FN Archimer Export Format
PT J
TI Unsuspected intraspecific variability in the toxin production, growth and morphology of the dinoflagellate Alexandrium pacificum R.W. Litaker (Group IV) blooming in a South Western Mediterranean marine ecosystem, Annaba Bay (Algeria)
BT 
AF Hadjadji, Imen
   Laabir, Mohamed
   Frihi, Hocine
   Collos, Yves
   Shao, Zhao Jun
   Berrebi, Patrick
   Abadie, Eric
   Amzil, Zouher
   Chomérat, Nicolas
   Rolland, Jean-Luc
   Rieuvilleneuve, Fabien
   Masseret, Estelle
AS 1:1,7;2:7;3:1;4:8;5:3;6:3;7:2;8:4;9:5;10:6;11:7;12:7;
FF 1:;2:;3:;4:;5:;6:;7:PDG-ODE-LITTORAL-LERLR;8:PDG-ODE-DYNECO-PHYC;9:PDG-ODE-LITTORAL-LERBO;10:PDG-RBE-MARBEC;11:;12:;
C1 Laboratoire « Bioressources marines », Université Badji-Mokhtar-Annaba, BP 12, El-Hadjar, 23000, Annaba, Algeria
   Univ Montpellier, MARBEC, UMR 9190, IRD, CNRS, IFREMER, F-34095 Montpellier, France
   Univ Montpellier, CNRS, ISEM, IRD, EPHE, Montpellier, France Montpellier, CC065, Place E. Bataillon, 34095, Montpellier, Cedex 5, France
   Laboratoire Environnement, Microbiologie et Phycotoxines, Ifremer, Rue de l’Ile d’Yeu BP 21105, Nantes, CEDEX 3 44311, France
   IFREMER, Laboratoire Environnement et Ressources Bretagne Occidentale, Station de Biologie Marine, Place de la Croix, 29900, Concarneau, France
   IHPE, Université de Montpellier, CNRS, Ifremer, UPVD, Montpellier, France
   Univ Montpellier, MARBEC, UMR 9190, IRD, CNRS, IFREMER, F-34095 Montpellier, France
   Univ Montpellier, MARBEC, UMR 9190, IRD, CNRS, IFREMER, F-34095 Montpellier, France
C2 UNIV BADJI MOKHTAR ANNABA, ALGERIA
   IFREMER, FRANCE
   UNIV MONTPELLIER, FRANCE
   IFREMER, FRANCE
   IFREMER, FRANCE
   IFREMER, FRANCE
   UNIV MONTPELLIER, FRANCE
   CNRS, FRANCE
SI SETE
   NANTES
   CONCARNEAU
SE PDG-ODE-LITTORAL-LERLR
   PDG-ODE-DYNECO-PHYC
   PDG-ODE-LITTORAL-LERBO
   PDG-RBE-MARBEC
UM MARBEC
   IHPE
IN WOS Ifremer UPR
   WOS Ifremer UMR
   WOS Cotutelle UMR
   copubli-france
   copubli-univ-france
   copubli-int-hors-europe
   copubli-sud
IF 3.033
TC 12
UR https://archimer.ifremer.fr/doc/00624/73620/73598.pdf
LA English
DT Article
DE ;Alexandrium pacificum;Mediterranean;Toxin profile;Growth;Intraspecific variability
AB Physiological plasticity gives HABs species the ability to respond to variations in the surrounding environment. The aim of this study was to examine morphological and physiological variability in Alexandrium pacificum R.W. Litaker (Group IV) (former Alexandrium catenella) blooming in Annaba bay, Algeria. Monoclonal cultures of up to 30 strains of this neurotoxic dinoflagellate were established by the germination of single resting cysts from the surface sediment of this southern Mediterranean marine ecosystem. Ribotyping confirmed formally for the first time that A. pacificum is developing in Eastern Algerian waters. Toxin analyses of A. pacificum strains revealed substantial intraspecific variability in both the profile and toxin amount. However, the toxin profile of most strains is characterized by the dominance of GTX6 (up to 96 mol %) which is the less toxic paralytic molecule. The toxin concentrations in the isolated strains varied widely between 3.8 and 30.82 fmol cell−1. We observed an important variation in the growth rate of the studied A. pacificum strains with values ranging from 0.05 to 0.33 d−1. The lag time of the studied strains varied widely and ranged from 4 to 20 days. The intraspecific diversity could be a response to the selection pressure which may be exerted by different environmental conditions over time and which can be genetically and in turn physiologically expressed. This study highlights, for the first time, that the sediment of a limited area holds an important diversity of A. pacificum cysts which give when germinate populations with noticeable physiological plasticity. Consequently, this diversified natural populations allow an exceptional adaptation to specific environmental conditions to outcompete local microalgae and to establish HABs which could explain why this dinoflagellate is successful and expanding worldwide. 
PY 2020
PD JUL
SO Toxicon
SN 0041-0101
PU Elsevier BV
VL 180
UT 000530851100010
BP 79
EP 88
DI 10.1016/j.toxicon.2020.04.005
ID 73620
ER

EF