FN Archimer Export Format
PT J
TI Assessment of the allelochemical activity of Ostreopsis cf. ovata and the ovatoxins towards competitive benthic microalgae
BT 
AF Ternon, Eva
   Pavaux, Anne-Sophie
   Peltekis, Alexandra
   Gemin, Marin-Pierre
   Jauzein, Cecile
   Bailleul, Benjamin
   Lemée, Rodolphe
   Thomas, Olivier P.
AS 1:1,2,3;2:2;3:4;4:5;5:6;6:4;7:2;8:1,7;
FF 1:;2:;3:;4:PDG-ODE-PHYTOX;5:PDG-ODE-DYNECO-PELAGOS;6:;7:;8:;
C1 OCA, IRD, Géoazur, CNRS, Université Côte d’Azur, 250 Rue Albert Einstein, 06560, Valbonne, France
   Laboratoire d’Océanographie de Villefranche, CNRS UMR7093, Sorbonne Universités, 06234, Villefranche sur Mer, France
   Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, 92093, USA
   Laboratoire de Biologie du Chloroplaste et Perception de la Lumière chez les Micro-algues, CNRS UMR7141, IBPC, Sorbonne Université, Paris, France
   Phycotoxins Laboratory, IFREMER, 44311, Nantes, France
   Centre de Brest, DYNECO PELAGOS, IFREMER, 29280, Plouzané, France
   Marine Biodiscovery, School of Chemistry and Ryan Institute, National University of Ireland Galway (NUI Galway), University Road, Galway, H91 TK33, Ireland
C2 UNIV COTE D'AZUR, FRANCE
   UNIV SORBONNE, FRANCE
   UNIV CALIF SAN DIEGO, USA
   UNIV SORBONNE, FRANCE
   IFREMER, FRANCE
   IFREMER, FRANCE
   UNIV NATL IRELAND, IRELAND
SI NANTES
   BREST
SE PDG-ODE-PHYTOX
   PDG-ODE-DYNECO-PELAGOS
IN WOS Ifremer UPR
   copubli-france
   copubli-europe
   copubli-univ-france
   copubli-int-hors-europe
IF 1.8
TC 5
UR https://archimer.ifremer.fr/doc/00752/86395/91726.pdf
LA English
DT Article
DE ;Ostreopsis cf;ovata;Allelochemistry;Competition;Ovatoxins;Metabolomics
AB Recurrent blooms of the toxic dinoflagellate Ostreopsis cf. ovata are frequently reported in the Northwestern Mediterranean Sea. The impact of these proliferations on other microalgal species inhabiting the same habitats is of interest from an ecological prospective. In vitro experiments were carried out to investigate the influence of O. cf. ovata on the growth of the co-occurring benthic diatoms Licmophora paradoxa, Navicula arenaria and the benthic dinoflagellates Prorocentrum lima and Coolia monotis. Overall, O. cf. ovata exhibited weak allelopathic effects towards these microalgal species, with a reduction in the cell abundance for L. paradoxa and P. lima only. Interestingly, dead cells of L. paradoxa and N. arenaria were observed embedded in the thick mucus surrounding O. cf. ovata cells, suggesting that the mucous layer could act as a toxic phycosphere, especially for non-motile cells. All competitors were further exposed for 24 h to ovatoxins, the major toxins produced by O. cf. ovata, and the maximum quantum yield efficiency of L. paradoxa, N. arenaria and P. lima was affected at a minimum concentration of 10 µg mL−1. We then hypothesized that the diffusion of solubilized ovatoxins in the culture medium affects only moderately the competitors’ growth, whereas their accumulation in the mucus would yield deleterious effects. More precisely, the competitors’ sensitivity to ovatoxins was enhanced in their stationary phase of growth and resulted from a rapid inhibition of an uncharacterized photosynthetic step downstream photosystem II. Altogether, these results emphasize the predominant role of the O. cf. ovata’s mucus in driving ecological interactions and suggest that it can affect the growth of several benthic microalgae by accumulating the potent ovatoxins. 
PY 2022
PD JUL
SO Aquatic Ecology
SN 1386-2588
PU Springer Science and Business Media LLC
VL 56
IS 2
UT 000755474400001
BP 475
EP 491
DI 10.1007/s10452-022-09953-x
ID 86395
ER

EF