FN Archimer Export Format
PT J
TI Uptake of dissolved inorganic and organic nitrogen by the benthic toxic dinoflagellate Ostreopsis cf. ovata
BT 
AF JAUZEIN, Cecile
   COUET, Douglas
   BLASCO, Thierry
   LEMEE, Rodolphe
AS 1:1,2;2:1;3:1;4:1;
FF 1:PDG-ODE-DYNECO-PELAGOS;2:;3:;4:;
C1 UPMC Univ Paris 06, Sorbonne Univ, INSU CNRS, Lab Oceanog Villefranche, Villefranche Sur Mer, France.
   IFREMER, Ctr Brest, DYNECO PELAGOS, F-29280 Plouzane, France.
C2 UNIV PARIS 06, FRANCE
   IFREMER, FRANCE
SI BREST
SE PDG-ODE-DYNECO-PELAGOS
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
IF 4.138
TC 28
UR https://archimer.ifremer.fr/doc/00382/49368/49840.pdf
LA English
DT Article
DE ;Uptake;Nitrogen;Dinoflagellate;Ostreopsis;Kinetics;Interactions
AB Environmental factors that shape dynamics of benthic toxic blooms are largely unknown. In particular, for the toxic dinoflagellate Ostreopsis cf. ovata, the importance of the availability of nutrients and the contribution of the inorganic and organic pools to growth need to be quantified in marine coastal environments. The present study aimed at characterizing N-uptake of dissolved inorganic and organic sources by O. cf. ovata cells, using the 15N-labelling technique. Experiments were conducted taking into account potential interactions between nutrient uptake systems as well as variations with the diel cycle. Uptake abilities of O. cf. ovata were parameterized for ammonium (NH4+), nitrate (NO3−) and N-urea, from the estimation of kinetic and inhibition parameters. In the range of 0 to 10 μmol N L−1, kinetic curves showed a clear preference pattern following the ranking NH4+ > NO3− > N-urea, where the preferential uptake of NH4+ relative to NO3− was accentuated by an inhibitory effect of NH4+ concentration on NO3− uptake capabilities. Conversely, under high nutrient concentrations, the preference for NH4+ relative to NO3− was largely reduced, probably because of the existence of a low-affinity high capacity inducible NO3− uptake system. Ability to take up nutrients in darkness could not be defined as a competitive advantage for O. cf. ovata. Species competitiveness can also be defined from nutrient uptake kinetic parameters. A strong affinity for NH4+ was observed for O. cf. ovata cells that may partly explain the success of this toxic species during the summer season in the Bay of Villefranche-sur-mer (France). 
PY 2017
PD MAY
SO Harmful Algae
SN 1568-9883
PU Elsevier Science Bv
VL 65
UT 000402445000002
BP 9
EP 18
DI 10.1016/j.hal.2017.04.005
ID 49368
ER

EF