankton research
SN 0142-7873
PU Oxford university press
VL 31
IS 4
UT 000263962900005
BP 399
EP 410
DI 10.1093/plankt/fbn122
ID 6438
ER

EF